Serial number zero and sequence space arithmetic

Cricket Liu cricket at
Tue Jul 11 18:28:04 UTC 2000

> I did not think serial number zero ever went away, and do not understand
> how things are working if it has.  I thought the mechanism the slave
> servers used when they had no backup file for a zone when they did not
> currently have one was to invoke named-xfer saying the current serial
> number is zero and this was supposed to do an unconditional zone transfer.
> I have not looked at the source recently however.

That's not the situation I'm describing.  From BIND 4.8.1 on--
possibly until a late BIND 8 release--a slave that detects that
its master has a serial number of zone for a zone will *always*
transfer that zone, regardless of what serial number the slave
holds for that zone.


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