How can I add a route on a RHEL3 Linux machine:
for example, I like to route to host CDIOC1 (134.79.185.200) via
RTR-SLCCP2 (172.19.55.6)?

I am doing right in the following:

On command line:
route add -host 134.79.185.200 gw 172.19.55.6 dev eth0

To activate at reboot:
Create a file /etc/sysconfig/static-routes that contains one line in
the form
eth0 host 134.79.185.200 gw 172.19.55.6 eth0

Thanks,
Jingchen