[nsd-users] NSD SRV rr return limit

[Bryan Duff]

On 05/15/12 17:18, Will Pressly wrote:
> Hi All,
>
> Is there a limit to the number of SRV records that NSD will return, 
> outside of the upper bound on packet size? I have a name that has ~18 
> SRV records, and I only see the same four, always. The packet size out 
> on the wire is 260B, so I would expect we could cram some more in 
> there, and I am not sure why we are only ever seeing the same five.
>
> I wanted to ask before burning time on a source-code code-dive. I am 
> using nsd 3.2.5.
>
> Thanks,
> Will Pressly
>
>
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Remember NSD doesn't rotate records in the same set (or in any case).  
Also, you aren't going through a caching server are you?

$ dig @192.168.2.231 _autodiscover._tcp.example.org srv
...
;; QUESTION SECTION:
;_autodiscover._tcp.example.org.        IN      SRV

;; ANSWER SECTION:
_autodiscover._tcp.example.org. 30 IN   SRV     1 100 25 mail.example.org.
_autodiscover._tcp.example.org. 30 IN   SRV     2 100 25 mail.example.org.
_autodiscover._tcp.example.org. 30 IN   SRV     3 100 25 mail.example.org.
_autodiscover._tcp.example.org. 30 IN   SRV     4 100 25 mail.example.org.
_autodiscover._tcp.example.org. 30 IN   SRV     5 100 25 mail.example.org.

;; AUTHORITY SECTION:
example.org.            360     IN      NS      ns1.example.org.
//end snip

That was just me quickly creating some entries on a test zone.  Often 
caching servers limit the number of RR's to whatever they feel like (4 
seems common).  That's just my experience.

-Bryan
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