[Freeswitch-users] Authorizations when using DNS SRV bug?

Raymond Chandler intralanman at freeswitch.org
Thu Aug 20 14:55:40 PDT 2009

On Aug 20, 2009, at 5:25 PM, Carlos S. Antunes wrote:

> Raymond Chandler wrote:
>> On Aug 20, 2009, at 5:03 PM, Carlos S. Antunes wrote:
>>> Hmm, where does it say that, after the lookup, one cannot use the  
>>> same
>>> IP address as before? :)
>> Section 4 of RFC3263 as quoted in my first email....
>> "The procedures here MUST be done exactly once per transaction,  
>> where transaction is as defined in [1].
>> "
> Raymond, sure. But do the "procedures here" preclude one from  
> choosing the same host given that both the priorities and weights  
> are the same for all the hosts?

well, not exactly, in fact... every so often, you will end up choosing  
the same 1 out of 4 hosts twice in a row at random, but the procedures  
basically say to choose one at random if they're evenly prioritized  
and evenly weighted.... so saying "i'm gonna keep this one for later  
user" kind of goes against "random"

That said, I'm really just about done with this thread since I don't  
personally agree with the spec in this case anyway since stale nonce  
checking makes sense to avoid replay attacks, etc.  Although, I  
haven't looked at the specs to see if checking for stale nonces breaks  
any specs... that might be an interesting search ;-)

Raymond Chandler
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