Address of form (#.#.#/#.#.#)

[Russell]

Just looking at my email and I am starting to see
addresses like "smtp.ISP.com (8.12.9p2/8.12.9)". Such
addresses seem to be related to internal LAN address, and
when they are passed to internet they become the usual
TCP/IP address(ip.ip.ip.ip). I am just curious what type
of protocal addressing (8.12.9p2/8.12.9) is being used,
and where can I find more information on it.

 

[David Efflandt]

Just looking at my email and I am starting to see
addresses like "smtp.ISP.com (8.12.9p2/8.12.9)". Such
addresses seem to be related to internal LAN address, and
when they are passed to internet they become the usual
TCP/IP address(ip.ip.ip.ip). I am just curious what type
of protocal addressing (8.12.9p2/8.12.9) is being used,
and where can I find more information on it.

That is not an IP address, 8.12.9 refers to the "sendmail" smtp server
program version. 8.12.9p2 may have some slight modification or was
compiled for a specific system. For example if I telnet to port 25 of my
system it answers (my.domain is disguise for posting):

220 my.domain ESMTP Sendmail 8.12.3/8.12.3/SuSE Linux 0.6; Wed, 26 May
2004 23:42:54 -0500