failover routing with quagga? (OSPF, BGP,RIP,...)

[Thomas König <taroon tom at>]

Hi,

we need to implement failover routing on a gateway running RHEL 3. It is
attached to 2 ISP. If one connection goes down all packets should be
routed via the other ISP.

The gateway has 3 nic's:
eth0: LAN (intranet IP-Address)
eth1: Primary-ISP (regular IP-Address)
eth2: Backup-ISP (regular IP-Address)

Both Internet connections are permanently up.

I found the quagga package which provides services to handle routing
protocols like ospf, rip, bgp,...

Unfortunately I'm not familiar with these protocols.

Could a service from the quagga package do the job for me, or do I have
to write some bash script which pings on each interface and change the
default route if some pings fail?

I don't have access to any routers on the next hops nor do I get any RIP
or OSPF broadcast packages on the external interfaces which might be
needed for quagga to work.

Any pointers or suggestions?

thanks
Thomas

--
Thomas König
linuxIT König OEG
http://www.linuxit.at/