Date: Mon, 21 Apr 1997 05:39:41 -0500 From: Tim Tsai <tim@futuresouth.com> To: questions@freebsd.org, isp@freebsd.org Subject: Help interpreting this tcpdump log Message-ID: <19970421053941.63305@shell.futuresouth.com>
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I am enclosing a tcpdump session that demonstrate a problem we're seeing. ts is a Livingston terminal server and mail is a FreeBSD 2.2.1R machine. The problem is that "telnet mail 25" from the terminal server will show the initial sendmail login banner, but nothing works after that. It seems that this problem is only showing up if we go through the terminal server. Any ideas? MTU is set to 1500 on both machines and they're on the same ethernet segment. Thanks, Tim Result of: "ts> telnet mail 25<cr>" "HELP<cr>" no response after this. 05:22:41.144757 ts.1062 > mail.smtp: S 127:127(0) win 2048 05:22:41.144909 mail.smtp > ts.1062: S 1673748096:1673748096(0) ack 128 win 16384 <mss 1460> (DF) 05:22:41.145669 ts.1062 > mail.smtp: . ack 1 win 2048 05:22:41.157537 mail.smtp > ts.1062: P 1:94(93) ack 1 win 16384 (DF) 05:22:41.158462 ts.1062 > mail.smtp: . ack 94 win 2048 05:22:41.199733 ts.1062 > mail.smtp: P 1:7(6) ack 94 win 2048 05:22:41.307065 mail.smtp > ts.1062: . ack 7 win 16384 (DF) 05:22:42.078261 ts.1062 > mail.smtp: P 7:8(1) ack 94 win 2048 05:22:42.107059 mail.smtp > ts.1062: . ack 8 win 16384 (DF) 05:22:42.188094 ts.1062 > mail.smtp: P 8:9(1) ack 94 win 2048 05:22:42.297938 ts.1062 > mail.smtp: P 9:10(1) ack 94 win 2048 05:22:42.307060 mail.smtp > ts.1062: . ack 10 win 16384 (DF) 05:22:42.407825 ts.1062 > mail.smtp: P 10:11(1) ack 94 win 2048 05:22:42.507069 mail.smtp > ts.1062: . ack 11 win 16384 (DF) 05:22:42.737394 ts.1062 > mail.smtp: P 11:12(1) ack 94 win 2048 05:22:42.907061 mail.smtp > ts.1062: . ack 12 win 16384 (DF) 05:22:44.440164 ts.1062 > mail.smtp: F 12:12(0) ack 94 win 2048 05:22:44.440286 mail.smtp > ts.1062: . ack 13 win 16384 (DF) 05:22:44.440880 mail.smtp > ts.1062: P 94:120(26) ack 13 win 16384 (DF) 05:22:44.441368 mail.smtp > ts.1062: F 120:120(0) ack 13 win 16384 (DF) 05:22:44.441763 ts.1062 > mail.smtp: . ack 120 win 2048 05:22:44.442204 ts.1062 > mail.smtp: . ack 121 win 2048
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