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# 15  
Old 07-02-2001
Neo, curious what makes you suspicious of the dns server?

Don
# 16  
Old 07-02-2001
Missing periods at the end of A records in DNS can cause problems similar to the one you describe (in UNIX servers). This is an old 'gotcha' that has caused many admins a few grey hairs.
However, since your DNS server is NT, I really have no clue no the intricate details and gotchas.

If you were running UNIX, you could simply increase the logging level and check syslog for the exact process (or error) during transactions. I can't suggest any way ahead on NT, sorry.
# 17  
Old 07-02-2001
Hi Don,



Have you tried running a Packet sniffer on the NT machine? It may help you to see what the problem is.



Ethereal (www.ethereal.com) is a pretty good program and is freely available for Unix and Windows machines.







Andy Hibbins Smilie
# 18  
Old 07-02-2001
Andy,

Good idea, I used Network Monitor which is part of the SMS package for NT. There isn't any dns queries coming out of the sun box, so I would be inclined to thinks it's something mis-configured in the sun box.

Don

# 19  
Old 07-02-2001
you ruled that out when you were able to ping, telnet, ftp to anything via hostname so long as it is not in your /etc/hosts file.

and the fact that you were getting nslookup responses let alone funtionality says for the most part it is working. i am going to have to rule this one as a remove the proxy1 dns entri and restart the DNS service on NT . then re add it.
# 20  
Old 07-02-2001
Optimus_P,

Why would I suspect the name server if the sun box isn't even producing a DNS query. I would 100% agree if I could see a dns query from the sun box and the nt box wasn't responding or sending mis-information.

Thanks,

Don
# 21  
Old 07-11-2001
Hi folks,

After searching the net for information I have finally found out that SunOS 4.1.4 has an issue with DNS (basically doesn't work without NIS or a patched resolver) The following is the thread that discusses the issue:

> Has anyone successfully gotten their statically linked FWTK-1.3 proxies
> working on a SunOS 4.1.4 platform *NOT* running NIS?

Yes, using BIND library or libresolv+.

> Our recent effort
> at building such a firewall makes me think the SunOS 4.1.4 resolver may
> be seriously broken (i.e., no DNS support), as compared to SunOS 4.1.3.
>
> After a fresh reload of the OS from CDROM, networking apps like ping and
> telnet can only resolve what's in the local /etc/hosts, despite having a
> properly configured /etc/resolv.conf pointing to an internal nameserver.
> Well, properly configured for SunOS 4.1.3, anyway; we don't have the Sun
> Release Notes for SunOS 4.1.4, and there's always a chance this is some
> sort of new Sun feature, I suppose (hint, hint...).
>
> An 'nslookup' from the firewall finds the internal nameserver without any
> problems. The internal nameserver forwards to the DNS on the firewall (a
> split DNS setup), which works; the firewall's DNS forwards to the external
> nameservers, which also works. Changing resolv.conf to point to the local
> nameserver (on the firewall) doesn't fix things.
>
> We snooped the inside net, and saw no DNS packets from the firewall to the
> inside nameserver when the resolver should have been sending to it; when a
> name was checked using nslookup from the firewall, we saw the traffic we'd
> expect. Starting up a ypbind on the firewall (for test purposes only) got
> us full resolvability (the NIS master goes to the internal DNS).

As far as I know, SunOS 4.1.3 had no more DNS support than 4.1.4. Either
your 4.1.3 was running NIS, either its shared libs had been rebuilt with a new
resolver. What you describe is exactly the same as with stock 4.1.3.

> Anyway, to solve our problems, we replaced the SunOS resolver and DNS with
> BIND 4.9.2, rebuilt the shared C library (but not libc.a), and rebuilt the
> proxies with dynamic links (static links still don't work, obviously).

Are you sure that you linked the proxies with your new libresolv.a ? They
should work statically linked as well.

> We now have both Sun and TIS apps on the firewall talking to the internal DNS
> nameserver.

Congratulations.

> Any comments/suggestions/opinions/facts would be welcome. Thanks,

I personally prefer to use libresolv+ rather than BIND library because it
allows to search hosts both in /etc/hosts and DNS. It's sometimes more
comfortable than relying entirely on DNS.

I thank all you for your help in trying to resolve the issue.

Don
 

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