Re[2]: mirc32 6.0x crash when resolving dns.

[3APA3A <3APA3A () SECURITY NNOV RU>]

Dear Peter Pentchev,

A  way  to  delegate  reverse  resolution  for  network less than /24 is
defined in RFC 2317. And it's different from one used.

But  you're  right: the problem is probably not in unresolvable PTR. The
problem  is  in unresolvable CNAME instead of PTR, so PTR is never found
at   all.   And   yes:   it  may  affect  different  applications  where
gethostbyname()  is  used. I will test gethostbyname() behavior for this
case in Windows and Unix and report back.

--Thursday, May 29, 2003, 11:26:04 AM, you wrote to 3APA3A () SECURITY NNOV RU:

PP> On Wed, May 28, 2003 at 02:45:25PM +0400, 3APA3A wrote:
> > Dear Davide Del Vecchio,
> >
> > Currently 210.193.16.25 doesn't resolve. But during original test it had
> > flowed PTR record:
> >
> > bash-2.03$ host 210.193.16.25
> > 25.16.193.210.IN-ADDR.ARPA is a nickname for 25.16.16.193.210.IN-ADDR.ARPA
> >
> > (.16 is twice)

PP> This is not necessarily a flawed record; I believe it might be as simple
PP> as the ultimate in classless reverse DNS delegation.  Note that the
PP> 16.193.210.in-addr.arpa zone is delegated to ns[12].qala.com.sg, while
PP> this specific "alias" subdelegates the reverse DNS records for
PP> 210.193.16.25 to dns[12].lga.net.sg.

PP> G'luck,
PP> Peter



-- 
~/ZARAZA
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