[ILUG] Mystery POP mail problem (connections refused to 192.168.*.* numbers)

From: Joe Desbonnet (joe at domain local.ie)
Date: Wed 21 Apr 1999 - 16:03:57 IST

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Does anyone know whats happening here? This is on a Linux (RH5.0) machine
which has happily collected email (via dialup) and acted as a local POP
server for the last 2 years. All of a sudden (yesterday) the machine starts
refusing access to the local computers on the LAN (using 192.168.6.* IP
numbers). The strange thing is that *occasionally* it does allow access.

Its using a tinet nameserver. And what is this
read-rfc1918-for-details.iana.net host name (I know RFC 1918 refers
to the 192.168.* allocations) but the where that host name comes
from I have no idea.

maillog recors appended below...

Any ideas?

Thanks,

Joe.
joe at domain local.ie
joe at domain wombat.ie

BEFORE:

Apr 18 00:02:58 gate ipop3d[25405]: connect from 192.168.6.17
Apr 18 01:03:01 gate ipop3d[25405]: Login user=mccauley host=192.168.6.17
Apr 18 01:03:02 gate ipop3d[25405]: Logout user mccauley host 192.168.6.17
Apr 18 00:03:59 gate ipop3d[25406]: connect from 192.168.6.17
Apr 18 01:04:04 gate ipop3d[25406]: Login user=mccauley host=192.168.6.17
Apr 18 01:04:06 gate ipop3d[25406]: Logout user mccauley host 192.168.6.17
Apr 18 00:04:59 gate ipop3d[25407]: connect from 192.168.6.17
Apr 18 01:05:04 gate ipop3d[25407]: Login user=mccauley host=192.168.6.17
Apr 18 00:05:05 gate ipop3d[25408]: connect from 192.168.6.107
Apr 18 01:05:06 gate ipop3d[25408]: Login user=donagher host=192.168.6.107
Apr 18 01:05:07 gate ipop3d[25407]: Logout user mccauley host 192.168.6.17
Apr 18 01:05:07 gate ipop3d[25408]: Logout user donagher host 192.168.6.107
Apr 18 00:05:57 gate ipop3d[25409]: connect from 192.168.6.17
Apr 18 01:05:59 gate ipop3d[25409]: Login user=mccauley host=192.168.6.17
Apr 18 01:06:01 gate ipop3d[25409]: Logout user mccauley host 192.168.6.17
Apr 18 00:06:56 gate ipop3d[25416]: connect from 192.168.6.17

AFTER:
Apr 21 11:52:14 gate ipop3d[1430]: warning: can't verify hostname:
gethostbyname(read-rfc1918-for-details.iana.net) failed
Apr 21 11:52:14 gate ipop3d[1430]: refused connect from 192.168.6.10
Apr 21 11:52:21 gate ipop3d[1431]: warning: can't verify hostname:
gethostbyname(read-rfc1918-for-details.iana.net) failed
Apr 21 11:52:21 gate ipop3d[1431]: refused connect from 192.168.6.17
Apr 21 11:53:21 gate ipop3d[1436]: warning: can't verify hostname:
gethostbyname(read-rfc1918-for-details.iana.net) failed
Apr 21 11:53:21 gate ipop3d[1436]: refused connect from 192.168.6.17
Apr 21 11:53:51 gate ipop3d[1439]: warning: can't verify hostname:
gethostbyname(read-rfc1918-for-details.iana.net) failed

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