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• an unknown ip on network

  - by Ahmed safan

  In our office we have many PCs, all of them have static IP addresses. We had a problem with one server with ip 192.168.1.10 dropping off the network occasionally. I unplugged the network cable from the server and from pinged 192.168.1.10 from another host and there was a response. I searched all PCs to see if any has such ip but i didn't found a one. I changed the server ip to fix the problem, but I still find this rogue device using 192.168.1.10 on the network -- how can I figure out what it is? Could it be the ip of virtual machine on someone's PC?

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• Routing only some local IPs through VPN on dd-wrt

  - by bo-inge-ostberg

  Much similar to this entry: http://serverfault.com/questions/94283/using-dd-wrt-to-connect-to-vpn-and-forward-all-traffic-of-certain-devices-through , I have set up my router with dd-wrt + OpenVPN to connect to a VPN. This works fine, and all traffic from behind the router goes through the VPN. How do I route(?) traffic in the router so that only certain IPs from the LAN will go through the VPN, while the others take the "normal" route? Is it also possible to allow traffic from certain local IPs to go ONLY through the VPN, making it impossible for them to use the regular internet connection if the VPN is down? I know this question was answered in the post I linked to, but that just doesn't seem to work for me. The routing table and rules change, but traffic still just goes through the VPN.

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• Plesk 10 Postfix with multiple IP adresses and SSL certificates

  - by JulianB

  We are currently running a root server with Debian 6 and Plesk 10.4.4. We have some virtual hosts using one IP adress (shared) - e.g. example1.com - and another virtual host using a dedicated IP address (example2.com). Is there a way to configure postfix to do the following Always use the IP address of the virtual host to which the e-mail account belongs (so that an e-mail from [email protected] will originate from the shared IP-Address and an e-mail from [email protected] will originate from the dedicated IP? Use different certificates for TLS for example1.com and example2.com? If the latter is not possible: Could any problems arrive when using example1.com as certificate for example2.com users? Of course, example2.com users would have to configure their clients to use example1.com as the SMTP server name to avoid annoying security warnings. But if we still would be able to get the effect of the first point that would still be acceptable.

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• Why my public ip address is different when I visit different website? [closed]

  - by Mett Li

  After I connect to web via pppoe, I visit different website's phpinfo() page, but the result of _SERVER["REMOTE_PORT"] is different. Including some ip address lookup site like www.whatismyip.com, www.apnic.net etc. and gmail's ip location lookup list are all different. Why? Is these different ip address allocated by ISP on different web resources ? Maybe the reason is CDN by my ISP or the website? If the reason is the ip address allocated by ISP on different web resources, the website visitor's ip address may unreal.

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• Free IP address management software

  - by TiFFolk

  We are choosing a system for managing our IP address space. So we are looking for a special free software like IPPlan. So what we have nowadays: Ipplan (Does not support IPv6) SolarWinds IP address tracker (IPv6 support unknown ) IP module of The NOC Project (BTW, take a look of it, seems to be very promising project) (IPv6 support unknown ) phpIP (Does not support IPv6) IP management from RackTables (Does not support IPv6) Do you know about any other special software, like written above? But: No Wiki No DNS No DHCP No spreadsheet Software should provide: Clear view of available addresses Detail listing of all addresses by subnets/search pattern/owners/additional info It must support adding additional info like owner of IP, domain-name, contacts, etc Multi user support Easy interface Software has to be specially written for address management. Scalability Any OS: win, lin, sol, web

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• Policy Routing with Openvpn?

  - by sadawd

  Dear Everyone I am currently using openvpn for normal browsing. However, I have the following services running: a bit torrent client, a web server, IRC and a git server which I would really want it to not be using my vpn connection (and use my original connection instead). Is there a way to do this? I looked up policy routing and I can't really find any tutorial on how to do this on linux (I am on ubuntu). I don't want the solution to be incredibly complicated - I am pretty new to networking in ubuntu and I only want a very simple solution to this problem. Can someone help me out?

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• Weird routing problems with VPN

  - by Borek

  In our VPN setup I have to add a route to my routing table like this: route add 1.2.3.0 mask 255.255.255.0 172.16.1.1 -p Our internal addresses 1.2.3.x then use 172.16.1.1 as their gateway and both my local internet and work VPN can work at the same time. However, when I disconnect from VPN and reconnect again, I can't ping our servers even though the connection status is "Connected". When I do route print my previously added route is listed but it doesn't seem to work. So I try to execute that 'route add' command again and as expected, it tells me that The route addition failed: The object already exists. But - and that's the point - when I now try to ping our servers again, everything works! So every time, I have to execute this route add command that will fail but fix the issue at the same time. Any ideas what I might be doing wrong? My PC is Windows 7 x64, I am Administrator, UAC is enabled and the command prompt is run with elevated privileges.

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• Public static ip for vagrant box

  - by Numbata

  I have server (Debian Squeeze) with 1 ethernet card and 2 public static IPs (188.120.245.4 and 188.120.244.5). What I want: Setup virtual box (Ubuntu) with access via static IP (188.120.244.5). What I was trying: config.vm.forward_port - good idea: setup interface "eth1:1" with 188.120.244.5 on host-machine, and add to Vagrant file "config.vm.forward_port = hmm..?" config.vm.network :hostonly, "188.120.244.5" - not working. Was created new interface on host-machine with ip "188.120.244.1". Of course 188.120.244.1 IP isn't mine and I can't access my server via this IP. config.vm.network :bridged - I'm confused how this works :) What I have now: Not working configuration. Debian-host-machine# cat Vagrantfile Vagrant::Config.run do |config| config.vm.define :gitlab do |box_config| box_config.vm.box = "ubuntu" box_config.vm.host_name = "ubuntu" box_config.vm.network :bridged box_config.vm.network :hostonly, "188.120.244.5", :auto_config => false end end Debian-host-machine# ifconfig eth1 Link encap:Ethernet HWaddr 00:15:17:69:71:bb inet addr:188.120.245.4 Bcast:188.120.247.255 Mask:255.255.248.0 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 vboxnet0 Link encap:Ethernet HWaddr 0a:00:27:00:00:00 inet addr:188.120.244.1 Bcast:188.120.246.255 Mask:255.255.255.0 Ubuntu-virtual-machine# ifconfig eth0 Link encap:Ethernet HWaddr 08:00:27:ee:8d:0c inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0 eth1 Link encap:Ethernet HWaddr 08:00:27:45:71:87 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 How I can access virtual box via public static IP from network? I'm using Oracle VM VirtualBox Manager 4.1.18 and Vagrant version 1.0.3. Thanks in advance for your feedback.

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• Free IP address management software

  - by TiFFolk

  We are choosing a system for managing our IP address space. So we are looking for a special free software like IPPlan. So what we have nowadays: Ipplan (Beta IPv6 support) SolarWinds IP address tracker (IPv6 support unknown ) IP module of The NOC Project (BTW, take a look of it, seems to be very promising project) (IPv6 support unknown ) phpIP (Does not support IPv6) IP management from RackTables (Does not support IPv6) Do you know about any other special software, like written above? But: No Wiki No DNS No DHCP No spreadsheet Software should provide: Clear view of available addresses Detail listing of all addresses by subnets/search pattern/owners/additional info It must support adding additional info like owner of IP, domain-name, contacts, etc Multi user support Easy interface Software has to be specially written for address management. Scalability Any OS: win, lin, sol, web

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• Setting up routing for MS DirectAccess to a VMWare EsXi Host

  - by Paul D'Ambra

  I'm trying to set up DirectAccess on a virtual machine so I can demonstrate it's value and then if need be add a physical machine to host it. I'm hitting a problem because the Direct Access machine (DA01) needs to have 2 public addresses actually configured on the external adapter but there is a Zyxel Zywall USG300 between the VMware ESXi host and the outside world. I've summarised my setup in this diagram If I ping from the LAN to 212.x.y.89 I get a response but if I ping from the VM I get destination host unreachable. I used "route add 212.x.y.89 192.c.d.1" and get request timed out. At that point I see outbound traffic allowed on the Zyxel firewall but nothing coming back. I'm past my understanding of routing and VMWare so am not sure how to tie down where my problem lies (or even if this setup is possible). So any help massively appreciated. Paul

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• Dell powerconnect 6224 vlan routing

  - by user1007727

  I have a small network and I need help with routing .. . My VLANs VLAN 1010 SALES VLAN 1020 HR I have assigned the above vlans to a tagged port and I have added a default route to send the traffic of to my firewall. ip route 0.0.0.0 0.0.0.0 10.10.10.10 I have added a new vlan VLAN 1030 Services and I would like its traffic to go to a different interface on the firewall, 10.10.10.20 how can I go about doing that? can someone give me an example? your help is highly appreciated. Thank you

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• Ubuntu server - Problem of routing

  - by Max

  Hi, I have setup a Ubuntu server with Ubuntu Enterprise Cloud. The server is connected to a private LAN with DHCP and Internet access (via a gateway). At first, the server was working fine. It can ping the internet. It can also ping other machine inside LAN. The problem happened after i let the machine idle for more than 1 hour. When I want to use the machine again, I can't ping the internet anymore. I can only ping the machine inside LAN. I try to ping the server from another machine and it's working. Then, i ssh into that server from another machine, and I found that I can ping the internet from that server. It seems that there are some problems in the routing table of this server. Can anyone help me on this? Thank you. Max

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• Resolving real IP address out of a dynamic dns address

  - by stavnir

  I recently opened a dynamic dns user (at no-ip for that matter..) for my own personal needs and especially for ssh-ing my computer whenever I need to, without knowing it's static IP. My questions are: Am I misusing the concept of dynamic dns? Are there more appropriate methods to do what I want to do? If not, how do I resolve my router's real ip address? Firefox somehow manages to do so, nslookup and other similar commands only resolve the ip of the ddns server (e.g. no-ip.org). Trying to figure this mystery with wireshark failed miserably ;)

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• Blocking ports on the public IP assigned to lo interface in GNU/Linux

  - by nixnotwin

  I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned in the answer to the question linked above. The setup is working well. The only snag I have experienced is that I could not find a way to block the ports exposed by the public IP on the lo interface. I tried doing iptables -A INPUT -i eth0 -j DROP, and my server lost connectivity to the public network (internet). I could not ping any public ips. What I want is a way to block ports that are exposed by the public ip on the lo interface. And also I require iptables rules that can expose ports like 80 or openvpn port to the public network.

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• Cannot Ping a server after configuring the Routing and Remote Access Services

  - by stacker

  After configuring the Routing and Remote Access Services to be a both VPN and NAT service, I cannot ping that server anymore from the external side. But when I configure it to be just a VPN server, or just a NAT server, I do able to ping it from the external side. My configuration is like: DC: 192.168.20.11 VPN and NUT: Nic 1: 192.168.20.1, NIC 2: 192.168.147.171 Client: 192.168.147.1 The mask is always: 255.255.255.0 I cannot understand why when configuring the VPN server to be a VPN and NAT, I cannot ping the server anymore.

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• how to setup sonicwall tz210 to port forward packets received from external ip to another external ip

  - by lplp

  i have a sonicwall tz210 on a fixed ip, say ip1. And then i have, let's say a legacy server, with external ip ip2, which sends data to ip1 (and I have another server on ip1 behind the sonicwall which receives and processes that data). I would like to set up a new server on a different external ip ip3 that will receive and process data from the legacy server. How can I setup the sonicwall so that the packets received from the legacy server (from an external ip) are port forwarded to the external ip address ip3?

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• Automatically updating routing table on server

  - by bramp

  I have a LAN with three routers on it, one connected to the Internet, one VPN router connected to a few remote sites, and a final route connected to a private network (using BGP to get prefix advertisements). On the same LAN I have multiple Linux servers which needs access to the networks behind each router. I have achieved this by configuring static routes on the server, pointing the different network prefixes to the correct router. This has worked well, but every time we connect to a new remote VPN, we have to change all the servers to be aware that the network is now accessible via the VPN, and not via the default Internet route. What I want is a way to automatically update the routes on all of the servers, when the route is added to a routers. Now, I could install Quagga or something similar on all the servers to receive router advertisements, but that seems like overkill. So my question is what is the easiest/simpliest way to update the routing tables on the server automatically, and what protocol is best suited for this purpose. thanks

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• Routing table change to access Internet over mifi

  - by Randall Blake

  I have two networks at home. One uses a Verizon mifi wireless on 192.168.1.1. The other uses a dlink router on 192.168.0.1. I have one laptop with two nics, one wireless and one not. The wireless nic connects to the mifi. The Ethernet nic connects to the dlink router. It's ip is 192.168.0.2. I also have a laptop with only one nic connected to the dlink on 192.168.0.3. I want to connect laptop 2 to the Internet. Can I do that by adding an entry to the routing table so that destination 0.0.0.0 routes to 192.168.0.2? If I do that, will laptop 1 "know" that it should route traffic from 192.168.0.3 to 192.168.1.1? Thanks for any assistance.

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• Odd internet packet routing

  - by NachoChip

  I want to know is there anyway to explicitly control the packet routing. I try to connect my computer in HK from San Francisco. It is extremely slow and I use tracert to see what is going on. It seems the packet get routed from HK to Europe and then to New York and then to San Francisco. In US, I am using Astound Cable. Is there any suggestion I can force the packet to not go around the world before it reach my computer? Or it is all ISP dependent?

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• How to set IP address of Amazon EC2 instance to its Elastic IP?

  - by TWord

  Hi, I have an Amazon EC2 instance running and I am installing a program on it that needs to know what the machine's IP address is. Can I set the Elastic IP address to the IP address within the EC2 instance? Its okay if it reroutes data packets somewhere 'outside' and then back to itself, but the software NEEDs me to specify an IP address of the machine its on. I proceeded with the software installation using the "local IP" (10.xx.xx.xx) within the software installation. I don't know if this is the reason why the application is not visible publicly (as I'm trying to determine in the question http://serverfault.com/questions/166946/allowing-web-access-to-an-amazon-ec2-windows-server-2008-instance-running-tomcat)

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• ping alternative to measure routing distance (on Windows)

  - by Marco Demaio

  Hello, in order to measure aprroximately the rouitng distance (to see if a server is close to my country or too far away) I usually use ping command. I'm in Italy, when I ping Italian servers I get 36ms when I ping US EAST servers I get an average of 120ms when I ping US WEST servers I get an average of 200ms etc. Unfortunately some web hosters turn off the ping reply on their servers, so my question is how do I detect the routing distance, is there another easy to use command in Windows to accomplish the same task? Thanks!

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• Dial-in VPN Routing issue when on 192.168.x.x network range

  - by Ian

  I'm not an expert on networks but have a small office on the 192.168.x.x. range which is managed by a vigor (2800) router. I have enabled the VPN dial-in option on the router so I can get to the server on 192.168.1.100 which works fine from my macbook when i'm NOT on a local network with that is on the 192.168.x.x range. e.g. works fine when I tether over my Android smartphone but when I try & connect when on my home network, it connects, I can access the router (192.168.1.1) but cannot access 192.168.1.100 - traceroute doesn't hop via 192.168.1.1 I have enabled "send all traffic over VPN connection but again, not joy... Feels like the osx platform isn't routing the traffic out to the vpn endpoint as the destination address is on the local subnet but expect it would be. This work fine on a windows PC on the same home network. Any thoughts on what the issue could be?

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• Cannot acess the new cloned server even after new IP address assignment

  - by tough

  I was able to clone a Ubuntu 10.04 server residing in Cloud. It appeared that I was not getting some IP for the new VM so I followed some of these: # cd /etc/udev/rules.d # cp 70-persistent-net.rules /root/ # rm 70-persistent-net.rules # reboot I didn't follow the later commands as I was unable to see two eth MACs as available in the referenced site. After this I am able to see some the IP for it, and is different form the original IP, I have added new IP to DNS server. Now when I try to access it with its assigned(new) domain it is directed to the old server. I can see both the VMs running with different IP. Where I might have gone wrong, I am new to this admin thing.

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• ip routing policy in linux

  - by Dragos

  I have a linux system with two network interfaces (eth0 in x.x.x.0 and eth1 in x.x.y.0). Is there any posibility to add some route policy to send all the traffic to network x.x.y.0. I would like even the traffic from eth0 to be send to eth1's network. I cannot delete the direct connected networks from the routing table so all the traffic from x.x.x.0 network is send to eth0. I would like to send all traffic to eth1.

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• How can I compile an IP address to country lookup database to make available for free?

  - by Nick

  How would I go about compiling an accurate database of IP addresses and their related countries to make available as an open source download for any web developer who wants to perform a geographic IP lookup? It seems that a company called MaxMind has a monopoly on geographic IP data, because most online tutorials I've seen for country lookups based on IP addresses start by suggesting a subscription to MaxMind's paid service (or their less accurate free 'Lite' version). I'm not completely averse to paying for their solution or using the free one, but the concept of an accurate open source equivalent that anyone can use without restriction appeals to me, and I think it would be useful for the web development community. How is geographic IP data collected, and how realistic is it to hope to maintain an up-to-date open version?

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