Two questions about the name server address sorting functionality

[Johan Larsson (EAB)]

Hi!

I'm running a BIND 9.1.3 nameserver and I have some questions about the address sorting functionality of the name server, which sometimes seems a bit strange to me.

1. When I have a sort list configured and I get a response containing multiple IP adresses, any address matching an entry in the sort list should be preferred 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 same order, hence disabling the round-robin feature. Is this the correct behaviour?

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 belongs 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 this behaviour?

Best Regards,
Johan Larsson