[CentOS] passing alias addresses

Fri Jul 17 03:42:49 UTC 2009
Les Mikesell <lesmikesell at gmail.com>

Jerry Geis wrote:
> hi all,
> When using the alias address scheme,
> like eth1:0 on a machine ... things are working.
> When that interface is disabled on box A and becomes active on box B
> what should Box B do to correctly update the ARP tables external to box B
> so the external world knows how to get to the new destination and not 
> the old box A?

Hosts on the same subnet usually figure this out quickly, but routers may cache 
arp values for 20 minutes or so.   If you are doing this to move a service to 
keep it highly available, you might like the 'heartbeat' package which will 
takes care of the details of moving an IP address for you.

   Les Mikesell
    lesmikesell at gmail.com