Static Routing in Linux

suvajit · 05-15-2003, 06:03 AM

Hi All ,
I have one more question ...

I have three Nic cards (eth0,eth1,eth2) in my linux box and I am using this box as a Router.

Eth0 -->192.168.150.1 /24 for 192.168.150.XXX subnet ..
Eth1 -->192.168.151.1 /24 for 192.168.151.XXX subnet ..
Eth2 -->192.168.152.1 /24 for 192.168.152.XXX subnet ..

How do I enable static routing so that computer in other subment can communicate with other subnets .

execting an speedly reply from you ....

Thanks in Advance,
Suvajit .....

jharris · 05-15-2003, 06:16 AM

You shouldn't need to do anything as the routes for each subnet will be setup automatically when you add the interface. If you want to forward packets between the interfaces then you'll need to run

Code:

echo "1" > /proc/sys/net/ipv4/ip_forward

cheers

Jamie...

suvajit · 05-15-2003, 06:40 AM

Hi
Can you pls let me know what all the paramiter or ( syntex ) in ip_forward file?

- Suvajit

acid_kewpie · 05-15-2003, 06:43 AM

it isn't a file, there is not format, it's just a method of setting a value in the kernel to 1 or 0 (on or off)

jharris · 05-16-2003, 02:54 AM

Just to expand kewpie's comments - the command I posted originally is literally what you need to run. This won't control any aspect of what packets get sent where, or which interface will accept which packets, or any kind of firewallling. It simply means that if a packet attrives at your linux box that is destined for another machine it will forward it out whichever interface its routing table indicates it should use.

cheers

Jamie...