Hi Tracy,
You are right. I trid the nbtstat -A 218.246.127.68,
it really return NETBIOS name.
Yes,in windows platform,"gethostbyaddr" is adapted to
NETBIOS. And microsoft advise to use "getnameinfo"
instead of "gethostbyaddr". please see:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/win
sock/gethostbyaddr_2.asp
But I can't find "getnameinfo" in <winsock2.h> at all
with vc6.0.I don't know why.
Best regards,
Jhon
----- Original Message -----
From: "Tracy" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, September 26, 2003 9:07 PM
Subject: [xmail] Re: question about RDNS
> You're running Windows, yes? If so, this is "by design". If Windows is not
> able to resolve an address by finding a PTR record, it attempts to resolve
> the address using NetBIOS - to do this, it issues a NetBIOS request to the
> machine in question and listens for a response. Assuming no firewalls get
> in the way, the machine will answer that request with it's "computer name"
> (the locally assigned name that was created during the installation of
> Windows).
>
> Try using:
>
> nbtstat -A 211.149.111.76
>
> and see what comes back (note that the -A must be a capital A, not a lower
> case a). I'm guessing that the name you are seeing in your mail logs will
> show up in the output from that command. (I'd try it here, to give you
> sample output, but I have NetBIOS blocked at my border router.)
>
> At 09:13 9/26/2003, jhon wong wrote:
>
>
> >Hi,Jeff:
> >
> > According to my knowledge, when gethostbyname
> >execute RDNS result,it should return FQDN result
> >if ip has PTR.
> > But I find that sometimes non FQDN result
> >is returned and in fact the ip hasn't PTR at all.
> >That is the problem.
> >
> >
> >
> > > >
> > > Hi Davide,
> > >
> > > Could his problem have anything to do with Verisign's new policy of
> > > redirecting lookups for bogus domains to one of their sites?
> > >
> > > Jeff
> > >
> > >
> > > -
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