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? Jerry
Hi, On Thu, Jul 16, 2009 at 15:53, Jerry Geis<geisj at pagestation.com> wrote:> 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?You can use the "arping" command to send an unsolicited ARP message to the other hosts on your local network. See "man arping". HTH, Filipe
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