On Jun 20, 2013, at 10:08, abang wrote:
> Am 20.06.2013 15:29, schrieb Vernon Schryver:
Quoting an earlier message:
>>>> "..It seems your nameservers don't agree on the SOA serial number!..."
>>
>> I wouldn't put too much stock in what http://viewdns.info/ says
>> about anything...
>
> Yes of course. But in this case it is true.
>
> $ dig +short @ns1.linkedin.com linkedin.com. soa
> ns1.linkedin.com. hostmaster.linkedin.com. 2013061316 3600 600 604800 60
> $ dig +short @ns1.p43.dynect.net. linkedin.com. soa
> ns1.p43.dynect.net. hostmaster.linkedin.com. 2013061801 3600 600 604800 60
Think about the role of the SOA serial number. It is used to manage the way
AXFR (and Notify/IXFR) work. We also know that AXFR is not the only way to
move a zone between authoritative servers, for example, rsync of files. So,
the significance of the serial number is limited to situations that are relying
on AXFR, and in other cases, the serial number may be interesting, but not
important to proper protocol operation.
E.g., a cache does not know the serial number corresponding to most of the
answers in the cache. ("Most" - thinking about the cached SOA's and other
cases like that [NCACHE].)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Edward Lewis
NeuStar You can leave a voice message at +1-571-434-5468
There are no answers - just tradeoffs, decisions, and responses.
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