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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