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Erik I
Asked: 2009-08-05 01:12:38 +0800 CST

Setting a temporary ip address and gateway on linux server

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I have a linux server which needs to be set up with production ip address and hostname before installation procedures start (some scripts use these variables).

I've seen somebody assigning a temporary ip address and a temporary gateway simply by typing a couple of commands, but I can't remember.

linux ip-address

4 Answers

  1. Best Answer

    ifconfig is deprecated, but it still works.

    The "correct" way would be:

    sudo ip addr add <extra ip> dev eth0:0
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  2. Think I found it, but it might be worth sharing anyway:

    ifconfig eth0:0 <extra ip> up
sudo route add default gw <gatewayip>
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  3. I just want to add something on blauwblaatje's answer. https://serverfault.com/a/49651/575693

    sudo ip addr add <ip/cidr> dev eth0

    If you don't put cidr notation, the host will be configured as host only or /32. Hence, you won't be able to communicate with other machine.

    Avoid the following example unless you don't need networking. E.g.

    sudo ip addr add 172.16.1.1 dev eth0

    same as

    sudo ip addr add 172.16.1.1/32 dev eth0

    Instead, define your subnet based on your requirement, let say Class C or /24

    sudo ip addr add 172.16.1.1/24 dev eth0
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  4. The command will add an alias to the interface so yes it is in addition to the current one. If you need to add a netmask then the command would look like:

    sudo ifconfig eth0:1 <ip> netmask <mask> up

    Otherwise ifconfig will use the default for the Class the IP belongs to e.g. 255.255.255.0 for Class C

    Just be careful with the default route option. You generally only want one default route so you may want to remove the current default route before adding the new one, otherwise play around with the metric on the route.

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