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Date:      Fri, 7 Mar 1997 18:44:01 +0100 (CET)
From:      Stefan Esser <se@zpr.uni-koeln.de>
To:        hackers@freebsd.org
Subject:   TCP/IP problem to one particular FreeBSD machine ...
Message-ID:  <199703071744.SAA02637@x14.mi.uni-koeln.de>

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I've been wondering about this for quite some time:

The main German *.de.freebsd.org server machine is well 
connected to my network, but I can't access it from my 
FreeBSD-current system ...

In the past, I often FTPed files to some other machine,
and then to my system in a second step, for that reason.

Now I tried to use CVSUP (after the splatter disk failure,
I'm normally receiving CTM updates ...) and found, that I
can't get a connection, again :(

With FTP, I see that the remote end is reached, but the 
connection seems to freeze before the login is complete.
CVSUP seems to fail with a time-out after about one minute.

I append the tcpdump log of an attempted CVSUP run. My end
is "x14" (a PPP line to an ANNEX terminal server), and the
CVSUP.DE.FreeBSD.Org system (Blues.Physik.RWTH-Aachen.De)
is listet as "cvsup". Any ideas what is going on ?

17:07:13.072353 x14.1124 > cvsup.5999: S 3549284397:3549284397(0) win 16384 <mss 1460,nop,nop,sackOK,nop,wscale 0,nop,nop,timestamp 37093 0,eol,[|tcp]> (DF) (ttl 64, id 53603)
17:07:13.250384 cvsup.5999 > x14.1124: S 2202693665:2202693665(0) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329189 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63211)
17:07:13.250732 x14.1124 > cvsup.5999: . ack 1 win 17280 <nop,nop,timestamp 37094 329189,nop,nop,cc 178> (DF) (ttl 64, id 53604)
17:07:15.890336 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329194 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63212)
17:07:15.893312 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37099 329194,nop,nop,cc 178> (DF) (ttl 64, id 53605)
17:07:18.591055 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37104 329194,nop,nop,cc 178> (DF) (ttl 64, id 53606)
17:07:21.790402 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329206 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63216)
17:07:21.791032 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37111 329206,nop,nop,cc 178> (DF) (ttl 64, id 53607)
17:07:27.591033 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37122 329206,nop,nop,cc 178> (DF) (ttl 64, id 53608)
17:07:33.790428 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329230 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63299)
17:07:33.791120 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37135 329230,nop,nop,cc 178> (DF) (ttl 64, id 53609)
17:07:45.591174 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37158 329230,nop,nop,cc 178> (DF) (ttl 64, id 53702)
17:07:57.890373 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329278 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63312)
17:07:57.890973 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37183 329278,nop,nop,cc 178> (DF) (ttl 64, id 53989)
17:08:21.591060 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37230 329278,nop,nop,cc 178> (DF) (ttl 64, id 54188)
17:08:45.860412 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329374 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63335)
17:08:45.861037 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37279 329374,nop,nop,cc 178> (DF) (ttl 64, id 54219)
17:09:33.591102 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37374 329374,nop,nop,cc 178> (DF) (ttl 64, id 54220)
17:09:49.760367 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329502 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63359)
17:09:49.761042 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37407 329502,nop,nop,cc 178> (DF) (ttl 64, id 54221)
17:10:53.591097 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37534 329502,nop,nop,cc 178> (DF) (ttl 64, id 54789)
17:10:53.770331 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329630 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63382)
17:10:53.770958 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37535 329630,nop,nop,cc 178> (DF) (ttl 64, id 54790)
17:11:57.591067 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37662 329630,nop,nop,cc 178> (DF) (ttl 64, id 54822)
17:11:57.750329 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329758 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63403)
17:11:57.750947 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37663 329758,nop,nop,cc 178> (DF) (ttl 64, id 54823)
17:13:01.591115 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37790 329758,nop,nop,cc 178> (DF) (ttl 64, id 55380)
17:13:01.710492 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 329886 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63513)
17:13:01.711154 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37791 329886,nop,nop,cc 178> (DF) (ttl 64, id 55381)
17:14:00.555980 x14 > cvsup: icmp: echo request (ttl 255, id 55544)
17:14:00.740354 cvsup > x14: icmp: echo reply (ttl 248, id 63531)
17:14:01.560250 x14 > cvsup: icmp: echo request (ttl 255, id 55545)
17:14:01.850393 cvsup > x14: icmp: echo reply (ttl 248, id 63535)
17:14:02.570242 x14 > cvsup: icmp: echo request (ttl 255, id 55546)
17:14:02.750275 cvsup > x14: icmp: echo reply (ttl 248, id 63536)
17:14:03.580572 x14 > cvsup: icmp: echo request (ttl 255, id 55547)
17:14:03.740325 cvsup > x14: icmp: echo reply (ttl 248, id 63537)
17:14:04.590427 x14 > cvsup: icmp: echo request (ttl 255, id 55548)
17:14:04.740325 cvsup > x14: icmp: echo reply (ttl 248, id 63538)
17:14:05.591030 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37918 329886,nop,nop,cc 178> (DF) (ttl 64, id 55554)
17:14:05.770340 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 330014 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63539)
17:14:05.770901 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 37919 330014,nop,nop,cc 178> (DF) (ttl 64, id 55561)
17:15:09.591098 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 38046 330014,nop,nop,cc 178> (DF) (ttl 64, id 56081)
17:15:09.820394 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 330142 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63562)
17:15:09.821046 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 38047 330142,nop,nop,cc 178> (DF) (ttl 64, id 56082)
17:16:13.591098 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 38174 330142,nop,nop,cc 178> (DF) (ttl 64, id 56111)
17:16:13.680350 cvsup.5999 > x14.1124: SP 2202693665:2202693692(27) ack 3549284398 win 17280 <mss 1460,nop,wscale 0,nop,nop,timestamp 330270 37093,nop,nop,cc[|tcp]> (DF) (ttl 57, id 63586)
17:16:13.680979 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 38175 330270,nop,nop,cc 178> (DF) (ttl 64, id 56112)
17:17:17.591087 x14.1124 > cvsup.5999: P 1:12(11) ack 28 win 17280 <nop,nop,timestamp 38302 330270,nop,nop,cc 178> (DF) (ttl 64, id 56618)
17:17:17.650301 cvsup.5999 > x14.1124: R 28:28(0) ack 1 win 17280 (DF) (ttl 57, id 63610)

Thanks in advance, Stefan



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