Two questions about the name server address sorting functionality

[Mark_Andrews at isc.org]

> 
> Hi!
> 
> I'm running a BIND 9.1.3 nameserver and I have some questions about the addre
> ss sorting functionality of the name server, which sometimes seems a bit stra
> nge to me.
> 
> 1. When I have a sort list configured and I get a response containing multipl
> e IP adresses, any address matching an entry in the sort list should be prefe
> rred to the others. But if no IP addresses in the response matches any entry 
> in the sort list, it seems that the IP addresses are still returned in the sa
> me order, hence disabling the round-robin feature. Is this the correct behavi
> our?

	You will need BIND 9.3 to get this fix.

1224.   [bug]           'rrset-order' and 'sortlist' should be additive
                        not exclusive.

> 2. In "DNS and BIND", 4 ed. page 277 it says that BIND 4.x name servers have 
> a "default sortlist". I thought this behaviour was no longer present in BIND 
> 9.1.3., but it seems to me that if one of the IP addresses in a response belo
> ngs to the same subnet as any IP address of my DNS server, this IP address is
>  preferred to the others. If this is the case, is there any way to turn off t
> his behaviour?

	There is no default sortlist.
 
> Best Regards,
> Johan Larsson
>   
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org