Sequence number arithmetic
Cricket Liu
cricket at nxdomain.com
Thu Feb 6 23:20:53 UTC 2003
On Thursday, February 6, 2003, at 12:45 PM, Fernando Gont wrote:
> Section 3.3.13 of RFC 1035 says:
>
> SERIAL The unsigned 32 bit version number of the original copy
> of the zone. Zone transfers preserve this value. This value
> wraps and shuould be compared using sequence space
> arithmetic.
>
> Does BIND not only check whether the primary's SOA serial number is
> higher than that of the local copy of the SOA record, but does some
> further comparision?
>
> I mean, I don't understand quite well what "sequence space arithmetic"
> a nameserver is expected to use. If the SERIAL field is expected to
> wrap, then I think the secondary would have to check whether the
> serial number of its SOA record is *equal* to that of the primary, and
> make a zone transfer whenever they are *different*.
You might read RFC 1982, "Serial Number Arithmetic."
cricket
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