Gratuitous ARP

[Colin Farley]

   Hi all,



   I am using UCARP on two FreeBS   highly available apache virtual hosts.&nb   work very well except that occasionally one webserv   inaccessable from outside it's subnet.  I have narrowed   an arp issue.  When a UCARP IP becomes unavailable.    start a constant ping to it from my machine which lives on a d   ifferent subnet, all requests timeout.  I log into the cisco router
   th   view th   listed for that   clear the arp cache   table update correctly aft   the webserver is again accessible 


   So, I have come up with a few    include:



   1.&nbs   that outages a   problably stress th   about cisco devices so   think that this is a bad th   cache arp entries on just the   currently consists of about 25 hosts    all?

   2.  Run an ANT task to    task can become part of the UCARP   solution but security is a concern.

   3.  Find a way to make the FreeBSD nodes produce more than usual   gratuitous arp packets or add a line to do only that in the UCARP
   scripts.   may be able   sometimes d   Could it be a p   properly?

   &
   Any input at all is greatly appreciated.



   Thanks,

   Colin