I have a business class internet connection and need to setup a static ip address for a machine. I did a search online and only find how to setup static local ip addresses (like 192.168..). I tried the same technique, and only setup the ip address and netmask, but after restart networking the computer could not connect to the outside world.

This is what I did:

1) edit /etc/network/interfaces iface eth0 inet static address 173.10.xxx.xx netmask

2) edit /etc/resolv.conf search wp.comcast.net nameserver xx.xx.xx.xxx nameserver xx.xx.xx.xxx

3) restart network sudo /etc/init.d/networking restart

Now the last step didn't report error, ifconfig shows the ip address was set, but this server cannot connect to outside world, ping google.com and reports "unknown host google.com".

Any ideas?

  • 1
    Are you connected directly to the cable modem, or behind the router?
    – Zypher
    Apr 15, 2010 at 23:13

1 Answer 1


You are missing a default route.

In ubuntu, you'll need:

 gateway <IP of default route>

Here is /etc/network/interfaces on my system (with a private IP, but there is no difference):

auto eth0
iface eth0 inet static
    # dns-* options are implemented by the resolvconf package, if installed
    dns-search example.com
  • Oha, it works now! It turns out I need to specify the gateway with the public IP address of the router. It didn't work earlier because I am setting an public ip for the server, but using a local LAN ip for the gateway.
    – ycseattle
    Apr 15, 2010 at 23:35

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