DNS SRV RRs and priority
ghudson at MIT.EDU
Fri Jun 1 00:45:14 EDT 2012
On 05/31/2012 09:33 PM, Jaap Winius wrote:
> One of the sites I maintain uses DNS SRV resource records to allow
> Debian squeeze workstations to discover three MIT Kerberos key
> servers. Like with all SRV records, it's possible to alter the
> priority value, but my question is, does this ever make a difference?
We do sort SRV responses by priority (but we ignore weights).
> So I tried an experiment: use three SRV records, but give the one for
> the local KDC the highest priority. Unfortunately, this way the system
> behaves just like in the first situation. So, now I'm back to using
> one SRV RR per location.
My only guess is that you have the sense of SRV priorities backwards?
Per RFC 2782, we prefer records with lower-numbered priority fields over
records with higher-number priority fields.
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