--On Wednesday, September 14, 2011 03:37:34 PM -0600 Devin Reade <gdr at gno.org> wrote: > Have a look at arping(8) and it's -U flag in particular rather than ping. Sorry, I should have said the -A flag. FWIW, gratuitous ARP is the mechanism used by Linux-HA when dealing with IPs moving between nodes. For example: arping -A -c3 -I eth0 YOUR_IP Devin