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• maximum number of connections Squid

  - by Isaac

  I have a Squid proxy server that controls all internet traffic for my network. I need a way to stop users from downloading big files (say 50MB) in my network. I banned some famous ports (e.g. torrent) but some downloads are possible by HTTP port. Obviously I cannot ban port 80! A simple solution is limiting maxmimum number of the simultaneous connections for each IP (e.g. 3 connections). It's possible in Squid with this config: acl ACCOUNTSDEPT 192.168.5.0/24 acl limitusercon maxconn 3 http_access deny ACCOUNTSDEPT limitusercon But this solution has really bad impact in web browsing, because any smart browser get different parts of a website by several connections simultaneously to speedup web browsing. But if we have a maximum number of connections, the browsers will fail to get some parts and the website will be shown partially and some parts/images/frames will not be shown. So, can we limit maximum number of persist connections? I think this policy will works: Specify Maximum number of connections that is alive for 10 seconds But Number of simultaneous connections for every IP is unlimited But how can we implement this policy when Squid? With which config? UPDATE: artifex and Tom Newton offered using a bandwidth-limiting approach to fight against downloaders. But bandwidth-limiting in Squid has a shortcoming: It's static and cannot dynamically change. So a person has a limited bandwidth not matter how many people are using internet (maybe nobody!) Also, this solution cannot help to stop people from downloading. They still can download but in a lower speed. But if we find a way to terminate persist connections (or any connection that is alive more than a specific time), downloading big files will be almost impossible (always there is some way!)

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• C# sends SQL data 4 times less from one box than from another

  - by Bobb

  W2003, .NET 3.5, SQL 2008 I have prod and UAT app servers deployed in 2 different data centres. I have a C# app which reads text file, parse the text and sends the data to the SQL in bulk. SQL server is in US and the app servers are in London (but in different places). All POPs have dedicated network connections. There is no public internet involved. When the app runs on UAT server I can see in Perfmon that the Send byte/sec is x4 higher than from production server. My estimate is that one server outputs at 1 MB/s and the other at 250 KB/s rate. My suspicion immediately is that there is a router on one of the DCs which shapes traffic or does QoS limitation on traffice from London to US. However support and Windows team and networkig team all are saying that there are no differences in neither networking config on the 2 DCs nor NIC config on the 2 app server... How to find out why is the networking bottlneck is 4 times tighter in one place than in the other? What can I do about it?

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• Best Practise for Stopwatch in multi processors machine?

  - by Ahmed Said

  I found a good question for measuring function performance, and the answers recommend to use Stopwatch as follows Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed But is this valid if you are running under multi processors machine? the thread can be switched to another processor, can it? Also the same thing should be in Enviroment.TickCount. If the answer is yes should I wrap my code inside BeginThreadAffinity as follows Thread.BeginThreadAffinity(); Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed Thread.EndThreadAffinity(); P.S The switching can occur over the thread level not only the processor level, for example if the function is running in another thread so the system can switch it to another processor, if that happens, will the Stopwatch be valid after this switching? I am not using Stopwatch for perfromance measurement only but also to simulate timer function using Thread.Sleep (to prevent call overlapping)

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• Cisco 837 not passing UDP traffic properly (was: DNS query problem)

  - by TessellatingHeckler

  We have a setup of ADSL line - Cisco 837 ADSL router - Zyxel ZyWall 35 firewall/NAT - Switch - LAN. It has been fine for years, suddenly DNS resolution stopped working from the LAN to public DNS servers. No changes that I know of, so I can't revert anything. Current behaviour: DNS requests from the LAN using TCP show up in the oubound firewall log, in the Cisco debug log, in the dns-server-firewall, in tcpdump on the DNS server, the answer comes back, it works fine. DNS requests from the LAN using UDP show up in the outbound firewall log, in the Cisco debug log, but does NOT show in the dns-server-firewall, not in tcpdump on the DNS server, times out. DNS requests from the Cisco using UDP show up in the dns-server-firewall and in tcpdump on the DNS server, answer received, works fine. netcat connections to port 53 or a random port by TCP show up in the dns-server-firewall netcat connections to port 53 or a random port by UDP do not show up in the dns-server-firewall Summary: TCP seems fine throughought. UDP works from the Cisco over the ADSL, and it works from the LAN to the Cisco, but it doesn't seem to cross the Cisco 837 properly. Update: confirmed with netcat that any UDP traffic from the LAN is affected, not just traffic to port 53. Update: If I change the firewall's external IP to any other IP in the subnet, this starts working. When I put it back, it stops working. I now suspect it's an ISP issue (does that sound plausible?), and am removing the Cisco config.

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• Server configuration advice for new site that could get lots of traffic within 6m

  - by alchemical

  We're setting up a new web2.0 type site with elements of e-commerce. Budget is kind of tight. Due to the nature of the site and promotions, etc., we expect traffic could ramp up fairly quickly. Looking for advice for a good configuration to start with, we' looking to co-lo with CalPop in downtown LA. We've looked at Dell, ABMX.com, and got a quote from CalPop (they make their own servers as they also do managed hosting). Price range has been anywhere from about $1200-$3300 per server. We're thinking to start with a web server and db server, both with mirrored drives. It would be nice to stay under about 2k per server if possible. Min configuration for each would probably be a quad-core with 8GB Ram. Thinking to run Windows Server 2008 R2 (Web Edition?) and SQL Server 2008. Looking for advice on the best server configurations and/or brands that fit the budget, yet will allow us to smoothly scale as traffic increases. Reliability is also pretty important. Also wondering if a switch/router is necessary or useful to connect the two servers.

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• How to force certain traffic through GRE tunnel?

  - by wew

  Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ip add add 192.168.168.1/30 dev gre1 ip link set gre1 up iptables -t nat -A POSTROUTING -s 192.168.168.0/30 -j SNAT --to-source 222.x.x.x iptables -t nat -A PREROUTING -d 222.x.x.x -j DNAT --to-destination 192.168.168.2 Client (public internet is 115.x.x.x): iptunnel add gre1 mode gre local 115.x.x.x remote 222.x.x.x ttl 255 ip add add 192.168.168.2/30 dev gre1 ip link set gre1 up echo '100 tunnel' >> /etc/iproute2/rt_tables ip rule add from 192.168.168.0/30 table tunnel ip route add default via 192.168.168.1 table tunnel Until here, all seems going right. But then 1st question, how to use GRE tunnel as a default route? Client computer is still using 115.x.x.x interface as default. 2nd question, how to force only ICMP traffic to go through tunnel, and everything else go default interface? I try doing this in client computer: ip rule add fwmark 200 table tunnel iptables -t mangle -A OUTPUT -p udp -j MARK --set-mark 200 But after doing this, my ping program will timeout (if I not doing 2 command above, and using ping -I gre1 ip instead, it will works). Later I want to do something else also, like only UDP port 53 through tunnel, etc. 3rd question, in client computer, I force one mysql program to listen on gre1 interface 192.168.168.2. In client computer, there's also one more public interface (IP 114.x.x.x)... How to forward traffic properly using iptables and route so mysql also respond a request coming from this 114.x.x.x public interface?

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• How to redirect all Internet traffic to OpenVPN Server

  - by JuliaS

  I have seen working solutions around the issue of forcing Internet traffic to go through the OpenVPN server but they are all done in Linux, all I want to know is how to add an entry to the route table in windows to make this happen. connectivity between the client and server is fine, my Windows 7 client can establish a connection to the Windows 2008 Server, but when established Internet traffic is still going from the local Windows 7 machine. Here are the details: Server: Windows 2008 Server with one NIC OpenVPN IP Address: 192.168.0.1 Local NIC IP Address (connects the server to the Internet): 10.242.69.107 Client: Windows 7 with one NIC OpenVPN IP Address: 192.168.0.2 ISP allocated IP Address: 10.0.8.2 (gateway 10.0.8.1) Server OpenVPN Config: dev tun ifconfig 192.168.0.1 192.168.0.2 secret static.key push "redirect-gateway def1" Client OpenVPN Config: remote xxx.xxx.com dev tun ifconfig 192.168.0.2 192.168.0.1 secret static.key I'm not an expert with adding routes...etc. I would be grateful if someone could let me know how to add this entry in my server/client route table. EDIT: Output from the client's netstat -rnv IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.0.8.1 10.0.8.2 20 10.0.8.0 255.255.255.252 On-link 10.0.8.2 276 10.0.8.2 255.255.255.255 On-link 10.0.8.2 276 10.0.8.3 255.255.255.255 On-link 10.0.8.2 276 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.0.0 255.255.255.252 On-link 192.168.0.2 286 192.168.0.2 255.255.255.255 On-link 192.168.0.2 286 192.168.0.3 255.255.255.255 On-link 192.168.0.2 286 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 10.0.8.2 276 224.0.0.0 240.0.0.0 On-link 192.168.0.2 286 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 10.0.8.2 276 255.255.255.255 255.255.255.255 On-link 192.168.0.2 286 ===========================================================================

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• Network Traffic Log

  - by Chris Becke

  Background - On my "home" network I have a Linksys WTR45GL router providing my internet access as well as a wireless AP. Connected I have * 2 Windows PCs (wired) * At least one laptop (Wired) * Some 802.11 enabled handheld consoles (PSPs) * A Nintendo Wii * Some windows XP pcs used by the people in the granny flat. Where I live, South Africa, well, 1Gb worth of monthly cap is, while not expensive, costly enough that I'd like to be sure that all the bandwidth used by devices on my network is ... well ... legitimate and not the result of neighbors parasiting my wireless, malware or just the result of "liberal" download policies in my software. I got the Linksys WRT45GL on the understanding that there were custom firmwares (DD-WRT and Tomato) that allowed bandwidth tracking, but there doesn't seem to be any facility to get a log of traffic that can be examined to see (a) which local devices were the biggest consumers of bandwidth and (b) what they were connected to. What tools are there for logging traffic such that, when it gets to that OMG moment in the month when all my bandwidth is gone, I have a chance to find out what the hell used it all up (and hopefully attempt some corrective action).

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• Outside VPN traffic not able to ping site-to-site VPN remote site

  - by Siriss

  we have two ASA 5510s running 8.4 in a site-to-site VPN setup. All internal traffic is working smoothly. Site/Subnet A: 192.100.0.0 - local Site/Subnet B: 192.200.0.0 - remote VPN Users: 192.100.40.0 - assigned by ASA When you VPN into the network, all traffic hits Site A, and everything on subnet A is accessible. Site B however, is completely inaccessible for VPN users. All machines on subnet B, the firewall itself, etc... is not reachable by ping or otherwise. I know I am missing a NAT rule, and in 8.2, it was easy as pie to setup using ASDM, but now I can't get it for the life of me as 8.4 apparently made a lot of changes to NAT rules. I am not too comfortable in the ASA command line, but if there is a command I need to add or if you could direct me where I can add this in 8.4 ASDM I would really appreciate it. I have tired NAT Exempt, Static NAT, Static NAT Policies, etc... I think I tried all the options. I also might have my interfaces confused with the new look at feel of ASDM. Thank you much in advance and I hope I have been thorough enough.

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• Route traffic from one VPN to a second VPN

  - by Dominic

  I have set up an OpenVPN server on my windows 7 64-bit PC. I also have a subscription to a VPN service. My aim is to be able to connect my android phone to the VPN server on my PC, and then route all traffic through the VPN service. I have a NetGear WPN824 router. I can get it working if I my phone is on my local network. Then I can connect my phone to the VPN server using the local IP address of my PC. In Network Connection in the control panel, I share the connection used by the VPN service with the connection used by the VPN server. Then when I browse the internet on my phone, all traffic goes through the VPN service. Very nice. But if my phone is outside my local network, so I have to connect my phone to the local VPN using my PC's external IP address, then this method doesn't work. If I connect my PC to the VPN service and then try to connect my phone to my own VPN, it just doesn't connect (the initial TLS handshake times out). If I connect my phone to the local VPN first, then this connection is lost as soon as I connect my PC to the VPN service. Does anybody know how I can get this working? Many thanks Dominic

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• Route all traffic via OpenVPN client

  - by Ilya

  I've got OpenVPN client running on 192.168.0.3. What I'd like to do is route all the traffic from the second computer with 192.168.0.100 via OpenVPN client that's running on the first computer. My router ip is 192.168.0.1 Network topology: Windows computer with OpenVPN client: 192.168.0.3 Windows computer whose traffic has to be rerouted: 192.168.0.100 Router: 192.168.0.1 I want it to work in the following way: 192.168.0.100 computer => 192.168.0.3 computer => OpenVPN => 192.168.0.1 How can I achieve that by only modifying windows' routing table? I've tried entering the following into windows shell(on computer without VPN), which didn't work (it just dropped my internet connection): route delete 0.0.0.0 mask 255.255.255.255 192.168.0.1 route add 0.0.0.0 mask 255.255.255.255 192.168.0.3 Should I also setup the computer that has OpenVPN client running? Does it have anything to do with windows tcp forwarding? Thanks!

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• Force local IP traffic to an external interface

  - by calandoa

  I have a machine with several interfaces that I can configure as I want, for instance: eth1: 192.168.1.1 eth2: 192.168.2.2 I would like to forward all the traffic sent to one of these local addresses through the other interface. For instance, all requests to an iperf, ftp, http server at 192.168.1.1 should be not just routed internally, but forwarded through eth2 (and the external network will take care of re-routing the packet to eth1). I tried and looked at several commands, like iptables, ip route, etc... but nothing worked. The closest behavior I could get was done with: ip route change to 192.168.1.1/24 dev eth2 which send all 192.168.1.x on eth2, except for 192.168.1.1 which is still routed internally. May be I could then do NAT forwarding of all traffic directed to fake 192.168.1.2 on eth1, rerouted to 192.168.1.1 internally? I am actually struggling with iptables, but it is too tough for me. The goal of this setup is to do interface driver testing without using two PCs. I am using Linux, but if you know how to do that with Windows, I'll buy it!

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• IP Blacklists and suspicious inbound and outbound traffic

  - by Pantelis Sopasakis

  I administer a web server and recently we had our IP banned (!) from our host after they received a notification e-mail for abuse. In particular our server is allegedly involved in spam attacks over HTTP. The content of the abuse report email we received was not much informative - for example the IP addresses our server is supposed to have attacked against are not included - so I started a wireshark session checking for suspicious traffic over TCP/HTTP while trying to locate possible security holes on the system. (Let me note that the machine runs a Debian OS). Here is an example of such a request... Source: 89.74.188.233 Destination: 12.34.56.78 // my ip Protocol: HTTP Info: GET 'http://www.media.apniworld.com/image.php?type=hv' HTTP/1.0 I manually blacklisted this host (as well as some other ones) blocking them with iptables, but I can't keep on doing manually all day long... I'm looking for an automated way to block such IPs based on: Statistical analysis, pattern recognition or other AI-based analysis (Though, I'm reluctant to trust such a solution, if exists) Public blacklists Using DNSBL I actually found out that 89.74.188.233 is blacklisted. However other IPs which are strongly suspicious like 93.199.112.126 (i.e. http://www.pornstarnetwork.com/account/signin), unfortunately were not blacklisted! What I would like to do is to automatically connect my firewall with DNSBL (or some other blacklist database) and block all traffic towards blacklisted IPs or somehow have my local blacklist automatically updated.

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• Route all wlan0 traffic over tun0

  - by Tuinslak

  I'm looking for a way to route all wlan0 traffic (tcp and udp) over tun0 (openvpn). However, all other traffic originating from the device itself should not be routed through tun0. I'm guessing this could be realized using iptables or route, but none of my options seem to work. # route add -net 0.0.0.0 gw 172.27.0.1 dev wlan0 SIOCADDRT: No such process Info: This is because the VPN server is not redundant, and wlan users are not really important. However, all services running on the device are fairly important and having a VPN virtual machine with no SLA on it is just a bad idea. Trying to minimize the odds of something going wrong. So setting the VPN server as default gateway is not really an option. I also want all wlan0 user to use the VPN server's IP address as external IP. Edit with the script provided: root@ft-genesi-xxx ~ # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 172.27.0.17 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.13.37.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0 172.27.0.0 172.27.0.17 255.255.192.0 UG 0 0 0 tun0 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 root@ft-genesi-xxx ~ # ./test.sh RTNETLINK answers: No such process root@ft-genesi-xxx ~ # cat test.sh #!/bin/sh IP=/sbin/ip # replace with the range of your wlan network, or use fwmark instead ${IP} rule add from 10.13.37.0/24 table from-wlan ${IP} route add default dev tun0 via 127.72.0.1 table from-wlan ${IP} route add 10.13.37.0/24 dev wlan0 table from-wlan

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• Route return traffic to correct gateway depending on service

  - by Marnix van Valen

  On my office network I have two internet connections and one CentOS server running a website (HTTPS on port 443). The website should be publicly accessible through the public IP of the first internet connection (ISP-1). The other internet connection, ISP-2, id the default gateway on the network. Both internet connections have routers (the household-kind) with NAT, SPI firewalls etc. The router on ISP-2 is a Netgear WNDR3700 (aka N600) with original firmware. The problem is that the website is unreachable. Looks like incoming traffic on ISP-1 will reach the server but the returning traffic is routed through ISP-2, effectively making the site unreachable. As far as I can tell I can't do port based routing on the WNDR3700. What are my options to make this work? I've been looking at implementing an iptables / routing based solution on the server itself but haven't been able to make that work. Update: Note that the server has one network interface connecting it to both routers.

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• Cisco PIX 515 doesn't seem to be passing traffic through according to static route

  - by Liquidkristal

  Ok, so I am having a spot of bother with a Cisco PIX515, I have posted the current running config below, now I am no cisco expert by any means although I can do basic stuff with them, now I am having trouble with traffic sent from the outside to address: 10.75.32.25 it just doesn't appear to be going anywhere. Now this firewall is deep inside a private network, with an upstream firewall that we don't manage. I have spoken to the people that look after that firewall and they say they they have traffic routing to 10.75.32.21 and 10.75.32.25 and thats it (although there is a website that runs from the server 172.16.102.5 which (if my understanding is correct) gets traffic via 10.75.32.23. Any ideas would be greatly appreciated as to me it should all just work, but its not (obviously if the config is all correct then there could be a problem with the web server that we are trying to access on 10.75.32.25, although the users say that they can get to it internally (172.16.102.8) which is even more confusing) PIX Version 6.3(3) interface ethernet0 auto interface ethernet1 auto interface ethernet2 auto nameif ethernet0 outside security0 nameif ethernet1 inside security100 nameif ethernet2 academic security50 fixup protocol dns maximum-length 512 fixup protocol ftp 21 fixup protocol h323 h225 1720 fixup protocol h323 ras 1718-1719 fixup protocol http 80 fixup protocol rsh 514 fixup protocol rtsp 554 fixup protocol sip 5060 fixup protocol sip udp 5060 fixup protocol skinny 2000 fixup protocol smtp 25 fixup protocol sqlnet 1521 fixup protocol tftp 69 names name 195.157.180.168 outsideNET name 195.157.180.170 globalNAT name 195.157.180.174 gateway name 195.157.180.173 Mail-Global name 172.30.31.240 Mail-Local name 10.75.32.20 outsideIF name 82.219.210.17 frogman1 name 212.69.230.79 frogman2 name 78.105.118.9 frogman3 name 172.16.0.0 acadNET name 172.16.100.254 acadIF access-list acl_outside permit icmp any any echo-reply access-list acl_outside permit icmp any any unreachable access-list acl_outside permit icmp any any time-exceeded access-list acl_outside permit tcp any host 10.75.32.22 eq smtp access-list acl_outside permit tcp any host 10.75.32.22 eq 8383 access-list acl_outside permit tcp any host 10.75.32.22 eq 8385 access-list acl_outside permit tcp any host 10.75.32.22 eq 8484 access-list acl_outside permit tcp any host 10.75.32.22 eq 8485 access-list acl_outside permit ip any host 10.75.32.30 access-list acl_outside permit tcp any host 10.75.32.25 eq https access-list acl_outside permit tcp any host 10.75.32.25 eq www access-list acl_outside permit tcp any host 10.75.32.23 eq www access-list acl_outside permit tcp any host 10.75.32.23 eq https access-list acl_outside permit tcp host frogman1 host 10.75.32.23 eq ssh access-list acl_outside permit tcp host frogman2 host 10.75.32.23 eq ssh access-list acl_outside permit tcp host frogman3 host 10.75.32.23 eq ssh access-list acl_outside permit tcp any host 10.75.32.23 eq 2001 access-list acl_outside permit tcp host frogman1 host 10.75.32.24 eq 8441 access-list acl_outside permit tcp host frogman2 host 10.75.32.24 eq 8441 access-list acl_outside permit tcp host frogman3 host 10.75.32.24 eq 8441 access-list acl_outside permit tcp host frogman1 host 10.75.32.24 eq 8442 access-list acl_outside permit tcp host frogman2 host 10.75.32.24 eq 8442 access-list acl_outside permit tcp host frogman3 host 10.75.32.24 eq 8442 access-list acl_outside permit tcp host frogman1 host 10.75.32.24 eq 8443 access-list acl_outside permit tcp host frogman2 host 10.75.32.24 eq 8443 access-list acl_outside permit tcp host frogman3 host 10.75.32.24 eq 8443 access-list acl_outside permit tcp any host 10.75.32.23 eq smtp access-list acl_outside permit tcp any host 10.75.32.23 eq ssh access-list acl_outside permit tcp any host 10.75.32.24 eq ssh access-list acl_acad permit icmp any any echo-reply access-list acl_acad permit icmp any any unreachable access-list acl_acad permit icmp any any time-exceeded access-list acl_acad permit tcp any 10.0.0.0 255.0.0.0 eq www access-list acl_acad deny tcp any any eq www access-list acl_acad permit tcp any 10.0.0.0 255.0.0.0 eq https access-list acl_acad permit tcp any 10.0.0.0 255.0.0.0 eq 8080 access-list acl_acad permit tcp host 172.16.102.5 host 10.64.1.115 eq smtp pager lines 24 logging console debugging mtu outside 1500 mtu inside 1500 mtu academic 1500 ip address outside outsideIF 255.255.252.0 no ip address inside ip address academic acadIF 255.255.0.0 ip audit info action alarm ip audit attack action alarm pdm history enable arp timeout 14400 global (outside) 1 10.75.32.21 nat (academic) 1 acadNET 255.255.0.0 0 0 static (academic,outside) 10.75.32.22 Mail-Local netmask 255.255.255.255 0 0 static (academic,outside) 10.75.32.30 172.30.30.36 netmask 255.255.255.255 0 0 static (academic,outside) 10.75.32.23 172.16.102.5 netmask 255.255.255.255 0 0 static (academic,outside) 10.75.32.24 172.16.102.6 netmask 255.255.255.255 0 0 static (academic,outside) 10.75.32.25 172.16.102.8 netmask 255.255.255.255 0 0 access-group acl_outside in interface outside access-group acl_acad in interface academic route outside 0.0.0.0 0.0.0.0 10.75.32.1 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00 timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00 timeout uauth 0:05:00 absolute aaa-server TACACS+ protocol tacacs+ aaa-server RADIUS protocol radius aaa-server LOCAL protocol local snmp-server host outside 172.31.10.153 snmp-server host outside 172.31.10.154 snmp-server host outside 172.31.10.155 no snmp-server location no snmp-server contact snmp-server community CPQ_HHS no snmp-server enable traps floodguard enable telnet 172.30.31.0 255.255.255.0 academic telnet timeout 5 ssh timeout 5 console timeout 0 terminal width 120 Cryptochecksum:hi2u : end PIX515#

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• outgoing DNS flood targeted to non-ISP hosts

  - by radudani

  Below is the specific traffic monitored at the network perimeter and originating from a user PC on Vista platform. My question is not about the effects of the flood, but about the nature of the source of it. Is this some known infection, or just an application went out of control? a standard NOD32 scan didn't find anything, as the user told me. Thank you for any hint. 14:40:10.115876 IP 192.168.7.42.4122 > 67.228.0.181.53: S 2742536765:2742536765(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.115943 IP 192.168.7.42.4124 > 67.228.181.207.53: S 3071079888:3071079888(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116015 IP 192.168.7.42.4126 > 67.228.0.181.53: S 3445199428:3445199428(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116086 IP 192.168.7.42.4128 > 67.228.181.207.53: S 2053198691:2053198691(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116154 IP 192.168.7.42.4130 > 67.228.0.181.53: S 2841660872:2841660872(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116222 IP 192.168.7.42.4132 > 67.228.181.207.53: S 3150822465:3150822465(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116290 IP 192.168.7.42.4134 > 67.228.0.181.53: S 1692515021:1692515021(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116358 IP 192.168.7.42.4136 > 67.228.181.207.53: S 3358275919:3358275919(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116430 IP 192.168.7.42.4138 > 67.228.0.181.53: S 930184999:930184999(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116498 IP 192.168.7.42.4140 > 67.228.181.207.53: S 1504984630:1504984630(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116566 IP 192.168.7.42.4142 > 67.228.0.181.53: S 546074424:546074424(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116634 IP 192.168.7.42.4144 > 67.228.181.207.53: S 4241828590:4241828590(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116702 IP 192.168.7.42.4146 > 67.228.0.181.53: S 668634627:668634627(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.116769 IP 192.168.7.42.4148 > 67.228.181.207.53: S 3768119461:3768119461(0) win 16384 <mss 1460,nop,nop,sackOK> 14:40:10.117360 IP 192.168.7.42.4111 > 67.228.0.181.53: 12676 op8 Resp12*- [2128q][|domain] 14:40:10.117932 IP 192.168.7.42.4112 > 67.228.181.207.53: 44190 op7 NotAuth*|$ [29103q],[|domain] 14:40:10.118726 IP 192.168.7.42.4113 > 67.228.0.181.53: 49196 inv_q [b2&3=0xeea] [64081q] [28317a] [43054n] [23433au] Type63482 (Class 5889)? M-_^OS>M-JM-m^_M-i.[|domain] 14:40:10.119934 IP 192.168.7.42.4114 > 67.228.181.207.53: 48131 updateMA Resp12$ [43850q],[|domain] 14:40:10.121164 IP 192.168.7.42.4115 > 67.228.0.181.53: 46330 updateM% [b2&3=0x665b] [23691a] [998q] [32406n] [11452au][|domain] 14:40:10.121866 IP 192.168.7.42.4116 > 67.228.181.207.53: 34425 op7 YXRRSet* [39927q][|domain] 14:40:10.123107 IP 192.168.7.42.4117 > 67.228.0.181.53: 56536 notify+ [b2&3=0x27e6] [59761a] [23005q] [33341n] [29705au][|domain] 14:40:10.123961 IP 192.168.7.42.4118 > 67.228.181.207.53: 19323 stat% [b2&3=0x14bb] [32491a] [41925q] [2038n] [5857au][|domain] 14:40:10.132499 IP 192.168.7.42.4119 > 67.228.0.181.53: 50432 updateMA+ [b2&3=0x6bc2] [10733a] [9775q] [46984n] [15261au][|domain] 14:40:10.133394 IP 192.168.7.42.4120 > 67.228.181.207.53: 2171 notify Refused$ [26027q][|domain] 14:40:10.134421 IP 192.168.7.42.4121 > 67.228.0.181.53: 25802 updateM NXDomain*-$ [28641q][|domain] 14:40:10.135392 IP 192.168.7.42.4122 > 67.228.181.207.53: 2073 updateMA+ [b2&3=0x6d0b] [43177a] [54332q] [17736n] [43636au][|domain] 14:40:10.136638 IP 192.168.7.42.4123 > 67.228.0.181.53: 15346 updateD+% [b2&3=0x577a] [61686a] [19106q] [15824n] [37833au] Type28590 (Class 64856)? [|domain] 14:40:10.137265 IP 192.168.7.42.4124 > 67.228.181.207.53: 60761 update+ [b2&3=0x2b66] [43293a] [53922q] [23115n] [11349au][|domain] 14:40:10.148122 IP 192.168.7.42.4125 > 67.228.0.181.53: 3418 op3% [b2&3=0x1a92] [51107a] [60368q] [47777n] [56081au][|domain]

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• Can't capture https traffic with Fiddler and Firefox (works with IE)

  - by Tony_Henrich

  I am trying to debug an asp.net app using Firefox. Firefox tries to connect to https://www.paypal.com and I get "Secure Connection Failed" error (Error code: sec_error_bad_signature). I installed Fiddler's cert in Firefox and the local computer and current user Cert stores. I set up the manual proxy in FF to 127.0.0.1 and port 8888 and for all protocols. Fiddler captures http traffic but gives an error with https traffic. Fiddler captures https from IE fine. What's the problem? (Is FiddlerHook FF extension needed and what setting should it be using: auto, disabled or Force traffic to Fiddler?)

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• SMB2 traffic crashes network?

  - by Phil Cross

  We've been having significant network slowdown issues over the past few weeks, primarily on a Friday morning. We run Windows 7 client machines, with Windows Server 2008 R2 servers. What generally happens is the network starts to slow down massively at 08:55 and resumes normal speeds at around 09:20 This affects everything on the network from logging on, resetting passwords, opening programs and files etc. On my client machine, Physical Memory usage remains at around 40% (normal) and CPU usage hovers around 0-10% idle. The servers show memory usage spikes massively and remains quite intense during the times mentioned above. I have taken several wireshark captures, both during the slowdown and when the network operates fine. One of the main things I noticed is the increase in SMB2 entries in the wireshark log during the slowdown. Record Time Source Destination Protocol Length Info 382 3.976460000 10.47.35.11 10.47.32.3 SMB2 362 Create Request File: pcross\My Documents 413 4.525047000 10.47.35.11 10.47.32.3 SMB2 146 Close Request File: pcross\My Documents 441 5.235927000 10.47.32.3 10.47.35.11 SMB2 298 Create Response File: pcross\My Documents\Downloads 442 5.236199000 10.47.35.11 10.47.32.3 SMB2 260 Find Request File: pcross\My Documents\Downloads SMB2_FIND_ID_BOTH_DIRECTORY_INFO Pattern: *;Find Request File: pcross\My Documents\Downloads SMB2_FIND_ID_BOTH_DIRECTORY_INFO Pattern: * 573 6.327634000 10.47.35.11 10.47.32.3 SMB2 146 Close Request File: pcross\My Documents\Downloads 703 7.664186000 10.47.35.11 10.47.32.3 SMB2 394 Create Request File: pcross\My Documents\Downloads\WestlandsProspectus\P24 __ P21.pdf These are some of the SMB2 records from a list of a couple of hundred which original from my computer with a destination of the fileserver. One of the interesting things to note is the last entry in the examples above is for a PDF file. That file was not open anywhere on my computer, or on anyone elses. No folders with the files in were open either. When I took another capture when the network was running fine, there were hardly any SMB2 entries, and the ones that were displayed were mainly from Wireshark. We currently have around 800 computers, 90 Macs and 200 Laptops and Netbooks. Our concern is if this traffic is happening on my computer, is it happening on other computers, and if so, would those computers be adding to the slow network issues? Again, this only happens during certain times. We're pretty sure its not the our antivirus. Is there anything to narrow down whats initializing this SMB traffic during the particular times? Or if anyone has any extra advice, or links to resources it would be appreciate.

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• Creating static NAT blocks outbound traffic Cisco ASA

  - by natediggs

  Hi Everyone, I have two web servers sitting behind a Cisco ASA 5505, which I don't have much experience with. I'm trying to create two static NATs. One static NAT that goes to xx.xx.xx.150 and another that goes to xx.xx.xx.151. I've created the static NAT for the .150 web server and it works FINE. Incoming and outgoing traffic work great. This is the staging web server. I now need to duplicate the setup for the production web server. So, I connect the webserver to the firewall, change the public IP address on one of the NICs reboot the server and I have outbound internet access. Then I run the command: static (inside,outside) xx.xx.xx.150 192.168.1.x which is successful. I then run the command: access-list acl-outside permit tcp any host xx.xx.xx.150 eq 80 Which is successful. I then try to browse the internet and I get nothing. I try to telnet in through port 80 and I get nothing (though I'm guessing because the response to the telnet request is being blocked). I've tried this with the production web server and then I tried it with another web server that is for internal testing and have the exact same problem. Both work fine until I run the static NAT rule and then no outbound internet access. I have a feeling that it's something simple that I'm missing, but my limited experience with this device is killing me. Below I've pasted the current configuration. I'm currently trying to get this to work on the .153 server which is the internal testing server. Once I can verify that works, I'll try it with production. : Saved : ASA Version 8.2(4) ! hostname QG domain-name XX.com enable password passwd names ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! interface Ethernet0/2 ! interface Ethernet0/3 ! interface Ethernet0/4 ! interface Ethernet0/5 ! interface Ethernet0/6 ! interface Ethernet0/7 ! interface Vlan1 nameif inside security-level 100 ip address 192.168.1.1 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 ip address XX.XX.XX.148 255.255.255.0 ! interface Vlan3 shutdown no forward interface Vlan1 nameif dmz security-level 50 ip address dhcp ! boot system disk0:/asa824.bin ftp mode passive clock timezone EST -5 clock summer-time EDT recurring dns server-group DefaultDNS domain-name fw.XXgroup.com same-security-traffic permit inter-interface access-list acl-outside extended permit tcp any host XX.XX.XX.150 eq www access-list acl-outside extended permit tcp any host XX.XX.XX.150 eq https access-list acl-outside extended permit tcp any host XX.XX.XX.151 eq www access-list acl-outside extended permit tcp any host XX.XX.XX.151 eq https access-list acl-outside extended permit tcp any host XX.XX.XX.153 eq www access-list inside_access_in extended permit ip 192.168.1.0 255.255.255.0 any access-list inside_nat0_outbound extended permit ip any 192.168.1.32 255.255.255.240 pager lines 24 logging enable logging asdm informational mtu inside 1500 mtu outside 1500 mtu dmz 1500 ip local pool VPNIPs 192.168.1.35-192.168.1.44 mask 255.255.255.0 icmp unreachable rate-limit 1 burst-size 1 asdm image disk0:/asdm-635.bin no asdm history enable arp timeout 14400 global (outside) 1 interface nat (inside) 0 access-list inside_nat0_outbound nat (inside) 1 0.0.0.0 0.0.0.0 static (inside,outside) XX.XX.XX150 192.168.1.100 netmask 255.255.255.255 static (inside,outside) XX.XX.XX153 192.168.1.102 netmask 255.255.255.255 access-group acl-outside in interface outside route outside 0.0.0.0 0.0.0.0 XX.XX.XX129 1 timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute timeout tcp-proxy-reassembly 0:01:00 dynamic-access-policy-record DfltAccessPolicy aaa authorization command LOCAL http server enable http 192.168.1.0 255.255.255.0 inside http 0.0.0.0 0.0.0.0 outside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac crypto ipsec security-association lifetime seconds 28800 crypto ipsec security-association lifetime kilobytes 4608000 crypto dynamic-map outside_dyn_map 20 set pfs group1 crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-SHA crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map crypto map outside_map interface outside crypto isakmp enable outside crypto isakmp policy 10 authentication crack encryption 3des hash sha group 2 lifetime 86400 no crypto isakmp nat-traversal client-update enable telnet timeout 5 ssh timeout 5 console timeout 0 dhcpd auto_config outside ! dhcpd address 192.168.1.2-192.168.1.33 inside dhcpd dns 208.77.88.4 interface inside dhcpd enable inside ! threat-detection basic-threat threat-detection statistics access-list no threat-detection statistics tcp-intercept webvpn enable outside svc image disk0:/sslclient-win-1.1.0.154.pkg 1 svc image disk0:/anyconnect-win-2.5.2019-k9.pkg 2 svc enable group-policy ATSAdmin internal group-policy ATSAdmin attributes dns-server value 208.77.88.4 208.85.174.9 vpn-tunnel-protocol IPSec svc webvpn webvpn url-list none svc keep-installer installed svc rekey method ssl svc ask enable username qgadmin password /oHfeGQ/R.bd3KPR encrypted privilege 15 username benl password 0HNIGQNI0uruJvhW encrypted privilege 0 username benl attributes vpn-group-policy ATSAdmin username kuzma password rH7MM7laoynyvf9U encrypted privilege 0 username kuzma attributes vpn-group-policy ATSAdmin username nate password BXHOURyT37e4O5mt encrypted privilege 0 username nate attributes vpn-group-policy ATSAdmin tunnel-group ATSAdmin type remote-access tunnel-group ATSAdmin general-attributes address-pool VPNIPs default-group-policy ATSAdmin tunnel-group SSLVPN type remote-access tunnel-group SSLVPN general-attributes address-pool VPNIPs default-group-policy ATSAdmin ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect esmtp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp inspect ip-options ! service-policy global_policy global privilege cmd level 3 mode exec command perfmon privilege cmd level 3 mode exec command ping privilege cmd level 3 mode exec command who privilege cmd level 3 mode exec command logging privilege cmd level 3 mode exec command failover privilege show level 5 mode exec command running-config privilege show level 3 mode exec command reload privilege show level 3 mode exec command mode privilege show level 3 mode exec command firewall privilege show level 3 mode exec command interface privilege show level 3 mode exec command clock privilege show level 3 mode exec command dns-hosts privilege show level 3 mode exec command access-list privilege show level 3 mode exec command logging privilege show level 3 mode exec command ip privilege show level 3 mode exec command failover privilege show level 3 mode exec command asdm privilege show level 3 mode exec command arp privilege show level 3 mode exec command route privilege show level 3 mode exec command ospf privilege show level 3 mode exec command aaa-server privilege show level 3 mode exec command aaa privilege show level 3 mode exec command crypto privilege show level 3 mode exec command vpn-sessiondb privilege show level 3 mode exec command ssh privilege show level 3 mode exec command dhcpd privilege show level 3 mode exec command vpn privilege show level 3 mode exec command blocks privilege show level 3 mode exec command uauth privilege show level 3 mode configure command interface privilege show level 3 mode configure command clock privilege show level 3 mode configure command access-list privilege show level 3 mode configure command logging privilege show level 3 mode configure command ip privilege show level 3 mode configure command failover privilege show level 5 mode configure command asdm privilege show level 3 mode configure command arp privilege show level 3 mode configure command route privilege show level 3 mode configure command aaa-server privilege show level 3 mode configure command aaa privilege show level 3 mode configure command crypto privilege show level 3 mode configure command ssh privilege show level 3 mode configure command dhcpd privilege show level 5 mode configure command privilege privilege clear level 3 mode exec command dns-hosts privilege clear level 3 mode exec command logging privilege clear level 3 mode exec command arp privilege clear level 3 mode exec command aaa-server privilege clear level 3 mode exec command crypto privilege cmd level 3 mode configure command failover privilege clear level 3 mode configure command logging privilege clear level 3 mode configure command arp privilege clear level 3 mode configure command crypto privilege clear level 3 mode configure command aaa-server prompt hostname context call-home profile CiscoTAC-1 no active destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService destination address email [email protected] destination transport-method http subscribe-to-alert-group diagnostic subscribe-to-alert-group environment subscribe-to-alert-group inventory periodic monthly subscribe-to-alert-group configuration periodic monthly subscribe-to-alert-group telemetry periodic daily Cryptochecksum:0ed0580e151af288d865f4f3603d792a : end asdm image disk0:/asdm-635.bin no asdm history enable

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• Cloning/copying traffic from production web cluster to test web cluster

  - by Marko Kevac

  Hello. We have 10 machine web cluster with approximately 1500 req/seq. How can we copy/clone all user traffic that comes to this production cluster in order to test new version of software, which is installed on a little bit smaller test cluster? It should be copy, not load balancing, i.e. real users must receive answer from production cluster, not testing one. OS: Linux Thanks.

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• Block all but http traffic on a network interface

  - by Oli

  I've got two network interfaces on an Ubuntu machine which go out to two different networks but both have internet gateways. I need to limit it so that any outgoing http requests it makes (ie through wget) only go through eth0 and all other traffic goes through eth1. I dare say the solution might have something to do with iptables but I've no experience with it so would appreciate all help.

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• Set up DNS or F5 VIP to send traffic to a specific port

  - by Sam

  I have a clustered SQL instance set up at SERVER01\dev08 It's assigned to a static port of 1466. Can I set up something which will let users connect to SERVER01 and hit that port? If this is possible, what problems might it create (all traffic coming to this name hitting only one port)? It seems that DNS has nothing to do with ports - nor does the F5 big IP.

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• Routers with decent parental monitoring / traffic logging?

  - by antiver

  I'm looking for consumer router / firmware recommendations with reasonably robust remote URL / hostname logging & reporting functionality. Most logging functionality I've seen is terrible - reporting only IP addresses, not rolling up reports or reporting any useful statistics. The logs are also often limited to merely the last few minutes/hours when handling high-traffic loads. Bonus points for providing a screenshot of the log reporting interface!

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• Using iptables to forward traffic destined for specific ip via specific interface

  - by shapeshifter

  I want to forward traffic destined for a specific ip from my internal network via a specific interface. I have two interfaces which are currently load balanced. I need all requests for a certain ip to go out via eth0 otherwise my external ip changes and sessions are dropped. eg. all requests from 10.1.1.1/24 to ip 11.22.33.44 on port 443 must go out via interface eth0. How can I do this with iptables?

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