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At some point I tried to set up VPN on my home server, but couldn't get it to work. So I finally decided to roll the setup back (uninstalled openvpn) as I didn't really need it, but now the server cannot access the internet (though it is reachable from and can see the local network). By cannot access the internet I mean that I cannot ping neither ip's nor addresses or use e.g. nslookup.

I asked a colleague and he's guess was that the problem was in the routing table. The output from route on the broken system is:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.0.1     0.0.0.0         UG    100    0        0 eth0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0

and the output from another functioning machine on the same network is:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
link-local      *               255.255.0.0     U     1000   0        0 eth0
192.168.0.0     *               255.255.255.0   U     1      0        0 eth0

Just in case the routing table isn't the problem in this pastebin is the output of several networking commands that may be useful in troubleshooting: http://paste.ubuntu.com/6071536/ and the /etc/network/interfaces is http://paste.ubuntu.com/6071566/ (there is some static IP stuff in there that I disable during the trouble-shooting)

Can any of you help me fix the system. I will gladly provide any further needed information.

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Can you define what you mean by "cannot access the internet"? Can you not ping external hosts at all, or can ping by IP but not name? Apologies if I missed that in your pastebins. –  steeldriver Sep 6 '13 at 18:59
    
Ah, you are right I don't think that information was in the pastebins. I cannot ping neither ip's nor addresses or use nslookup. I will add it to the question. –  TLE Sep 6 '13 at 19:08
    
@TLE - we can no longer merge accounts automatically for you. However, click the contact-us link at the bottom of this page with your registered account, and you'll be able to request a merge of your unregistered accounts. Thanks. –  fossfreedom Sep 23 '13 at 22:33
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1 Answer

up vote 1 down vote accepted
+50

It seems like something else is reconfiguring your system after it has set up the network tables. Do you have an extra route call somewhere from when you set up OpenVPN, in /etc/network/interfaces or in another /etc/network/ script?

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I can't believe it was that simple. There was no route calls anywhere there. But while looking around in the folders in /etc/network I noticed that there were still openvpn folders there and realized that I had not done a purge. After I did that, I once again have network. Thanks for pointing me in the right direction. –  TLE Sep 30 '13 at 21:32
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