Hi,
I have two internet links, from different ISPs for my office network,
each one with it's own router (which is a linux PC) so I don't loose
internet connectivity easily. One ISP has a much higher bandwitch, so
usually all my computers use it as the default gateway. The other one is
intended as a contingency link.
Today I have to manually change the default gateway on all computers
when the main link goes down. I want an automated way to do this.
All how-to's I could find on google were such as:
http://www.generationip.com/documentation/network-documentation/93-howto-setup-multiple-default-gateway-on-linux
Where they use iproute2 so a single router/computer can switch between
two internet links. While I can undersand this scenario, the single
computer becomes a single point of failure. I don't want to setup a
"cluster" using heartbeat, cluster suite and similars just to provide a
router failover. It looks overkill.
Other problem, all iproute2 samples I find thave those two gateways on
different subnets and use the source address to route properly and avoid
problems like "onion routing".
I'd like to have two routers/computers on the same subnet, each one
connected to it's own internet link, and have the network computers
switch from the main one to the contingency one when needed.
So a computer would have two default gateways on the same subnet. I
can't find how to change the iproute2 samples setup so the gateways can
be on the same subnet and everything works. I allways end up having all
traffic going though one link and when it fails I loose internet
connectivity.
[]s, Fernando Lozano
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