Making Static Routes Persistent

Problem

You don’t want to have to retype all those route commands every time there’s a power blip, or when you make hardware changes. Aren’t there some nice configuration files for permanently enshrining your static routes?

Solution

Of course there are. On Debian, add them to /etc/network/interfaces in the stanza for their corresponding interface:

auto eth1
iface eth1 inet static
address 192.168.10.100
netmask 255.255.255.0
gateway 22.33.44.55
broadcast 192.168.10.255

up route add -net 172.16.5.0/24 gw 192.168.10.100 eth1
up route add -net 172.24.0.0/24 gw 192.168.10.100 eth1
down route del -net 172.24.0.0/24
down route del -net 172.16.5.0/24

On Fedora, create a /etc/sysconfig/network-scripts/route-* file, like this:

# /etc/sysconfig/network-scripts/route-eth1
192.168.10.0/24 via 172.24.0.25
172.16.5.0/24 via 172.24.0.25

This uses ip command-type syntax. It is important to use the correct filename, with your correct device name, or it won’t work. Take the device name from its own configuration file, like /etc/sysconfig/network-scripts/ifcfg-eth1.

Discussion

On Fedora, don’t use /etc/network/static-routes. That was deprecated several releases ago, and no longer works.

Your routers will need a default gateway if there is another route out of your network, like an Internet connection. If there is no Internet or link to another separate network, they won’t need default gateways.

See Also

• man 5 interfaces (Debian)
• man 8 ifup (Debian)
• man 8 ip



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