topic Re: two links and two NICs in Operating System - Linux

two links and two NICs

Ragu_3 — Fri, 24 Sep 2004 02:36:32 GMT

There are two network adapters eth0 and eth1 in one of the servers here. Both the NICs are connected to the Internet via 2 different ISPs on each of them. Is there any tool in Debian GNU/Linux where I can specify and prioritize the link to be used, preferably a CLI tool? TIA.

Re: two links and two NICs

Steven E. Protter — Fri, 24 Sep 2004 04:09:24 GMT

Network configuration can deal with that.

I'm not sure of the Debian location but there is a file called ifcfg-eth0 and ifcfg-eth1

On my boxes its in the /etc/sysconfig/network-scripts folder

A gateway statement will set internet priority. You are probably not going to want two, but you may.

gateway=ip_address_from_isp

if eth0 has a gateway and eth1 does, all Internet outbound traffic will use eth0

SEP

Re: two links and two NICs

Slawomir Gora — Fri, 24 Sep 2004 05:09:07 GMT

Hi,

I think that you can only properly set your
routing table - I meen one set of dest networks by ISP1 and second set of dest. networks by ISP2.
You have to check which ISP is better for which dest. networks and add add static routes.

Re: two links and two NICs

Don_89 — Mon, 27 Sep 2004 10:19:19 GMT

Steve is correct here. The gateway address defines where the packets go. If you have 2 ISP's, your router should be running BGP which will determine the best route.