We have our main site and DR site.
We have a bridged subnet from the main site to the DR site.
The routers across the wan connection are the bridge interfaces and the default gateways for the brdged subnbet.
There is a windows machine that under normal operation is in the Main site.
If it fails, the DR site machine is brought live with the same IP address.
My questions is regarding arp.
The router that is holding the arp table for this machine ( the bridged interface and default gateway)has a 4 hour arp timeout.
If the machine does not do anything, then this arp table stays intact for 4 hours correct?
so, if I take down the main site machine and bring up the dr side machine, the DR side router refreshes its arp table as soon as the mashine is brought up on the dr side.
But the main site is not refreshed for 30 seconds to a minute later.
Not a big deal but I am curious.
Is the netbios traffic enough to refresh the arp table on the dr side?
what traffic would be required to update the arp table, broadcast traffic ?
If so, whay does the main site side take so long, if it is a bridged connection, it should get the same brocasts.
maybe not instantly, but sooner than 30-60 seconds correct?