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  • DansGuardian/Squid Traffic doesn't get back to user

    - by DKNUCKLES
    I've purchased a Squid appliance that I'm attempting to implement, however the lack of documentation has left me a bit high and dry. Forgive me if this is a silly question, but this is my first attempt at implementing Squid. From what I can ascertain from the documentation (or lack thereof), the users connect to DansGuardian first at port 8080 where the filtering is done, at which point it forwards it to the Squid appliance at port 3128. The traffic is then sent to the internet. The setup I have is as follows Gateway (MikroTik router) : 192.168.88.1 Squid/DansGuardian :192.168.88.100 Client : 192.168.88.238 Client --- Gateway --- Proxy --- Internet I have set up a simple NAT rule to forward all traffic from the client machine (for testing purposes) to go to the DansGuardian. The traffic seems to get there, although I see a lot of SYN_RECV w/ a netstat -antp command on the virtual appliance machine. From this I gather that the traffic is NOT being routed back to the client machine. Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN - tcp 0 0 192.168.88.100:8080 192.168.88.238:55786 SYN_RECV - tcp 0 0 192.168.88.100:8080 192.168.88.238:55787 SYN_RECV - tcp 0 0 192.168.88.100:8080 192.168.88.238:55785 SYN_RECV - tcp 0 0 192.168.88.100:8080 192.168.88.238:55788 SYN_RECV - tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN - Is this a routing issue or an issue with the Squid Appliance?

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  • Incoming traffic while on public network

    - by zvikico
    I'm developing a web app and I need to be able to get incoming traffic from 3rd party services I use. This is a classic webhooks situation: I send a request with a return address and receive the response (via HTTP) some time later to the given address. The simple solution would be to provide my external IP address and forward the incoming traffic from the router to my machine. However, I'm working in a large office and I cannot control the router configuration. I'm looking for a different way to achieve that. I do have servers online. I can have a daemon running on one of those servers, which will handle the incoming traffic. I can run a parallel daemon on my machine, which will keep an open connection with the remote daemon (over ssh preferred) and when an inbound traffic is received by the remote, it will send it to the local, which will send it to the correct port on my machine, as if it was received in the natural way. Is there any ready-made solution for that? PS. I'm on OS X and my server is Ubuntu. Thanks, zvikico

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  • Script to setup Ubuntu as a wireless access point on a bridge mode

    - by nixnotwin
    I use the following script to make my netbook a full-fledged wireless access point. It creates a bridge with eth0 and wlan0 and starts hostapd. #!/bin/bash service network-manager stop ifconfig eth0 0.0.0.0 #remove IP from eth0 ifconfig eth0 up #ensure the interface is up ifconfig wlan0 0.0.0.0 #remove IP from eth1 ifconfig wlan0 up #ensure the interface is up brctl addbr br0 #create br0 node hostapd -d /etc/hostapd/hostapd.conf > /var/log/hostapd.log & sleep 5 brctl addif br0 eth0 #add eth0 to bridge br0 brctl addif br0 wlan0 #add wlan0 to bridge br0 ifconfig br0 192.168.1.15 netmask 255.255.255.0 #ip for bridge ifconfig br0 up #bring up interface route add default gw 192.168.1.1 # gateway This script works efficiently. But if I want to revert back to use Network Manager, I cannot do it. The bridge simply cannot be deleted. How can I modify this script so that if I run bridge_script --stop, the bridge gets deleted, network manager starts and interfaces behave as if the machine had a fresh reboot.

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  • Can't ping Ubuntu laptop from my LAN

    - by oskar
    My laptop has Ubuntu 10.10 and is connected to my router with full internet access, yet I can't ping it from other computers on my LAN. I tried the following: I can successfully ping those other computers from my Ubuntu laptop, so I didn't accidentally connect to someone else's network. I can successfully ping my Ubuntu laptop from itself, though I don't know if that means anything. I haven't messed with iptables at all, so it currently doesn't have any rules set that would cause it to reject anything. I made a DHCP reservation for my laptop's MAC address in my router to make sure I was always using the correct IP address. Please note that I am using a "command line only" install of Ubuntu, so I can't use any GUI network config tools. The reason I want to ping it is because I am trying to run an NFS server on the laptop, yet despite correctly setting it up I cannot access the NFS volume on another computer because it isn't even visible on the network right now.

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  • Can't ping Ubuntu laptop from my LAN

    - by oskar
    My laptop has Ubuntu 10.10 and is connected to my router with full internet access, yet I can't ping it from other computers on my LAN. I tried the following: I can successfully ping those other computers from my Ubuntu laptop, so I didn't accidentally connect to someone else's network. I can successfully ping my Ubuntu laptop from itself, though I don't know if that means anything. I haven't messed with iptables at all, so it currently doesn't have any rules set that would cause it to reject anything. I made a DHCP reservation for my laptop's MAC address in my router to make sure I was always using the correct IP address. Please note that I am using a "command line only" install of Ubuntu, so I can't use any GUI network config tools. The reason I want to ping it is because I am trying to run an NFS server on the laptop, yet despite correctly setting it up I cannot access the NFS volume on another computer because it isn't even visible on the network right now.

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  • Script to setup ubuntu as a wireless accesspoint on a bridge mode

    - by nixnotwin
    I use the following script to make my netbook a full-fledged wireless accesspoint. It creates a bridge with eth0 and wlan0 and starts hostapd. #!/bin/bash service network-manager stop ifconfig eth0 0.0.0.0 #remove IP from eth0 ifconfig eth0 up #ensure the interface is up ifconfig wlan0 0.0.0.0 #remove IP from eth1 ifconfig wlan0 up #ensure the interface is up brctl addbr br0 #create br0 node hostapd -d /etc/hostapd/hostapd.conf > /var/log/hostapd.log & sleep 5 brctl addif br0 eth0 #add eth0 to bridge br0 brctl addif br0 wlan0 #add wlan0 to bridge br0 ifconfig br0 192.168.1.15 netmask 255.255.255.0 #ip for bridge ifconfig br0 up #bring up interface route add default gw 192.168.1.1 # gateway This script works efficiently. But if I want to revert back to use Network Manager, I cannot do it. The bridge simply cannot be deleted. How can I modify this script so that if I run bridge_script --stop, the bridge gets deleted, network manager starts and interfaces behave as if the machine had a fresh reboot.

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  • Enabling DHCP without being connected

    - by Joe Philllips
    I was installing Ubuntu server the other night and I was not able to hook up to the network while installing because I don't have a monitor for my desktop machines. I had to go into the living room and connect to the HDTV instead. This leaves me without network connectivity. When installing it asks how I would like to set up the network. I would like to enable DHCP but it tries to detect a gateway when I do this and obviously it doesn't find anything. It won't let me move on without setting up an IP manually at that point. Isn't there a way I can enable DHCP for the next time it boots up instead? Why the need for it right then and there?

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  • When Ubuntu Server restarts eth0 Doesn't come back up

    - by JoelGsus
    Every time I restart my Ubuntu Server 11.10 I can't ssh into it because ETH0 doesn't come up automatically. I never had this problem before upgrading to 11.10. I have to login to the server and start the ETH0 manually. I would appreciate it any help. Thanks. Here is my /etc/networks/interfaces file: #The loopback network interface auto lo eth0 iface lo inet loopback # The primary network interface iface eth0 inet static address 192.168.1.102 netmask 255.255.255.0 broadcast 192.168.1.255 network 192.168.1.0 gateway 192.168.1.1

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  • How to debug wifi connection?

    - by mmb
    I am using Ubuntu's Network Manager to connect to a local wifi router. My problem is, that it often disconnects without any visible reason (router is on, internet connection seems to be working, wifi diodes are blinking). I mostly have to disable wifi from Network Manager, enable it again to get wifi connecting again. Plus I am often experiencing Network Manager trying to connect to my wifi, trying several times but then giving up. I even tried an external usb-wifi card, but with the very same results. My question is: How can I debug this? Which logs should I read to see what is really happening when all of these errors occur - so I can post them here and see how to proceed?

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  • Fiddler not sniffing SOAP traffic from ASP.NET website

    - by JohnIdol
    So far I've been successfully using fiddler to sniff web service traffic from both test fixtures, console apps and web projects. Today I noticed I am not able anymore to sniff that kind of traffic if I am running my web application (it's a ASP.NET website, hosted locally on IIS). I see all the local traffic but the web service traffic is just gone (the service is being hit as I do see the response debugging into the code). I am still able to successfully sniff soap requests and responses from test fixtures or console apps in the same solution (exact same environment). If it was a windows (I am on Win7) security update or the likes it would never work I guess (unless it affects only traffic routed through IIS). What should I be looking for that could cause the emergence this behavior? Any pointers appreciated!

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  • How is the "change password at next logon" requirement supposed to work with RDP using Network Level Authentication?

    - by NReilingh
    We have a Windows server (2008 R2) with the "Remote Desktop Services" feature installed and no Active Directory domain. Remote desktop is set up to "Allow connections only from computers running Remote Desktop with Network Level Authentication (more secure)". This means that before the remote screen is displayed, the connection is authenticated in a "Windows Security: Enter your credentials" window. The only two role services installed on this server is the RD Session Host and Licensing. When the "User must change password at next logon" checkbox is selected in the properties for a local user on this server, the following displays on a client computer after attempting to connect using the credentials that were last valid: On some other servers using RDP for admin access (but without the Remote Desktop Services role installed), the behavior is different -- the session begins and the user is given a change password prompt on the remote screen. What do I need to do to replicate this behavior on the Remote Desktop Services server?

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  • Rerouting traffic from port 80 to another port on a single ip

    - by zam
    I have a server with multiple IP addresses associated with it. I'm trying to run a node.js web server (which I do not want to run as root), using only one of those ip addresses (it would be very bad if the traffic from all the ip addresses were forwarded). Through searching superuser, it looked like this could be possible with iptables: How to setting up iptables for traffic fowarding on port 80 from specific sources iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 --source 212.333.111.222 -j REDIRECT --to-port 9020 However, I do not understand why eth0 is needed. According to: http://blog.softlayer.com/2011/iptables-tips-and-tricks-port-redirection/ this could be done with: iptables -t nat -A PREROUTING -p tcp --dport 2525 -j REDIRECT --to-ports 25 What is the correct way of forwarding traffic from a single ip on port 80, lets say 111.111.111.111:80 to another port on the same server, lets say 111.111.111.111:8765? thanks for your help!

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  • AWS VPN Tunnel going down without traffic

    - by Asfura
    I managed to setup a site-to-site VPN connection from Amazon VPC to a company's network, and after a lot of configuration it was working fine, but now i realized that the VPN tunnel is DOWN every time there's no traffic going trough for a couple minutes. The only way that i have found to generate traffic is to reach the amazon instance from the company's network and then the tunnel goes up again. I had a cronjob doing ping every minute, but i think it should have a keepalive option somewhere, or at least a log file of the tunnels to find out what's going on. Any ideas to keep the tunnel up and/or bring it up from amazon? The firewall is a Checkpoint R75.20, it only allows one tunnel at a time for the same subnet, so i cant have both tunnels active. Thank you, any questions just ask. EDIT I forgot to add, the ping keepalive was working great (maybe generating a bit of traffic, but nothing to worry about), the connection dropped because i had to restart the instance, and it that little time it dropped me.

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  • Lot of Multicast traffic on LAN

    - by Nel
    Recently the whole network at work is being hit by multicast traffic originating on the LAN itself. I did some investigating and the service which seems to be responsible is ws-discovery. I have attached a screenshot of wireshark capturing the traffic. I have tried shutting down the source machine from which it was originating, but the multicast traffic still seems to be present in the network. My network topology 2 subnets - 10.10.10.0/24 and 10.20.10.0/24. Gateway is a debian system. We have 3 switches for 3 floors. They are all unmanaged Dlink 24-port switches. Multicast blocking at switch level is out of the question. Any solutions? :(

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  • Block P2P traffic on a Linksys router WRT54G with tomato firmware

    - by Kami
    Hi, I'm running a small wireless network (6 to 10 users) on a Lynksys WRT54G with tomato firmware sharing an internet connection. I don't want the users to download files with bittorrent (mainly used) and other p2p apps. I've also found some solutions about lowering p2p traffic priority using QoS. I really need to BAN p2p traffic. Does anyone know how to setup some rules to deny that kind of traffic ? I've tried to setup an Access Restriction Rule: But it's not working at all ...

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  • Routing traffic to another internal network

    - by Jason
    OK, so here is the scenario. I have 4 Locations connected with an MPLS. I have installed an ASA at the primary location which is 10.20.1.0. Traffic is fine internally and to the world, however... I can't route traffic over the MPLS to another network. It is being blocked by an implicit deny rule even though there is a rule to allow any to any less secure interface (it should be using the same interface in/out, right?). I have a static route for the network in and the ASA can ping it - Just not traffic on the internal network of the ASA. -Jason

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  • Network MP600 printer asking me to install new driver on laptop.

    - by user15003
    I have windows 7 home 32-bit on my desktop which is connected to my mp600 via USB. I have Vista 64-bit on my laptop. The MP600 is set for sharing and appears under printers in network under my pc's name. When I click on connect it says "The server for canon inkjet mp600 printer does not have the correct printer drivers installed........." I don't know what to do and it is really frustrating. It all worked fine before when I had XP 32 bit on my desktop

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  • What is the crappiest network build you've ever seen?

    - by Ivan Petrushev
    This is only about networks you have seen personaly, not heared from others or seen on pictures at the web. Cables hanging from the ceiling lamps? Cables going trough culverts and other tubes? Switches and other equipment in the cleaner's closet? Cleaning lady's rags drying hanging from the cables? Key to the main node door possesed only by the janitor (or other non-tech and completely non-network-related guy)? Switches powered by foreign power adapters (cheaper and providing non-specified voltage or amperage)? All of this was in my old dormitory. Tell us about your bad experience.

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  • Routing traffic to another internal network

    - by Jason
    OK, so here is the scenario. I have 4 Locations connected with an MPLS. I have installed an ASA at the primary location which is 10.20.1.0. Traffic is fine internally and to the world, however... I can't route traffic over the MPLS to another network. It is being blocked by an implicit deny rule even though there is a rule to allow any to any less secure interface (it should be using the same interface in/out, right?). I have a static route for the network in and the ASA can ping it - Just not traffic on the internal network of the ASA. -Jason

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  • Cisco Pix does not let traffic pass from outside to inside even though ACL permits

    - by Rickard
    I have tried to make my pix 515 allow traffic from outisde interface to inside, but despite permitting ACL's, it doesn't seem to let traffic through. (It is letting traffic out as it should though) I am have tried both of the following: access-list acl_in extended permit tcp any host 10.131.73.2 eq www and access-list acl_in extended permit ip any any None of them help, but I can access 10.131.73.2 from any host on the inside network. This is a one single host on the inside that should every now and then have an HTTP server running for development purpouses, so it doesn't need to reside on DMZ (and as far as I know, I can't place it on DMZ either as it's in the same subnet as the other ip's I have. Could I have missed anything? I am using PIX Version 8.0(4) My current running config looks like this: http://pastebin.com/TvRFyDrF Hope someone can help me get this working.

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  • Getting live traffic/visitor analytics when using a reverse proxy

    - by jotto
    I'm in process of implementing Varnish as a reverse proxy for a Ruby on Rails app and I'm using Google Analytics (JS/client side script to record visitor data) but it's several hours delayed so its useless for knowing what's going on now. I need at a glance live data that includes referring traffic and what current req/sec is. Right now I am using a simple Rack middleware application to do the live stats (gist.github.com/235745) but if the majority of traffic hits Varnish, Rack will never be hit so this won't work. The closest solution I've found so far is http://www.reinvigorate.net/ but it's in beta (there are also no implementation details on their front page). Does Varnish have traffic logs that I can custom format to match my Apache logs so I can combine them, or will I have to roll my own JS implementation like GA that shows the data in real time?

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  • Lot of Multicast traffic on LAN

    - by Nel
    Recently the whole network at work is being hit by multicast traffic originating on the LAN itself. I did some investigating and the service which seems to be responsible is ws-discovery. I have attached a screenshot of wireshark capturing the traffic. I have tried shutting down the source machine from which it was originating, but the multicast traffic still seems to be present in the network. My network topology 2 subnets - 10.10.10.0/24 and 10.20.10.0/24. Gateway is a debian system. We have 3 switches for 3 floors. They are all unmanaged Dlink 24-port switches. Multicast blocking at switch level is out of the question. Any solutions? :(

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  • How to automatically enter username and password for network location in batch file?

    - by Phoenix Logan
    I have a batch file that copies files to a network location on WebDAV. The address looks something like this: \\xxxxxxxxx.net@SSL@2078\DavWWWRoot When I restart my computer, the batch file doesn't work and says "Access denied". Before a restart, it works, but it doesn't after the computer restarts. The problem is that it requires me to put in the username and password used to access the server. I have to browse to the server in File Explorer and sign in first. Even if I select the "Remember password" check box, it doesn't work. How can I get it to automatically sign in? I don't want to have to do this every time.

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  • Block P2P traffic on a Linksys router WRT54G with Tomato firmware

    - by Kami
    I'm running a small wireless network (6 to 10 users) on a Linksys WRT54G with Tomato firmware sharing an Internet connection. I don't want the users to download files with BitTorrent (mainly used) and other P2P apps. I've also found some solutions about lowering P2P traffic priority using QoS. I really need to ban P2P traffic. Does anyone know how to setup some rules to deny that kind of traffic? I've tried to setup an Access Restriction Rule: However it's not working at all.

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  • How would you diagnose an integrated network card that doesn't show up on the device list?

    - by Tomer Gabel
    I've been setting up a server based around a Gigabyte GA-G33M-DS2R motherboard (G33, PCH9R with integrated Realtek 811B network device. I've enabled it in the BIOS, but it doesn't show up in the pre-boot PCI device list, isn't recognized by Windows (even after installing the chipset and networking drivers) and doesn't even show up via lspci. I've tried cycling power, disabling, cycling again, enabling, cycling again etc. to no avail. I'm sort of at a loss at this point; the board isn't under warranty anymore, but I'd rather not have to replace it. Any advice would be greatly appreciated...

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