local lookups ok, remote lookups broken.

i18rabbit i18rabbit at cwazy.co.uk
Sat Dec 20 09:57:59 UTC 2003


i am confused as to who is at fault
for reverse DNS lookup failures.
i would sincerely value any help.

network:

A                  B                 C            D
MyLocalGateway <-> MyISPsNetwork <-> Internet <-> RemoteServer

all lookups for A when using A's DNS work fine.
all lookups for A when using B's DNS work fine.
reverse lookups for A when at D fail when not
 specifying any particular DNS server to use
 in a host(1) command (this problem causes my email
 from A to be rejected by mail servers that do
 reverse DNS lookups - BAD problem).
reverse lookups for A when at D work fine only when
 specifying B's DNS servers in a host(1) command.

there is no problem locating A in any browser/ftp/etc,
from any location, whether numeric or "human-readable"
forms are used when specifying A's location.

who's fault is it that reverse dns lookups for A
do not work from remote servers on the Internet?

Thank you.


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