From owner-freebsd-current Mon Oct 7 11:23:25 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id LAA15755 for current-outgoing; Mon, 7 Oct 1996 11:23:25 -0700 (PDT) Received: from post.io.org (post.io.org [198.133.36.6]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id LAA15743 for ; Mon, 7 Oct 1996 11:23:20 -0700 (PDT) Received: from zap.io.org (taob@zap.io.org [198.133.36.81]) by post.io.org (8.7.5/8.7.3) with SMTP id OAA29978 for ; Mon, 7 Oct 1996 14:23:18 -0400 (EDT) Date: Mon, 7 Oct 1996 14:23:18 -0400 (EDT) From: Brian Tao To: FREEBSD-CURRENT-L Subject: "Invalid hostname" as a hostname? Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk I noticed today that the output from `w', `who' and `last' show the string "invalid hostname" where the hostname/IP address would normally appear. As far as I can tell, the affected people are coming in from a host whose IP address is known in our DNS (this machine is behind a firewall, thus the RFC1918 addresses). What's invalid about "jazz.montreal.ican.net" as a hostname vs. "freedom.montreal.ican.net"? % w 1:45PM up 5 days, 1:11, 53 users, load averages: 3.55, 4.24, 3.68 USER TTY FROM LOGIN@ IDLE WHAT phil p0 10.1.1.80 1:05PM 25 ssh shine q p1 slurp 1:10PM 12 slogin trepan (ssh) q p2 slurp 1:18PM 3 slogin zap (ssh) g2 p3 fall:0.0 1:42PM - ssh crunch batsy p5 groovy.io.org Thu06PM 9 ssh zot jcolvin p7 mosey:0.0 8:29AM 1:11 ssh mail.ican.net rpbird pa roger.io.org 10:48AM 1 ssh -l roger ican.net batsy pb groovy.io.org Wed01PM 1:15 -tcsh (tcsh) khaber pc trip:0.0 7:39AM 7 ssh trepan jean pd stumble:0.0 9:16AM 44 ssh trepan q pe stagger:0.0 10:13AM 2:21 -csh (tcsh) taob pf cabal.io.org Sat07PM - w g2 pg fall:0.0 9:23AM 26 ssh io.org batsy pi groovy.io.org Wed01PM 9 ssh zot khaber pj trip:0.0 7:40AM 25 ssh shine g2 pn fall:0.0 9:23AM 3:48 ssh crunch jazzman po invalid hostname 9:40AM 1:01 /usr/local/bin/ssh mail g2 pp fall:0.0 11:18AM 2:01 ssh -l jake shine g2 pq fall:0.0 9:23AM 2:41 ssh trepan.io.org boobie pr boobie 11:21AM 2:13 /usr/local/bin/ssh -l bobbi ican.net q ps slurp 11:25AM - slogin wave (ssh) g2 pt fall:0.0 12:16PM 11 ssh trepan boobie pv boobie 11:32AM 48 /usr/local/bin/ssh -l cathy trepan maddox q1 duppy.montreal.i 8:37AM 10 /usr/local/bin/./ssh crunch maddox q2 duppy.montreal.i 8:39AM 10 /usr/local/bin/./ssh -l stephane shine boobie q3 boobie 11:34AM 1:57 /usr/local/bin/ssh -l cathy empress maddox q4 duppy.montreal.i 8:46AM - /usr/local/bin/./ssh mail.ican.net jcolvin q5 nap.io.org 9:08AM 4:36 irc jc nap.io.org (irc-2.8.16beta) g2 q6 fall:0.0 11:34AM 13 ssh zap boobie q7 boobie 11:34AM 2:09 /usr/local/bin/ssh -l boobie trepan jcolvin q8 mosey:0.0 8:09AM 35 ssh shine jcolvin qa mosey:0.0 8:09AM 35 ssh crunch jcolvin qb mosey:0.0 8:09AM 1:03 ssh trepan jcolvin qc mosey:0.0 8:09AM 1:04 ssh trepan syick qd syick Fri04PM 5 /usr/local/bin/ssh -l syick trepan jcolvin qe mosey:0.0 9:08AM 4:36 ssh nap.io.org boobie qf boobie 11:50AM 1:54 /usr/local/bin/ssh -l cathy shine jazzman qg invalid hostname 11:36AM 42 /usr/local/bin/ssh shine phil qh 10.1.1.80 12:40PM 22 ssh mail.ican.net batsy qi groovy.io.org 12:24PM 53 ssh zap phil qj 10.1.1.80 12:48PM 21 ssh ican.net khaber Pl trip:0:S.0 7:40AM 49 ssh trepan khaber Pm trip:0:S.1 7:41AM 10 ssh crunch bigmac Qo freedom.montreal 8:30AM 30 ssh shine bigmac Qp freedom.montreal 8:36AM 1:15 ssh mail.ican.net bigmac Qq freedom.montreal 8:37AM 5:08 -usr/local/bin/tcsh bigmac Qr freedom.montreal 8:37AM 2:03 ssh trepan bigmac Qs freedom.montreal 8:37AM 30 ssh crunch twiggy Qt invalid hostname 11:08AM 1:01 /usr/local/bin/ssh shine twiggy Qu invalid hostname 11:22AM 45 /usr/local/bin/ssh crunch twiggy Qv invalid hostname 11:22AM - /usr/local/bin/ssh mail twiggy R0 invalid hostname 11:26AM 8 /usr/local/bin/ssh trepan twiggy R1 invalid hostname 11:26AM 8 /usr/local/bin/ssh trepan % last jazzman jazzman ttyqg invalid hostname Mon Oct 7 11:36 still logged in jazzman ttypo invalid hostname Mon Oct 7 09:40 still logged in jazzman ttypr invalid hostname Fri Oct 4 22:26 - 23:57 (01:30) jazzman ttypa 10.2.120.26 Fri Oct 4 21:07 - 21:09 (00:01) jazzman ttypv 10.2.120.26 Fri Oct 4 16:42 - 21:23 (04:41) jazzman ttyq2 invalid hostname Fri Oct 4 16:26 - 21:23 (04:57) jazzman ttyq1 invalid hostname Thu Oct 3 09:05 - 15:57 (06:51) jazzman ttypp invalid hostname Thu Oct 3 08:16 - 15:56 (07:40) jazzman ttyq4 10.2.120.26 Wed Oct 2 18:31 - 23:58 (05:27) jazzman ttyp3 10.2.120.26 Wed Oct 2 16:59 - 23:58 (06:59) jazzman ttyp3 10.2.120.26 Wed Oct 2 16:10 - 16:56 (00:46) jazzman ttyph 10.2.120.26 Wed Oct 2 16:06 - 16:56 (00:49) wtmp begins Tue Oct 1 17:01 % fgrep jazzman /var/log/messages Oct 2 16:06:48 nap login: login from 10.2.120.26 as jazzman Oct 2 16:10:02 nap login: login from 10.2.120.26 as jazzman Oct 2 16:59:03 nap login: login from 10.2.120.26 as jazzman Oct 2 18:31:24 nap login: login from 10.2.120.26 as jazzman Oct 3 08:16:05 nap login: login from jazz.montreal.ican.net as jazzman Oct 3 09:05:20 nap login: login from jazz.montreal.ican.net as jazzman Oct 4 16:26:36 nap login: login from jazz.montreal.ican.net as jazzman Oct 4 22:26:41 nap login: login from jazz.montreal.ican.net as jazzman Oct 7 09:40:01 nap login: login from jazz.montreal.ican.net as jazzman Oct 7 11:36:44 nap login: login from jazz.montreal.ican.net as jazzman -- Brian Tao (BT300, taob@io.org, taob@ican.net) Senior Systems and Network Administrator, Internet Canada Corp. "Though this be madness, yet there is method in't"