route newbie question

Sorry this is such a newbie question but here goes.

I am told by my net admin that I need to use the following info to
setup a persistent route on my RHES3 box.

I tried
route add -net gw eth2
I get error "SIOCADDRT: network unreachable"

My box with netmask of on eth2

One of the IP's I need to talk to:

Subnet IP and other sit:

Router Address I was told to use:

My guess is that route is complaining since the gateway is not in the
subnet I am trying to reach. But I am told that this is the correct
address to use.
I have read a couple posts that say I maybe should look at using the
ip command to get this working?