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Old 08-15-2010, 11:31 AM   #1
Registered: Jul 2010
Distribution: Slackware
Posts: 36

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DNS issues, all illegitimate DNS queries resolve to me!??!

I got an urgent problem...

When I do nslookups or traceroutes on my server... Everything that doesnt have legitimate DNS resolves to me... I had a wildcard A record which I deleted and replaced with the subdomains I actually have, could that have been it?

If I were to traceroute it would find its way to google servers and an nslookup would bring me the IP.. however, if I were to traceroute something ridiculous like it traceroutes back to me as a subdomains to my own domain, that is

and the nslookup gives my ip.. the problem is that my mail server when doing the IP lookups believe that the mail is for my server and allows it.. after that I don't know where it goes because the user doesnt exist on my server and it doesn't see that at that time...

What's going on??? Thanks!
Old 08-16-2010, 02:16 PM   #2
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When you removed the A record did you remember to increment your serial number in the zone file?
Old 08-17-2010, 06:29 AM   #3
Registered: Jul 2010
Distribution: Slackware
Posts: 36

Original Poster
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I had no idea what this was but thanks to you I have learnt a little more...

And to answer your question, no I didn't change the serial. One of the few things I don't host myself is DNS and the company that has the DNS servers do the serial numbers themselves. I can change other stuff in the SOA record but not serial. They do keep serials though since nslookup -type=soa returns a long serial number and since my DNS works after updating, I conclude that the numbers in the serial must be in increasing order, although the company doesn't follow the recommended standard (YYYYMMDDnn).

I send a mail and asked them out of curiosity... doubt I'll get an answer though.. It's not really the everyday question for
them I guess...

Im still VERY CURIOUS though as to why unresolvable addresses, when trying to resolve them from my server's ip, always resolved to myself when using wildcard DNS (* I'd REALLY like someone to explain that to me... (and it wasn't just the server itself, all the computers behind the router, both Linux and Windows resolved things in this way)...
Old 08-17-2010, 06:38 AM   #4
Registered: Jul 2010
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(Got an answer from DNS guys, they increase it by 1 every time automatically when updating DNS)


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