[ale] failover planning

[kaboom at gatech.edu (Chris Ricker)]

On Tue, 30 Nov 2004, Christopher Fowler wrote:

> I've set 1 in all/arp_filter and each interface but the box is still
> responding.
> 
> I even deleted arp tables on my desktop to see if that was the problem. 
> Maybe I need to set something else?

Note that the kernel sysctl docs say something like "you must use 
source-based routing for this to work."

With default routes, you've got something like:

...
192.168.2.0      0.0.0.0         255.255.255.0   U         0 0          0  eth0
192.168.2.0      0.0.0.0         255.255.255.0   U         0 0          0  eth1
...

on your server, and even with arp_filter enabled on both eth0 and eth1, the
machine is perfectly correct in sending ARP responses for either
192.168.2.120 or 192.168.2.121 out either of eth0 or eth1.

later,
chris