Ubuntu – How to configure a static IP address, but DNS via DHCP

bootdhcpdnsnetworkingserver

I've configured a static IP address in file /etc/network/interfaces:

auto eth0
iface eth0 inet static
    address 10.152.187.122
    gateway 10.152.187.1
    netmask 255.255.255.0

But I'd like DNS to be configured automatically with DHCP. For example, if I run dhclient, it populates /etc/resolv.conf properly. But I would like this to run at startup, and I'm not sure where the proper way to set that up.

This is on the Ubuntu 12.04 (Precise Pangolin) cloud image.

Best Answer

With DHCP, you get the DNS nameserver addresses that the router gets when it gets an IP address from your internet service provider (ISP). You can use the DNS nameserver addresses the router has like this:

auto eth0
iface eth0 inet static
  address 10.152.187.122   
  netmask 255.255.255.0
  gateway 10.152.187.1
  dns-nameservers 10.152.187.1

Related Solutions

Ubuntu – How to add an IP alias on a bridged interface

Add the next lines to your br0 configuration (e.g. after bridge_fd 0):

up /sbin/ip addr add 10.0.2.254/24 dev br0
down /sbin/ip addr del 10.0.2.254/24 dev br0

When the interface is brought up, the IP address 10.0.2.254 is added to device br0. Similarly, the address is removed when the interface goes down.

Ubuntu – System loses static IP address

Recently I stumbled on this problem and after some investigation it turned out that /etc/dhcp/dhcp.conf needed a block to be added, (or uncommented,) similar to this:


alias {   interface "eth0";   
fixed-address 10.1.1.1;   
option subnet-mask 255.0.0.0; }

Hope this helps!

Regards, Glendon Gross

Best Answer

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Ubuntu – How to add an IP alias on a bridged interface

Ubuntu – System loses static IP address

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