Problem with PTR records and resolver buffer

Skip Montanaro skip at mojam.com
Fri Sep 17 16:17:19 UTC 1999


    Pasztor>  There is an IP address which has 55 PTR records, and mail
    Pasztor>  cannot get through from this machine to our site, since
    Pasztor>  reverse lookup fails for this IP address, and our mail server
    Pasztor>  does not accept mail from undetermined IP addresses.  I
    Pasztor>  certainly do not want to drop reverse lookup from the mailer,
    Pasztor>  but allow the mail to be delivered.

    Pasztor>  The address in question  is 194.143.245.2.

    Pasztor>  It seems that a buffer is too small in the resolver routine.
    Pasztor>  Operating system is Solaris 2.6. Note that on another machine
    Pasztor>  with Solaris 2.7 reverse lookup works fine.

For what it's worth, this also fails on RH Linux 5.2:

    % host 194.143.245.2
    2.245.143.194.IN-ADDR.ARPA domain name pointer smtp.mgx.hu
    2.245.143.194.IN-ADDR.ARPA domain name pointer news.mgx.hu
    2.245.143.194.IN-ADDR.ARPA domain name pointer r-soft.mgx.hu
    ...
    2.245.143.194.IN-ADDR.ARPA domain name pointer bp.hi.mgx.hu
    2.245.143.194.IN-ADDR.ARPA domain name pointer 2.245.143.194.IN-ADDR.ARPApacket size error ((nil) != 0xbffff176)

Skip Montanaro | http://www.mojam.com/
skip at mojam.com | http://www.musi-cal.com/~skip/
847-971-7098   | Python: Programming the way Guido indented...


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