Need routing help

[SLG]

I am trying to setup a linux firewall/router. I have three interfaces:
eth0-internal (1.1.1.1)
eth1-external (2.2.2.2)
eth2-backup (3.3.3.3)

Everyone connects to the 2.2.2.2 address all of the time except when it happens to go down. Then they connect to the 3.3.3.3 address. Here is the problem; I have one user that is one the 3.3.3.3 subnet that can not connect. We'll say his address is 3.3.3.4. I know all I need is a route but I've never been very good at setting up routes.
I want him to use the primary 2.2.2.2 all of the time except when it is down like everyone else.

Thanks in advance!

 

[Gloups]

Try to do something like


route add -net 1.1.0.0 netmask xxx.xxx.xxx.xxx gw 2.2.2.2 metric 0

route add -net 1.1.0.0 netmask xxx.xxx.xxx.xxx gw 3.3.3.3 metric 1


Note that 1.1.xxxx network adress and netmask depends on your own config

 

[SLG]

Would this be in addition to haveing a default GW of 2.2.2.1?

 

[Gloups]

That replace the default gateway. Addind two different routes, you can use the metric to have a second route to the same net not used in normal operation

 

[SLG]

Thanks! I'll give it a shot