Since upgrading to 10.6.5 I have had DNS problems.
Whilst nslookup and ping will resolve the DNS names to their correct IP addresses, safari and other services won't.
The problem seems to be related purely to CNAME entries which are in a different forward lookup zone to the A record.
For instance if we had a forward lookup zone of foo.bar and an A record of www going to 10.1.1.15 (http://www.foo.bar = 10.1.1.15) and then a CNAME record of go in a zone bloo.by (go.bloo.by = http://www.foo.bar) then ping and nslookup will resolve go.bloo.by to 10.1.1.15 but it seems safari can't.
Anyone else??
Read more about this problem and similar DNS issues here http://discussions.apple.com/thread.jspa?threadID=2648002&tstart=0
Whilst nslookup and ping will resolve the DNS names to their correct IP addresses, safari and other services won't.
The problem seems to be related purely to CNAME entries which are in a different forward lookup zone to the A record.
For instance if we had a forward lookup zone of foo.bar and an A record of www going to 10.1.1.15 (http://www.foo.bar = 10.1.1.15) and then a CNAME record of go in a zone bloo.by (go.bloo.by = http://www.foo.bar) then ping and nslookup will resolve go.bloo.by to 10.1.1.15 but it seems safari can't.
Anyone else??
Read more about this problem and similar DNS issues here http://discussions.apple.com/thread.jspa?threadID=2648002&tstart=0