Triple-homed default card?

Hi all,

I'm trying to set up a small cluster of FC3 machines to perform some protocol research. Each of the machines has three network cards, eth0, eth1 and eth2.

On every computer, eth0 is physically connected to a NAT router, and uses an assigned IP address (no DHCP). eth1 & eth2 are connected to isolated internal networks.

My issue:
On some computers, when I try and ping an outside IP address (accessible via the router), I have no issues. On others, however, ping tries to use eth1 or eth2, and of course can't find the address since these networks are isolated - I get a "Destination Host Unreachable" error. If I try to specify the interface using ping -I eth0, I get "Operation not permitted".

Basically, the big problem with this is that I'm trying to download code from an external CVS, and on the computers that can't ping the server, I can't connect to CVS either.

How do I specifiy which ethernet card to use as default? What am I missing here?

Thanks!

You're missing the kernel routing table.

As root, type 'route' to see your existing table. Make the ones that don't work look like the ones that do.

Yeah, that solves it. Thanks!

How do I make the changes to the kernel routing table global and permanent? It reverts every time I reboot.

Honestly, I'm not sure how Fedora has its init scripts structured. If you have an /etc/rc.local or /etc/rc.d/rc.local or something along those lines, try putting it at the end of it.

I ended up altering these files:

/etc/sysconfig/network-scripts/ifcfg-eth0
/etc/sysconfig/network-scripts/ifcfg-eth1
/etc/sysconfig/network-scripts/ifcfg-eth2

so that eth1 & eth2 no longer have a specified gateway. Problem solved.

cool. Glad its working for you.