Well I have now written a script that does this quite nicely. Only Solaris still rebels to seeing the ARP updates. Further investigation shows that Solaris is breaking the rules here so I'll not bother any more with it. Email me if you have a need for this. Cheers.........
On Sat, 28 Jun 1997, Richard L Shepherd wrote: > I wish to have 2 nearly identical machines. Each will have it's own IP > number plus an IP alias. The idea is that I wish to occasionally take 1 > down and give it's IP alias over to the other machine, so that there is no > visible change to any clients. > > The problem is that machines on the localnet may have an entry in their > ARP tables with the ethernet address of the old machine at the time of the > changeover, and so be unable to reach the new holder of that IP number. > It is necessary for the new machine to send some packets with a source > address of the new alias it has taken on so that local hosts will see the > new ethernet address and update their ARP tables appropriately. > > The only way I've found to do this is to alter the routing so that the new > IP alias becomes the gateway to the localnet. (host routes are then added > for the primary IP address to restore that part of things) Outgoing > packets will now have the right source address. It sends some packets out > and then switches the routing back to normal so that the IP alias is ready > to be given back. This seems to work OK, but I'd really rather not stuff > with the routing, so: 8<--------------------------------------->8 Richard Shepherd ([EMAIL PROTECTED]) 8<--------------------------------------->8 -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word "unsubscribe" to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
