Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have installed ubuntu server 11.04 edition (with LAMP, mail server, and SSH server) and I try to connect to the internet. When I plug the cable from my ISP with the configuration provided below to a router and then back to my server the connection works fine, but when I try to put the cable directly to my server without the router, with the same information configuration the internet connection doesn't work any more.


eth0 Link encap:Ethernet HWaddr 00:12:79:a5:0b:39
inet addr: Bcast: Mask:
inet6 addr: fe80::212:79ff:fea5:b39/64 Scope:Link
RX packets:5697 errors:0 dropped:1854 overruns:0 frame:0
TX packets 34 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:467192 TX bytes:2594

In /etc/network/interfaces:

auto eth0
iface eth0 inet static
mac:00 0E A6 41 C6 38.
share|improve this question
Could you also paste the output of 'ip route show'? – ajmitch Oct 3 '11 at 7:29
1 dev eth0 proto kernel scope link src default via dev eth0 metric 100 dev eth0 proto kernel scope link src default via dev eth0 metric 100 – Oct 3 '11 at 7:41
How do you connect with your static connection to the internet? Do you have a router in the middle, modem, anything? I dont belive your ISP installed a cable straight to your home to share their private network with you ;) Tell me more about your network, where is what connected, how many NICs you have output your ifconfig -a with the dynamic net and the static one connected. – Bruno Pereira Oct 3 '11 at 7:43
Can you write down what your ISP said it would be your IP address, gateway IP and DNS servers? Do you have only 1 NIC? (So 1 card, 2 different connections?) – Bruno Pereira Oct 3 '11 at 8:41
up vote 4 down vote accepted

The line stating the IP address for the DNS server in /etc/resolv.conf should read


rather than being the IP address of the gateway (, if that is what the ISP says the DNS server should be.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.