Mailinglist Archive: opensuse (1495 mails)

[Anders Johansson <ajohansson@xxxxxxx>]

> On 3/31/09 8:50 AM, "Chris Arnold" <carnold@xxxxxxxxxxxxxxxxxxx> wrote:
> > Using SLES10 SP2 and need to get multi-nic configured correctly. 1 nic is
> > on a network and the other nic is on another network. Using yast->routing
> > what is the correct way to configure this 2 nic (on the 192.168.123
> > network)? When I put in the expert config section of routing, dest
> > 192.168.123.0 and give it a gateway of the 192.168.123 network,
> > somethings stop working. So my question is how is a dual nic system
> > suppose to be setup using routing?

It depends on what you want to achieve. Normally you don't have to do 
anything. One NIC is on one network, with a netmask, so all packets destined 
for that network will automatically go through that NIC. The other NIC is on 
another network, again with a netmask, so all packets destined for that 
network will automatically go through that NIC.

And then the system has one default gateway, which is on one of the two 
networks, so it will be automatically found, and used for all packets destined 
for machines not on one of the two local networks.

For most setups, this will happen absolutely automatically when you assign 
addresses to the two NICs. The only problem I have seen is when people think 
you should have more than one default gateway, which you shouldn't have.

If you want anything more complex than this, then you need to study up on 
routing.

If 192.168.123.0 is one of the two local networks, it doesn't need a gateway. 
A gateway for a network is a machine through which you go when trying to get 
to a non-local subnet

Anders
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