Constant dns lookups for non-existent addresses

Hi. I'm connected to a large network and I've noticed
that there are constant dns lookups for addresses that
do not exist.
When i run tcpdump, almost every second
I see a few requests to the dns server from my IP. And all
of them get the response NXDOMAIN.
Is there a reason this should happen or is there something
not working properly on my computer?
Thanks
Last edited by m00nblade (2010-01-25 21:42:23)

It all depends on your setup.
If you use only local mail domains, just make sure you do not have a catchall address (luser_relay) and messages to unknown users will not be accepted by Postfix in the first place.
If you use virtual mail domain, you will need to change your setup as Apple's default setup will always accept mail for unknown users and then bounce it back to sender. See here for a how to: Making Virtual Mail Users in OS X 10.4/10.5 Server
HTH,
Alex

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    >
    > Hello,
    >
    > I am running GW8.0.2 on Netware 6.5sp8. I have a server that our
    > recreation department uses to send out confirmation emails when a
    > customer signs up for a class. The recreation server and the GWIA are on
    > the same subnet.
    >
    > Here's the problem: When the Rec server sends out the first email
    > confirmation, it gets sent out successfully. Subsequent emails after
    > that fail. After about twenty minutes the next email will go out OK
    > again but subsequent emails will fail.
    >
    > The verbose logs on the GWIA don't tell me much but the diagnostic logs
    > show what looks like a reverse DNS lookup happening at the GWIA for my
    > local IP address of 10.0.0.3 (the Rec server). This reverse DNS lookup
    > fails (probably a timeout) and subsequent emails from this local Rec
    > server get dropped by the GWIA without the DNS lookup.
    >
    > DNS is being done by DNS proxy on Bordermanager 9.2. I've bypassed the
    > Bordermanager DNS and the same thing happens. I've made entries for the
    > local Rec server into a route.cfg file but the GWIA seems to want to
    > ignore these entries and keeps doing the DNS lookup.
    >
    > The wierdest part of the puzzle is that if I restart the proxy on the
    > Bordermanager the next email will go out with, of course, subsequent
    > emails failing. I've looked at the proxy dns cache and can't even find
    > an entry for my Rec server.
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    hata2                                              26                     13                     1                     
    hata2                                              26                     14                     0                     
    hata2                                              26                     15                     0                     
    hata3                                              26                     13                     0                     
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    hata3                                              26                     15                     0                     
    hata4                                              26                     13                     0                     
    hata4                                              26                     14                     0                     
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    Message was edited by:
    JS1

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