Linux Routing Default Gateways

[JARiley at dstsystems.com]

your one and only default route is for any traffic that does not have a 
specific route set to follow.  So, if you want certain traffic to go out a 
specific interface, you must create static routes in your table.

examples:

# route add  -net 192.168.5.0 netmask 255.255.255.0 eth0
netmask can be left out since 192.168 is a Class C by default.

# route add -host 192.168.6.6 eth0

that's it.


James Riley, CISSP 




sirsky <sirsky at gmail.com> 
Sent by: kclug-bounces at kclug.org
05/23/2005 11:24 AM
Please respond to
sirsky <sirsky at gmail.com>


To
List - KCLUG <kclug at kclug.org>
cc

Subject
Linux Routing Default Gateways






I'm having a problem getting proper default gateways set up on my
Gentoo server...here's the scenario:

Linux Server with 2 ethernet interfaces.

eth0: 192.168.1.0 (internal)
eth1: 172.16.0.0 (dmz)

Here is my current routing table:

192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.5
172.16.0.0/16 dev eth1  proto kernel  scope link  src 172.16.0.2
127.0.0.0/8 via 127.0.0.1 dev lo  scope link
default via 172.16.0.254 dev eth1  metric 1

I guess, what I need to know, is how do I set up my routing tables so
that traffic coming and going along eth0 uses the default gateway of
192.168.1.254 and traffic coming and going along eth1 uses the default
gateway of 172.16.0.254?

I can easily set up a 'default gateway', but I can only do one...so
traffic coming in on 192.168.1.5 is still going out via
172.16.0.254...

I have a Windows 2003 server already working in this
configuration...here is it's routing table:

Active Routes:
Network Destination        Netmask          Gateway       Interface Metric
          0.0.0.0          0.0.0.0     172.16.0.254       172.16.0.3 10
          0.0.0.0          0.0.0.0  192.168.230.254    192.168.230.3 10
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1 1
       172.16.0.0    255.255.255.0       172.16.0.3       172.16.0.3 10
       172.16.0.3  255.255.255.255        127.0.0.1        127.0.0.1 10
   172.16.255.255  255.255.255.255       172.16.0.3       172.16.0.3 10
    192.168.230.0    255.255.255.0    192.168.230.3    192.168.230.3 10
    192.168.230.3  255.255.255.255        127.0.0.1        127.0.0.1 10
  192.168.230.255  255.255.255.255    192.168.230.3    192.168.230.3 10
        224.0.0.0        240.0.0.0       172.16.0.3       172.16.0.3 10
        224.0.0.0        240.0.0.0    192.168.230.3    192.168.230.3 10
  255.255.255.255  255.255.255.255       172.16.0.3       172.16.0.3 1
  255.255.255.255  255.255.255.255    192.168.230.3    192.168.230.3 1
Default Gateway:      172.16.0.254

Any help would be greatly appreciated...I'd really like to get this
2003 server out and this new Linux server in it's place...

Thanks,

-Lucas
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