Linux route command. Two gatways on the same subnet range

linuxroutesubnet

I have a Linux box with two interfaces.
eth0 has ip 192.168.71.82/255.255.252.0
eth1 has ip 192.168.4.2/255.255.255.0
I need all traffic for subnets 192.168.4.0/24 192.168.3.0/24 192.168.2.0/24 to go through eth1 and all the rest to go through eth0.
Which is the best way to do this?
route command?
Cheers for the help.

Best Answer

Just set routes to your desired Networks over eth1:

route add -net 192.168.4.0 netmask 255.255.255.0 dev eth1
route add -net .........

And then set your default gateway to whatever you need:

route add default dev eth0

(Nevertheless a route using an interface looks a bit strange to me - usually you should address the gateways using the correct router(s):

route add -net 192.168.3.0 netmask 255.255.255.0 gw <your routers IP>

Related Solutions

Linux – How to set the preferred network interface in linux

Your network routing table will determine how the packets are routed. You can add additional routes or change the default gateway to affect the routing.

If you would like additional assistance, please provide your routing table.

To display the routing table:

/sbin/route -n

To delete default gw:

/sbin/route del default gw $IP

To add default gw:

/sbin/route add default gw $IP

For additional details, check out the manpage. There are other ways to manipulate and display the routing table as well.

netstat -r to display and ip to manipulate further.

Linux – How to use suse linux as a small router

You need at least one other step:

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

I don't think you need the explicit route commands above. Simply setting up the two interfaces and allowing forwarding should satisfy your routing requirement.

Check the output of your routing table with:

netstat -rn

Best Answer

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