Serial Numbers

[Brad]

Hi
I just want to verify something...

I am of the understanding that serial numbers are only important between
authoritive servers and have no real meaning for other dns servers?

lets say we ahve auth1 and auth2 and remotecache1
auth1 and 2 are authoritive for a given domain, where remotecache1 is just a
dns server out in the wilderness somewhere....

Does remotecache1 look up and compare serial numbers from auth1 or auth2
when the TTL expires and it needs to refresh its information? Does
remotecache1 care at all about the serial number? I would think that it
doesnt care what serial number is in the zone.

Lets say that the given domain was re-delegated to newauth1 and newauth2.
They specify a serial number that is lower than the old auth DNS servers had
in their zone. When the TTL expires, remotecache1 should not care that the
new auth DNS servers have a ower serial, and should still update from the
newauth1 and 2by going  through the root servers and find the new auth
nameserverss and query them for the correct information???

Any input appreciated..

Brad




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