DNS Issues...need help

[Sally Devine]

Hi All,
My problem is that suddenly we could not longer resolve any names from the DNS. We could not even query the DNS using nslookup. This pointed to a DNS problem, however another server on the same network could. Only difference is one server is v.5.1b (not working) and the other working server is v.5.1. Another curious thing is that when we use nslookup -v the name is resolved. So basically I am trying to find out the difference between nslookup and nslookup -v. There is no -v in the man pages and I just tried it thinking it would mean "verbose" however it seems to force a query with positive results. We removed the dns option from the nsswitch.conf and that fixed our telnet problem. We cannot just keep adding everything to the host files and we need to get a proper resolution, so if anyone has any ideas...please share.

Thanks,
SD

[Ralf Puchner]

have you checked the /etc/svc.conf file pointing to the correct resolution method? (configuration with svcsetup utility).

If you have seen the resolution order check the single subsystems for proper work.

[Sally Devine]

Yes I did check the svc.conf and it is the same as it was before. Nothing changed.
Thanks,

[Sally Devine]

Ok. I found out that the (-v) means to force it to use TCP rather than the default of UDP. So we seem to be having a problem with UDP. So naturally I assume the router, however other systems on that network are fine and work. The only difference with this machine is that it is Tru64 v. 5.1b and the others are just v 5.1.

[Sally Devine]

Another thing we have just discovered is that the system is hitting port 0 on the DNS when it does a query. Apparently, this could be a bug.

[Mobeen_1]

Sally,
Sounds like a bug and you may have to review the patches available that address this issue

rgds
Mobeen

[Sally Devine]

Well we shut down the oracle database and everything was fine. When we brought the database back up, it was still fine. So there was a problem with the database somehow and memory I assume.

Thanks everyone for the responses.