need help with bridging

Hello

I have a 3(2-2) computer network with this setup:

PC1 PC2 PC3
NIC 1 NIC1 NIC1
192.168.0.1 192.168.0.2 192.168.1.1
NIC2
192.168.1.2

I want to establish communication between PC1 and PC3.
In Windows XP I can do it through *bridging*.

But how to do it in Linux? I think I need to add
some route in PC2.

I dont want to buy an extra router.

--
Madhur Ahuja [madhur<underscore>ahuja<at>yahoo<dot>com]

Homepage
http://madhur.netfirms.com

Madhur Ahuja schrieb:
> Hello
>
> I have a 3(2-2) computer network with this setup:
>
> PC1 PC2 PC3
> NIC 1 NIC1 NIC1
> 192.168.0.1 192.168.0.2 192.168.1.1
> NIC2
> 192.168.1.2
>
> I want to establish communication between PC1 and PC3.
> In Windows XP I can do it through *bridging*.
>
> But how to do it in Linux? I think I need to add
> some route in PC2.
>

If the network is *secure* and you can trust in your clients, just set
PC2 as default-Gateway and /proc/sys/net/IPv4/ip_forward to 1.
Everything will be forwarded.
An alternate method would be setting up the iptables, but this would be
much more work

Madhur Ahuja wrote:
> Hello
>
> I have a 3(2-2) computer network with this setup:
>
> PC1 PC2 PC3
> NIC 1 NIC1 NIC1
> 192.168.0.1 192.168.0.2 192.168.1.1
> NIC2
> 192.168.1.2
>
> I want to establish communication between PC1 and PC3.
> In Windows XP I can do it through *bridging*.
>
> But how to do it in Linux? I think I need to add
> some route in PC2.
>
> I dont want to buy an extra router.
>
> --
> Madhur Ahuja [madhur<underscore>ahuja<at>yahoo<dot>com]
>
> Homepage
> http://madhur.netfirms.com
>

Assuming thet there are no connections to the outside Internet:

You need to enable IP forwarding in PC2:

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

The hosts PC1 and PC3 need to know how to reach the
far end subnet:

In PC1:

route add -net 192.168.1.0/24 gw 192.168.0.2

In PC3:

route add -net 192.168.0.0/24 gw 192.168.1.2

HTH

Tauno Voipio
tauno voipio (at) iki fi