On Wed, Nov 30, 2011 at 11:22 PM, Lamar Owen <lowen at pari.edu> wrote: > So be prepared to clear ARP caches (since gratuitous ARP is sometimes seen as an attack vector, although it works quite well for VMware vMotion, DRS, and HA) and CAM/TCAM entries if things go awry. > > The RPMforge/repoforge repository includes the 'garp' package; on the new gateway you could have this garp package installed, and then run garp with the IP address of the old gateway immediately after stopping the old gateway's interface, and that might work. But caution is advised, and YMMV, of course. Thanks all for all the insights from your experience. Much appreciated. I will do it during weekend when no users are working. (this creates the saying about sysadmin: people work, we work. people rest, we still work).