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Accepted
Paul Hoffman
Asked: 2011-02-06 20:13:18 +0800 CST

How do I configure an interface to have *both* a DHCP address and a static address in Ubuntu?

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In a lab setup, I want eth0 on a Ubuntu server box to get a DHCP address for talking to the outside world, and I also want to assign it a static 10.x.y.z address for talking to other boxes on the local network that have 10.x.y.z addresses. I want to do this by editing /etc/network/interfaces.

The man page for /etc/network/interfaces is modeled after "here's a bunch of examples, I hope you can figure out the actual rules on your own". I don't see a way to give one interface two addresses using two different methods (static and dhcp), and initial fumbling didn't produce useful results.

ubuntu networking interface

2 Answers

  1. Best Answer

    You use eth:N notation for that.

    auto eth0
iface eth0 inet dhcp

auto eth0:0
iface eth0:0 inet static
        address 192.168.32.10
        netmask 255.255.255.0
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  2. ip can add multiple addresses to an interface.

    iface eth0 inet dhcp
    up ip addr add 192.168.32.10/24 dev eth0
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