HP-UX

I am running HP_UX 11.23 with 4 NIC cards (this is our TSM server)
I have 4 subnets we are backing across. trying to keep traffic on their subnets. I only have one route statment should I add more.
route add net 123.99.8.0 netmask 255.255.255.0 123.99.8.254
route add net 123.99.67.0 netmask 255.255.255.0 123.99.67.254
route add net 123.99.65.0 netmask 255.255.255.0 123.99.65.254


# ifconfig lan0
lan0: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 123.99.3.234 netmask ffffff00 broadcast 123.99.3.255
# ifconfig lan1
lan1: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 123.99.67.234 netmask ffffff00 broadcast 123.99.67.255
# ifconfig lan2
lan2: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 123.99.65.234 netmask ffffff00 broadcast 123.99.65.255
# ifconfig lan3
lan3: flags=1843<UP,BROADCAST,RUNNING,MULTICAST,CKO>
inet 123.99.8.234 netmask ffffff00 broadcast 123.99.8.255

# netstat -nr
Routing tables
Destination Gateway Flags Refs Interface Pmtu
127.0.0.1 127.0.0.1 UH 0 lo0 4136
123.99.3.234 123.99.3.234 UH 0 lan0 4136
123.99.8.234 123.99.8.234 UH 0 lan3 4136
123.99.65.234 123.99.65.234 UH 0 lan2 4136
123.99.67.234 123.99.67.234 UH 0 lan1 4136
123.99.3.0 123.99.3.234 U 2 lan0 1500
123.99.67.0 123.99.67.234 U 2 lan1 1500
123.99.65.0 123.99.65.234 U 2 lan2 1500
123.99.8.0 123.99.8.234 U 2 lan3 1500
127.0.0.0 127.0.0.1 U 0 lo0 0
default 123.99.3.254 UG 0 lan0 0

Have you filled correctly /etc/rc.config.d/netconf file?
After the stanzas for your multiple lans, there is another section
for all the routings for EACH lan you have (lan[0] [1] etc) you will have to copy the block and configure for each lan interface if not yet done...

You do not need special routes for these. They get automatically created when you add the interface.

Think about it.. how do I get to the 12399.8.0 net, I go out the 123.99.8.234 interface.

The only route that counts in your config is the default going down 123.99.3.234 interface

If traffic from some other net ( e.g 192.168.4.1 )comes in on the 123.99.8.234 net it will be returned to the router via the 123.99.3.234 LAN unless you add a statement like this.

route add 192.168.4.0 123.99.8.254 1

It is the extranets you want to set the routes for. Same nets will always go out the proper LAN and get routes added automatically as part of ifconfig.