[H-GEN] Network Failover stuff

[Edwin Groothuis]

On Thu, Jun 03, 2004 at 09:52:14PM +1000, Michael Anthon wrote:
> I have been asked today to investigate network redundancy type stuff for 
> one of my servers.  The IT bods in our main office (Sydney) are 
> rehashing the main routers and DMZ configuration.  The new config will 
> have 2 Cisco 3750s.  I need to hook the built in GigE NICs to the 
> routers (one each obviously). 

What will be the network? Will it be like this:


                    | Your machine
           -------------------------- Your lan
	      | Router 1    | Router 2

Or will it be:

	      | Router 2
           -------------------------- Lan 1
		    |
               Your machine
		    |
           -------------------------- Lan 2
	      | Router 1

In the first one, there is not much you can do (easily)

If you can do dynamic routing, do it:
- put the public address on the loopback interface (as an alias).
- start exchanging routing information with the routers.
  (let the machine figure out its default gateway, and advertise
   your public address)

If router 1 fails, router 2 will take over as default gateway thanks
to the routing exchange.

This is how we have all our servers.

Edwin

-- 
Edwin Groothuis      |            Personal website: http://www.mavetju.org
edwin at mavetju.org    |          Weblog: http://weblog.barnet.com.au/edwin/