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• Regulating outgoing traffic on ubuntu VM

  - by DazSlayer

  I am making a virtual network setup for my high school cybersecurity team to practice. I am connecting all the VMs together through a VPN and then people who are practicing will VPN in and ssh/remote desktop into the different VMs. The problem is that for practicing, they will need root access into the VMs and because the VMs are connecting to my personal network, the VMs pose a security risk to my personal network. Is there any way in either VMWare or VirtualBox or even making an unchangeable iptable (I can make all the windows VMs go thru a linux VM) to prevent people from connecting to my local network via the VM?

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• Sun Fire X4270 M3 SAP Enhancement Package 4 for SAP ERP 6.0 (Unicode) Two-Tier Standard Sales and Distribution (SD) Benchmark

  - by Brian

  Oracle's Sun Fire X4270 M3 server achieved 8,320 SAP SD Benchmark users running SAP enhancement package 4 for SAP ERP 6.0 with unicode software using Oracle Database 11g and Oracle Solaris 10. The Sun Fire X4270 M3 server using Oracle Database 11g and Oracle Solaris 10 beat both IBM Flex System x240 and IBM System x3650 M4 server running DB2 9.7 and Windows Server 2008 R2 Enterprise Edition. The Sun Fire X4270 M3 server running Oracle Database 11g and Oracle Solaris 10 beat the HP ProLiant BL460c Gen8 server using SQL Server 2008 and Windows Server 2008 R2 Enterprise Edition by 6%. The Sun Fire X4270 M3 server using Oracle Database 11g and Oracle Solaris 10 beat Cisco UCS C240 M3 server running SQL Server 2008 and Windows Server 2008 R2 Datacenter Edition by 9%. The Sun Fire X4270 M3 server running Oracle Database 11g and Oracle Solaris 10 beat the Fujitsu PRIMERGY RX300 S7 server using SQL Server 2008 and Windows Server 2008 R2 Enterprise Edition by 10%. Performance Landscape SAP-SD 2-Tier Performance Table (in decreasing performance order). SAP ERP 6.0 Enhancement Pack 4 (Unicode) Results (benchmark version from January 2009 to April 2012) System OS Database Users SAPERP/ECCRelease SAPS SAPS/Proc Date Sun Fire X4270 M3 2xIntel Xeon E5-2690 @2.90GHz 128 GB Oracle Solaris 10 Oracle Database 11g 8,320 20096.0 EP4(Unicode) 45,570 22,785 10-Apr-12 IBM Flex System x240 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE DB2 9.7 7,960 20096.0 EP4(Unicode) 43,520 21,760 11-Apr-12 HP ProLiant BL460c Gen8 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE SQL Server 2008 7,865 20096.0 EP4(Unicode) 42,920 21,460 29-Mar-12 IBM System x3650 M4 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE DB2 9.7 7,855 20096.0 EP4(Unicode) 42,880 21,440 06-Mar-12 Cisco UCS C240 M3 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 DE SQL Server 2008 7,635 20096.0 EP4(Unicode) 41,800 20,900 06-Mar-12 Fujitsu PRIMERGY RX300 S7 2xIntel Xeon E5-2690 @2.90GHz 128 GB Windows Server 2008 R2 EE SQL Server 2008 7,570 20096.0 EP4(Unicode) 41,320 20,660 06-Mar-12 Complete benchmark results may be found at the SAP benchmark website http://www.sap.com/benchmark. Configuration and Results Summary Hardware Configuration: Sun Fire X4270 M3 2 x 2.90 GHz Intel Xeon E5-2690 processors 128 GB memory Sun StorageTek 6540 with 4 * 16 * 300GB 15Krpm 4Gb FC-AL Software Configuration: Oracle Solaris 10 Oracle Database 11g SAP enhancement package 4 for SAP ERP 6.0 (Unicode) Certified Results (published by SAP): Number of benchmark users: 8,320 Average dialog response time: 0.95 seconds Throughput: Fully processed order line: 911,330 Dialog steps/hour: 2,734,000 SAPS: 45,570 SAP Certification: 2012014 Benchmark Description The SAP Standard Application SD (Sales and Distribution) Benchmark is a two-tier ERP business test that is indicative of full business workloads of complete order processing and invoice processing, and demonstrates the ability to run both the application and database software on a single system. The SAP Standard Application SD Benchmark represents the critical tasks performed in real-world ERP business environments. SAP is one of the premier world-wide ERP application providers, and maintains a suite of benchmark tests to demonstrate the performance of competitive systems on the various SAP products. See Also SAP Benchmark Website Sun Fire X4270 M3 Server oracle.com OTN Oracle Solaris oracle.com OTN Oracle Database 11g Release 2 Enterprise Edition oracle.com OTN Disclosure Statement Two-tier SAP Sales and Distribution (SD) standard SAP SD benchmark based on SAP enhancement package 4 for SAP ERP 6.0 (Unicode) application benchmark as of 04/11/12: Sun Fire X4270 M3 (2 processors, 16 cores, 32 threads) 8,320 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, Oracle 11g, Solaris 10, Cert# 2012014. IBM Flex System x240 (2 processors, 16 cores, 32 threads) 7,960 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, DB2 9.7, Windows Server 2008 R2 EE, Cert# 2012016. IBM System x3650 M4 (2 processors, 16 cores, 32 threads) 7,855 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, DB2 9.7, Windows Server 2008 R2 EE, Cert# 2012010. Cisco UCS C240 M3 (2 processors, 16 cores, 32 threads) 7,635 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, SQL Server 2008, Windows Server 2008 R2 DE, Cert# 2012011. Fujitsu PRIMERGY RX300 S7 (2 processors, 16 cores, 32 threads) 7,570 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, SQL Server 2008, Windows Server 2008 R2 EE, Cert# 2012008. HP ProLiant DL380p Gen8 (2 processors, 16 cores, 32 threads) 7,865 SAP SD Users, 2 x 2.90 GHz Intel Xeon E5-2690, 128 GB memory, SQL Server 2008, Windows Server 2008 R2 EE, Cert# 2012012. SAP, R/3, reg TM of SAP AG in Germany and other countries. More info www.sap.com/benchmark

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• Route forwarded traffic through eth0 but local traffic through tun0

  - by Ross Patterson

  I have a Ubuntu 12.04/Zentyal 2.3 server configured with WAN NATed on eth0, local interfaces eth1 and wlan0 bridged on br1 on which DHCP runs, and an OpenVPN connection on tun0. I only need the VPN for some things running on the gateway itself and I need to make sure that everything running on the gateway goes through the VPNs tun0. root:~# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default gw... 0.0.0.0 UG 100 0 0 eth0 link-local * 255.255.0.0 U 1000 0 0 br1 192.168.1.0 * 255.255.255.0 U 0 0 0 br1 A.B.C.0 * 255.255.255.0 U 0 0 0 eth0 root:~# ip route 169.254.0.0/16 dev br1 scope link metric 1000 192.168.1.0/24 dev br1 proto kernel scope link src 192.168.1.1 A.B.C.0/24 dev eth0 proto kernel scope link src A.B.C.186 root:~# ip route show table main 169.254.0.0/16 dev br1 scope link metric 1000 192.168.1.0/24 dev br1 proto kernel scope link src 192.168.1.1 A.B.C.0/24 dev eth0 proto kernel scope link src A.B.C.D root:~# ip route show table default default via A.B.C.1 dev eth0 How can I configure routing (or otherwise) such that all forwarded traffic for other hosts on the LAN goes through eth0 but all traffic for the gateway itself goes through the VPN on tun0? Also, since the OpenVPN client changes routing on startup/shutdown, how can I make sure that everything running on the gateway itself loses all network access if the VPN goes down and never goes out eth0.

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• Overriding routes on Openvpn client, iproute, iptables2

  - by sarvavijJana

  I am looking for some way to route packets based on its destination ports switching regular internet connection and established openvpn tunnel. This is my configuration OpenVPN server ( I have no control over it ) OpenVPN client running ubuntu wlan0 192.168.1.111 - internet connected if Several routes applied on connection to openvpn from server: /sbin/route add -net 207.126.92.3 netmask 255.255.255.255 gw 192.168.1.1 /sbin/route add -net 0.0.0.0 netmask 128.0.0.0 gw 5.5.0.1 /sbin/route add -net 128.0.0.0 netmask 128.0.0.0 gw 5.5.0.1 And I need to route packets regarding it's destination ports for ex: 80,443 into vpn everything else directly to isp connection 192.168.1.1 What i have used during my attempts: iptables -A OUTPUT -t mangle -p tcp -m multiport ! --dports 80,443 -j MARK --set-xmark 0x1/0xffffffff ip rule add fwmark 0x1 table 100 ip route add default via 192.168.1.1 table 100 I was trying to apply this settings using up/down options of openvpn client configuration All my attempts reduced to successful packet delivery and response only via vpn tunnel. Packets routed bypassing vpn i have used some SNAT to gain proper src address iptables -A POSTROUTING -t nat -o $IF -p tcp -m multiport --dports 80,443 -j SNAT --to $IF_IP failed in SYN-ACK like 0 0,1 0,1: "70","192.168.1.111","X.X.X.X","TCP","34314 > 81 [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=18664016 TSER=0 WS=7" "71","X.X.X.X","192.168.1.111","TCP","81 > 34314 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1428 TSV=531584430 TSER=18654692 WS=5" "72","X.X.X.X","192.168.1.111","TCP","81 > 34314 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1428 TSV=531584779 TSER=18654692 WS=5" "73","192.168.1.111","X.X.X.X","TCP","34343 > 81 [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=18673732 TSER=0 WS=7" I hope someone has already overcome such a situation or probably knows better approach to fulfill requirements. Please kindly give me a good advice or working solution.

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• Can OpenVPN invoke DHCP Client?

  - by Ency

  I have got working VPN connection through openvpn, but I would like to use also my DHCP server and not openvpn's push feature. Currently everything works fine, but I have to manually start dhcp client, eg. dhclient tap0 and I get IP and other important stuff from my DHCP, is there any directive which start DHCP Client when connection is established? There is my client's config: remote there.is.server.com float dev tap tls-client #pull port 1194 proto tcp-client persist-tun dev tap0 #ifconfig 192.168.69.201 255.255.255.0 #route-up "dhclient tap0" #dhcp-renew ifconfig 0.0.0.0 255.255.255.0 ifconfig-noexec ifconfig-nowarn ca /etc/openvpn/ca.crt cert /etc/openvpn/encyNtb_openvpn_client.crt key /etc/openvpn/encyNtb_openvpn_client.key dh /etc/openvpn/dh-openvpn.dh ping 10 ping-restart 120 comp-lzo verb 5 log-append /var/log/openvpn.log Here comes server's config: mode server tls-server dev tap0 local servers.ip.here port 1194 proto tcp-server server-bridge # Allow comunication between clients client-to-client # Allowing duplicate users per one certificate duplicate-cn # CA Certificate, VPN Server Certificate, key, DH and Revocation list ca /etc/ssl/CA/certs/ca.crt cert /etc/ssl/CA/certs/openvpn_server.crt key /etc/ssl/CA/private/openvpn_server.key dh /etc/ssl/CA/dh/dh-openvpn.dh crl-verify /etc/ssl/CA/crl.pem # When no response is recieved within 120seconds, client is disconected keepalive 10 60 persist-tun persist-key user openvpn group openvpn # Log and Connected clients file log-append /var/log/openvpn verb 3 status /var/run/openvpn/vpn.status 10 # Compression comp-lzo #Push data to client push "route-gateway 192.168.69.1" push "redirect-gateway def1"

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• ISA Server dropping packets as it believes they are spoofed

  - by RB

  We have ISA Server 2004 running on Windows Server 2003 SP2. It has 2 NICs - one internal called LAN on 192.168.16.2, with a subnet of 255.255.255.0, and one external called WAN on 93.x.x.2. The default gateway is 93.x.x.1 (our modem). This machine also accepts VPN connections. We are having a problem with a scanner, which is trying to save a scan into a network share. Every time we try to scan, ISA Server logs the following Denied Connection Log type: Firewall service Status: A packet was dropped because ISA Server determined that the source IP address is spoofed. Rule: Source: Internal ( 192.168.16.54:1024) Destination: Internal ( 192.168.16.255:137) Protocol: NetBios Name Service Pinging 192.168.16.54 from the ISA Server works fine. In ISA Server, going into Configuration → Networks, there are 5 Networks : - External (inbuilt) - Internal (defined as 192.168.16.0 → 192.168.16.255) - Local Host (inbuilt) - Quarantined VPN Clients (inbuilt) - VPN Clients (inbuilt) Finally, under Network Connections → Advanced → Advanced Settings..., the connections are in the following order : - LAN - WAN - [Remote Access Connections] If we try to scan onto a workstation it works fine. Please let me know if you need any more info - many thanks. RB.

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• Specific DNS sometimes resolves to wildcard, incorrectly

  - by Mojo

  I have an intermittent problem, and I'm not sure where to start trying to troubleshoot it. In our dev environment, we have two visible IP addresses on load balancers, one to the front-end, and one to a number of back-end service machines. The front-end is configured to take a wildcard DNS name to support generic "portals." dev.example.com A 10.1.1.1 *.dev.example.com CNAME dev.example.com The back-end servers are all specific names within the same space: core.dev.example.com A 10.1.1.2 cms.dev.example.com CNAME core.dev.example.com search.dev.example.com CNAME core.dev.example.com Here's the problem. Periodically a developer or a program trying to reach, say, cms.dev.example.com will get a result that points to the front-end, instead of the back-end load balancer: cms.dev.example.com is an alias to core.dev.example.com core.dev.example.com is an alias to dev.example.com (WRONG!) dev.example.com 10.1.1.1 The developers are all on Mac OS X machines, though I've seen the problem occur on an Ubuntu machine as well, using a local cloud host DNS resolver. Sometimes the developer is using a VPN, which directs the DNS to its own resolver, and sometimes he's on the local net using a DNS resolver assigned by the NAT router. Sometimes clearing the Mac OS X DNS cache, logging into the VPN, then logging out of the VPN, will make the problem go away. The origin authoritative server is on zerigo, and a dig directly to their name servers always seems to give the correct answer. The published DNS cache time for these records is 15 minutes, but the problem has been intermittent for about a week. Any troubleshooting suggestions?

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• Prevent outgoing traffic unless OpenVPN connection is active using pf.conf on Mac OS X

  - by Nick

  I've been able to deny all connections to external networks unless my OpenVPN connection is active using pf.conf. However, I lose Wi-Fi connectivity if the connection is broken by closing and opening the laptop lid or toggling Wi-Fi off and on again. I'm on Mac OS 10.8.1. I connect to the Web via Wi-Fi (from varying locations, including Internet cafés). The OpenVPN connection is set up with Viscosity. I have the following packet filter rules set up in /etc/pf.conf # Deny all packets unless they pass through the OpenVPN connection wifi=en1 vpn=tun0 block all set skip on lo pass on $wifi proto udp to [OpenVPN server IP address] port 443 pass on $vpn I start the packet filter service with sudo pfctl -e and load the new rules with sudo pfctl -f /etc/pf.conf. I have also edited /System/Library/LaunchDaemons/com.apple.pfctl.plist and changed the line <string>-f</string> to read <string>-ef</string> so that the packet filter launches at system startup. This all seems to works great at first: applications can only connect to the web if the OpenVPN connection is active, so I'm never leaking data over an insecure connection. But, if I close and reopen my laptop lid or turn Wi-Fi off and on again, the Wi-Fi connection is lost, and I see an exclamation mark in the Wi-Fi icon in the status bar. Clicking the Wi-Fi icon shows an "Alert: No Internet connection" message: To regain the connection, I have to disconnect and reconnect Wi-Fi, sometimes five or six times, before the "Alert: No Internet connection" message disappears and I'm able to open the VPN connection again. Other times, the Wi-Fi alert disappears of its own accord, the exclamation mark clears, and I'm able to connect again. Either way, it can take five minutes or more to get a connection again, which can be frustrating. Why does Wi-Fi report "No internet connection" after losing connectivity, and how can I diagnose this issue and fix it?

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• Simple Linux program that takes any HTTP/HTTPS request and returns a single page?

  - by ultrasawblade

  I have a Linux box operating as router. There's a NIC that's connected to the internet (WAN), a NIC connected to an 8-port GbE switch (LAN), and a NIC connected to a Linksys wireless N-router (WLAN). Routing between everything is working perfectly. I have security completely disabled on the wireless router, but the WLAN NIC is firewalled such that it will only accept DNS queries and PPTP VPN connections. Currently HTTP/HTTPS traffic and everything else is blocked. I would like to run something that listens on port 80/443 of the WLAN NIC, and, for non VPN'ed connections, given any HTTP/HTTPS request it will return a single webpage saying "Unauthenticated" and explain how to sign into the VPN. A transparent proxy seems to be what I need, but my searches all seem to direct me to Squid, which is already running on my server and seems overkill for this simple task. Is there a simpler, lightweight program out there that does just this or should I just suck it up and run two instances of Squid (or figure out how to configure it)? Or, is this entire VPN thing I'm doing complete nonsense and I should just enable encryption on the wireless router?

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• Translating IPTables rule to UFW

  - by Dario Fumagalli

  we are using an Ubuntu 12.04 x64 LTS VPS. Firewall being used is UFW. I have setup a Varnish + LEMP setup. along with other things, including an Openswan IPSEC VPN from our office to the VPS data center. A second in house Ubuntu box is to act as MySQL slave and fetch data from the VPS through the VPN. Master's ppp0 is seen as 10.1.2.1 from the slave, they ping etc. I have done the various required tasks but I can't get the client (slave) MySQL (nor telnet 10.1.2.1 3306) to access the master through the VPN unless I issue this fairly obvious IPTables command: iptables -A INPUT -s 10.1.2.0/24 -p tcp --dport 3306 -j ACCEPT I willingly forced the accepted input to come from the last octet. With this rule everything works just fine! However I want to translate this command to UFW syntax so to keep everything in one place. Now I admit being inexperienced with UFW, I prepared rules like: ufw allow proto tcp from 10.1.2.0/24 port mysql and 2-3 variations involving specifying 3306 instead of mysql, specifying a target IP (MySQL's my.cnf at the moment is configured as 0.0.0.0) and similar but I just don't seem to be able to replicate the simple iptables rule in a functional way. Anyone could kindly give me a suggestion that is not to dump UFW? Thanks in advance.

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• How to configure network on Windows Server 2008

  - by Gokhan Ozturk

  I have a IBM x3400 Server Machine with Windows Server 2008 R2 installed on it. But, since I am not expert on networking I have some problems. These roles installed on my server: Active Directory DNS File Sharing Hyper-V ISS VPN There is two network card on them. I configured them like this: Local Connection 1: 192.168.30.3 255.255.255.0 192.168.30.2 127.0.0.1 Local Connection 2: 192.168.30.101 255.255.255.0 192.168.30.6 127.0.0.1 My problem is, when I use this Ip gateways, It is sharing internet to all computers. This is not I want. I want to use Local Connection 1 for internal network. I am giving all computers gateway and DNS IP as 192.168.30.3 The Local Connection 2 is for Hyper-V and VPN connections. 192.168.30.2 and 192.168.30.6 are my modem's gateways. I am using 192.168.30.6 external IP for VPN connections. There is two 24 port switches. There is a connection between them and this two ethernet card connected directly to them. And modems are connected to switches as well (Morems are not near the server. They are somewhere in the building). I disabled network Bridge and removed all ethernet cards from it. With this configuration, all computers can ping my server's IP (192.168.30.3) but on server I cannot ping any clients (Request timeout). What is the best way to configure my network? Thank you. Redgards

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• OpenVPN + iptables / NAT routing

  - by Mikeage

  Hi, I'm trying to set up an OpenVPN VPN, which will carry some (but not all) traffic from the clients to the internet via the OpenVPN server. My OpenVPN server has a public IP on eth0, and is using tap0 to create a local network, 192.168.2.x. I have a client which connects from local IP 192.168.1.101 and gets VPN IP 192.168.2.3. On the server, I ran: iptables -A INPUT -i tap+ -j ACCEPT iptables -A FORWARD -i tap+ -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth0 -j MASQUERADE On the client, the default remains to route via 192.168.1.1. In order to point it to 192.168.2.1 for HTTP, I ran ip rule add fwmark 0x50 table 200 ip route add table 200 default via 192.168.2.1 iptables -t mangle -A OUTPUT -j MARK -p tcp --dport 80 --set-mark 80 Now, if I try accessing a website on the client (say, wget google.com), it just hangs there. On the server, I can see $ sudo tcpdump -n -i tap0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tap0, link-type EN10MB (Ethernet), capture size 96 bytes 05:39:07.928358 IP 192.168.1.101.34941 > 74.125.67.100.80: S 4254520618:4254520618(0) win 5840 <mss 1334,sackOK,timestamp 558838 0,nop,wscale 5> 05:39:10.751921 IP 192.168.1.101.34941 > 74.125.67.100.80: S 4254520618:4254520618(0) win 5840 <mss 1334,sackOK,timestamp 559588 0,nop,wscale 5> Where 74.125.67.100 is the IP it gets for google.com . Why isn't the MASQUERADE working? More precisely, I see that the source showing up as 192.168.1.101 -- shouldn't there be something to indicate that it came from the VPN? Edit: Some routes [from the client] $ ip route show table main 192.168.2.0/24 dev tap0 proto kernel scope link src 192.168.2.4 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.101 metric 2 169.254.0.0/16 dev wlan0 scope link metric 1000 default via 192.168.1.1 dev wlan0 proto static $ ip route show table 200 default via 192.168.2.1 dev tap0

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• OpenVPN access to a private network

  - by Gior312

  There are many similar topics about my issue, however I cannot figure out a solution for myself. There are three hosts. A without a routable address but with an Internet access. Server S with a routable Internet address and host B behind NAT in a private network. What I've managed to do is a OpenVPN connection between A and B via S. Everything works fine so far according to this manual VPN Setup What I want to do is to connect A to Bs private network 10.A.B.x I tried this manual but had no luck. So A has a vpn address 10.9.0.10, B's vpn address is 10.9.0.6 and B's private network is 10.20.20.0/24. When at the Server I try to make a route to Bs private network like this sudo route add 10.20.20.0 netmask 255.255.255.0 gw 10.9.0.6 dev tun0 it says "route: netmask 000000ff doesn't make sense with host route" but I don't know how to tell Server to look for a private network in a different way. Do you know how can I make it right ?

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• OpenVPN + iptables / NAT routing

  - by Mikeage

  I'm trying to set up an OpenVPN VPN, which will carry some (but not all) traffic from the clients to the internet via the OpenVPN server. My OpenVPN server has a public IP on eth0, and is using tap0 to create a local network, 192.168.2.x. I have a client which connects from local IP 192.168.1.101 and gets VPN IP 192.168.2.3. On the server, I ran: iptables -A INPUT -i tap+ -j ACCEPT iptables -A FORWARD -i tap+ -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth0 -j MASQUERADE On the client, the default remains to route via 192.168.1.1. In order to point it to 192.168.2.1 for HTTP, I ran ip rule add fwmark 0x50 table 200 ip route add table 200 default via 192.168.2.1 iptables -t mangle -A OUTPUT -j MARK -p tcp --dport 80 --set-mark 80 Now, if I try accessing a website on the client (say, wget google.com), it just hangs there. On the server, I can see $ sudo tcpdump -n -i tap0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on tap0, link-type EN10MB (Ethernet), capture size 96 bytes 05:39:07.928358 IP 192.168.1.101.34941 > 74.125.67.100.80: S 4254520618:4254520618(0) win 5840 <mss 1334,sackOK,timestamp 558838 0,nop,wscale 5> 05:39:10.751921 IP 192.168.1.101.34941 > 74.125.67.100.80: S 4254520618:4254520618(0) win 5840 <mss 1334,sackOK,timestamp 559588 0,nop,wscale 5> Where 74.125.67.100 is the IP it gets for google.com . Why isn't the MASQUERADE working? More precisely, I see that the source showing up as 192.168.1.101 -- shouldn't there be something to indicate that it came from the VPN? Edit: Some routes [from the client] $ ip route show table main 192.168.2.0/24 dev tap0 proto kernel scope link src 192.168.2.4 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.101 metric 2 169.254.0.0/16 dev wlan0 scope link metric 1000 default via 192.168.1.1 dev wlan0 proto static $ ip route show table 200 default via 192.168.2.1 dev tap0

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• Sqlserver 2005 Replication issue

  - by Francesco

  Hi, I have a peer to peer Merge Replication from two Sqlserver 2005. The first Sqlserver is both the publisher and distribuitor. All works fine but if the VPN goes down for a couple of hours the replication goes down too and I need to manually restart the sqlserver agent. In the Sqlserver Agent properties I have set the two option about the agent failover but nothing. How I can set an automatic restart of sqlserver agent when the VPN goes down? Thanks

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• Connect to a network via the command line [closed]

  - by justasking

  I want to be able to connect to a network via command line in Windows. My goal is to script out remoting into my work computer. I hate having to always manually connect to the VPN connection and then rdping into my work machine. I want to just have a script which will do both of it for me. I know how to rdp via command line, I just need to know how to connect to my VPN via command line.

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• Connection Multiplexing

  - by whoi

  Hi; Supposing we have opened a connection of type either TCP or UDP to another remote machine. Having this connection, can we allow multiple connections virtually over this connection like VPN(but not VPN)? I mean multiple applications run on remote machine and you try to access to these applications, is there any multiplexing mechanism or concept supporting such feature?

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• Network config / gear question

  - by mcgee1234

  I have been tasked with setting up a fairly straightforward rack in a data center (we do not even need a whole rack, but this is the smallest allotment available). In a nutshell, 4 to 6 servers need to be able to reach 2 (maybe 3) vendors. The servers needs to be reachable over the internet. A little more detail - the networks the servers need to reach are inside of the data center, and are "trusted". Connections to these networks will be achieved through intra data center cross connects. It is kind of like a manufacturing line where we receive data from one vendor (burst-able up to 200 Mbits), churn through it on the servers, and then send out data to another vendor (bursts up to 20 Mbits). This series of events is very latency sensitive, so much so that it is common practice not to use NAT or a firewall on these segments (or so I hear). To reach the servers over the internet, I plan to use a site to site VPN. (This part is only relevant as far as hardware selection goes). I have 2 configurations in mind: Cisco 2911 (2921) (with the additional wan ports module) and a layer 2 switch - in this scenario, I would use the router also for VPN. Cisco 3560 layer 3 switch to interconnect the networks inside of the data center and an ASA 5510 (which is total overkill, but the 5505 is not rack mountable) as a firewall for the Wan side (internet) and VPN. I envision the setup to be as follows: Internet - ASA - 3560 Vendors - 3560 - Servers The general idea is that the ASA acts as a firewall and VPN device and the 3560 does all the heavy lifting. The first is a fairly traditional setup but my concern is performance. The second is somewhat unorthodox in that the vendors are directly connected to the layer 3 switch without passing through a firewall. Based on my understanding however, a layer 3 switch will perform substantially better as it will do hardware (ASIC) vs. software switching. (Note that number 2 is a little over the budget, but not unworkable (double negative, ugh)) Since this is my first time dealing with a data center, I am not sure what the IP space is going to look like. I suspect I will retain a block(s) of public IPs, vlan them to individual interfaces for the vendor connections and the servers (which will not reachable from the wan side of course) and setup routing on the switch. So here are my questionss: Is there a substantial performance difference between 1 and 2, i.e. hardware based switching on a layer 3 vs a software base on the 2911? I have trolled the internet and found a lot of Cisco literature, but nothing that I could really use to get a good handle. The vendors we connect to are secure and trusted (famous last words) and as I understand it, it is common practice not to NAT or firewall these connections (because of the aforementioned latency sensitivity). But what what kind of latency are we really talking about if I push the data through a router (or even ASA for that matter)? For our purposes, 5 ms will not kill us, 20 or 30 can be very costly. Others measure in microseconds, but they are out of our league. Is there any issues with using public IPs on a layer 3 switch? I am certainly not married to either of these configs, and I am totally open to any ideas. My knowledge (and I use the term loosely) is largely from books so I welcome any advice / insight. Thanks in advance.

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• NIC Teaming HP Server running Win2003

  - by Colm

  Hello everyone. I'm new to server NIC TEaming. I have a HP ProLiant DL360 G4p running Win2003 with 2 NICs , only one is currently active. I'd like to activate the 2nd NIC connected (in a active/passive state) to a 2nd switch with only one IP address and ideally only one mac layer address. The 1st switch is a Cisco 2960G and the 2nd is a Cisco C3560G. There are VLANS, RSTP and PAGP in use already. Can someone give me an idea, in broad terms , of what technology/protocols I should be investigating (HSRP, SLB/TLB Teaming etc.) ? I can provide more info if needed. Thanks, Colm.

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• Dual Home HP Server running Win2003

  - by Colm

  Hello everyone. I'm new to server dual homing. I have a HP ProLiant DL360 G4p running Win2003 with 2 NICs , only one is currently active. I'd like to activate the 2nd NIC connected (in a active/passive state) to a 2nd switch with only one IP address and ideally only one mac layer address. The 1st switch is a Cisco 2960G and the 2nd is a Cisco C3560G. There are VLANS, RSTP and PAGP in use already. Can someone give me an idea, in broad terms , of what technology/protocols I should be investigating (HSRP, SLB Teaming etc.) ? I can provide more info if needed. Thanks, Colm.

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• Microsoft Office 2007

  - by nardone25

  Hello everyone in serverfault. I am having a big problem at my job. I will let everyone know what I am using. I have two ibm x3690 servers with vmware esxi on both. Our product server has 8 vm on there. I have two lefthand san from HP. I have a watchgurd firewall. Our other site. I have one server over there ibm x3b90 sever. with one vm on there. I have a cisco 1700 router. and another watchgurd firewall. I have a vpn tunnel to my watchgurd firewall, to my cisco router. Site one works great. site two is having problems saving word documents and having problems printing in publisher 2007. Can someone please help?

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• Bug in CDP implementation

  - by Suraj

  We are developing a Linux based ethernet switch which has 6 ports. We are done with CDP protocol. I have connected a Cisco device to port 2. When I quiery for the Cisco device, I get the reply and instead of getting lan1 (port 1 - lan0 .. port 6 = lan5), I always get the interface name as eth0. The same is the case for all the ports. What changes are required to get the correct interface name? I will be very thankful for the information. The snap packet is received in the routine snap_rcv() in the file "linux._2.6.XX/net/802/psnap.c"; Regards, Suraj..

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• What the hell was THAT?!?

  - by Massimo

  My system is Windows XP SP3, updated with the latest patches. The PC is connected to a Cisco 877 ADSL router, which does NAT from the internal network to its single static public IP address. There are no forwarded ports, and the router's management console can only be accessed from the inside. I was doing two things: working on a remote office machine via VPN and browsing some web pages on the Cisco web site. The remote network is absolutely safe (it's a lab network, four virtual servers, no publicly accessible services and no users at all; also, none of what I'm going to describe ever happened there). The Cisco web site... well, I suppose is quite safe, too. Suddenly, something happened. Strange popups appears anywhere; programs claiming they're "antimalware", "antispyware" et so on begins autoinstalling; fake Windows Update and Security Center icons pop up in the system tray. svchost.exe began crashing repeatedly. Then, finally, after some minutes of this... BSOD. And, upon rebooting, BSOD again. Even in safe mode. Ok, that was obviously some virus/trojan/whatever. I had to install a new copy of Windows on another partition to clean things up. I found strange executables, services and DLLs almost anywhere. Amongst the other things, user32.dll and ndis.sys had been replaced. A fake software called "Antimalware Doctor" had been installed. There were services with completely random names or even GUIDs (!), and also ones called "IpSect" and "Darkness". There were executable files without an .exe extension. There were even two boot-class drivers, which I'm quite sure are the ones that finally caused the system to crash. A true massacre. Ok, now the questions: What the hell was that?!? It was something more than a simple virus! How did it manage to attack my computer, as I am behind a firewall and was not doing anything even only potentially harmful on the web at the time?

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• Internet Dropping?!

  - by stead1984

  I have a virtual DC running DNS and Routing and Remote Access, that routes ALL workstations Internet traffic out to the Internet, this works fine but noticed that the Internet drops occasionally. I've checked with our service provider (Managed Communications) and they are adamant that it's not their fault. The Internet drops seem to affect everyone. We also have a server configured to use the same Internet service on a different network over a site-to-site VPN connection which also suffers from packet drops. I've spoken to Cisco and have done many tests with Cisco and they believe the problem is down to the ISP. I'm wondering if it's a DNS issue, as the Internet service uses OpenDNS. Any ideas?

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• How long do managed gigabit ethernet switches take to boot up?

  - by Warren P

  One critical drawback that I have found in researching managed-switches, and one that I have some past experience with is that anything with "lots" of firmware is going to have lots of issues associated with that firmware. We are in the middle of researching rackmount gigabit switches (48 port). It looks like for 48 ports, our only choice is managed switches (Dell, Cisco/Linksys,HP, etc). What I want to know, that I can not find out much about is the boot-time for various managed switches. If you own one, can you please answer with the model number, and the cold boot time in seconds. I have read online that Linksys (now Cisco) SRW series sometimes take almost 5 minutes before they are fully booted up, and that is an unacceptable cost for us. I particularly want to know about Dell PowerConnect managed switch bootup time (model 3548 and 5448), and would like to confirm the 5-minute boot time on the SRW2048 or similar model, and any HP ProCurve boot up times. The composite of all those figures ought to form an interesting overall performance picture.

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