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| Title: | DEC TCP/IP Services for OpenVMS |
| Notice: | Note 2-SSB Kits, 3-FT Kits, 4-Patch Info, 7-QAR System |
| Moderator: | ucxaxp.ucx.lkg.dec.com::TIBBERT |
|
| Created: | Thu Nov 17 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5568 |
| Total number of notes: | 21492 |
5310.0. "DECnet/IP connection hangs" by EVTAI1::LEGOUBEY () Thu Mar 06 1997 12:23
A customer uses DECNET/OSI with TCP/IP.
He does a lot of file transfers during the night.
Some transfers work well , some other stay hanging on for ever.
The hanging connections have all the same characteristics:
- Initiator:
AXP V6.2
DECNET/OSI V6.3 ECO5
UCX V3.3 ECO13
- Responder:
VAX V6.2
DECNET/OSI V6.3 ECO6
PATHWAY DE WOLLOGONG 2.5.1
I've done a TCPTRACE from a hanging transfert and I saw a couple a
things that amaze me.
I would like an advice on the data exchange.
I put an extract of the trace at the end of this note.
At the beginning all seem to work well.
1/ FRom seq # = 2207 Wollogong doesn't increments the TCP Acknowledge
Number but the window is big enough and UCX continues to send.
2/ At seq # = 2213 UCX retransmits from the first non acked.
3/ At seq # = 2262 Wollongong acked 14560 bytes and set the window to 0.
4/ At seq # = 2351 UCX send 1 byte of data.
It could it be a probe but I thought that a probe was in fact the
transmission of an already acked byte. But ucx sends a TCP number
equals to the first unacked byte.
5/ At seq # = 2376 Wollogong acked the byte
And so on ...
Thanks for any input,
Francoise
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 2206 at 5-MAR-1997 15:29:50.39
IP Version = 4, IHL = 5, TOS = 00, Total Length = 1496 = ^x05D8
TCP Sequence Number = 1967620102 = ^x75478006
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2207 at 5-MAR-1997 15:29:50.52
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 13104 = ^x3330
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2208 at 5-MAR-1997 15:29:50.68
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 2209 at 5-MAR-1997 15:29:50.68
IP Version = 4, IHL = 5, TOS = 00, Total Length = 1496 = ^x05D8
TCP Sequence Number = 1967621558 = ^x754785B6
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2210 at 5-MAR-1997 15:29:50.81
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2211 at 5-MAR-1997 15:29:50.94
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2212 at 5-MAR-1997 15:29:51.09
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
**** UCX retransmits ******
UCX INTERnet trace XMT packet seq # = 2213 at 5-MAR-1997 15:29:51.09
IP Version = 4, IHL = 5, TOS = 00, Total Length = 1496 = ^x05D8
TCP Sequence Number = 1967608454 = ^x75475286
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2257 at 5-MAR-1997 15:29:53.72
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2258 at 5-MAR-1997 15:29:53.85
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2259 at 5-MAR-1997 15:29:54.00
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2260 at 5-MAR-1997 15:29:54.12
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2261 at 5-MAR-1997 15:29:54.26
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967608454 = ^x75475286
Window = 14560 = ^x38E0
-----------------------------------------------------------------------
***** 14560 bytes are acknowleged and the window is set to 0 ****
UCX INTERnet trace RCV packet seq # = 2262 at 5-MAR-1997 15:29:54.42
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623014 = ^x75478B66
Window = 0 = ^x0000
-----------------------------------------------------------------------
***** Is that a erroneous probe ???? Is the TCP sequence number false??
Shouldn't it be 1967623013 last acked??? *******
UCX INTERnet trace XMT packet seq # = 2351 at 5-MAR-1997 15:29:59.34
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1967623014 = ^x75478B66
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
****** The last xmit packet is acked. Is that possible with a window=0 ****
UCX INTERnet trace RCV packet seq # = 2376 at 5-MAR-1997 15:30:00.49
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623015 = ^x75478B67
Window = 0 = ^x0000
-----------------------------------------------------------------------
**** New probe 10s after the last one ???? *******
UCX INTERnet trace XMT packet seq # = 2546 at 5-MAR-1997 15:30:09.35
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1967623015 = ^x75478B67
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2571 at 5-MAR-1997 15:30:10.63
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623016 = ^x75478B68
Window = 0 = ^x0000
-----------------------------------------------------------------------
**** New probe 20s after the last one ???? *******
UCX INTERnet trace XMT packet seq # = 2918 at 5-MAR-1997 15:30:29.39
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1967623016 = ^x75478B68
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 2941 at 5-MAR-1997 15:30:30.76
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623017 = ^x75478B69
Window = 0 = ^x0000
-----------------------------------------------------------------------
***** Probe received from Wollogong *****
UCX INTERnet trace RCV packet seq # = 3373 at 5-MAR-1997 15:30:53.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1229952286 = ^x494F951E
TCP Acknowledge Number = 1967623016 = ^x75478B68
Window = 1453 = ^x05AD
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 3374 at 5-MAR-1997 15:30:53.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1967623017 = ^x75478B69
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
**** New probe 40s after the last one ???? *******
UCX INTERnet trace XMT packet seq # = 3736 at 5-MAR-1997 15:31:09.47
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1967623017 = ^x75478B69
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 3766 at 5-MAR-1997 15:31:10.83
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623018 = ^x75478B6A
Window = 0 = ^x0000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 4310 at 5-MAR-1997 15:31:33.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1229952286 = ^x494F951E
TCP Acknowledge Number = 1967623017 = ^x75478B69
Window = 1452 = ^x05AC
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 4311 at 5-MAR-1997 15:31:33.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1967623018 = ^x75478B6A
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 4917 at 5-MAR-1997 15:31:57.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1229952286 = ^x494F951E
TCP Acknowledge Number = 1967623017 = ^x75478B69
Window = 1452 = ^x05AC
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 4918 at 5-MAR-1997 15:31:57.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1967623018 = ^x75478B6A
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 5211 at 5-MAR-1997 15:32:09.58
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1967623018 = ^x75478B6A
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 5237 at 5-MAR-1997 15:32:10.96
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623019 = ^x75478B6B
Window = 0 = ^x0000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 5625 at 5-MAR-1997 15:32:33.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1229952286 = ^x494F951E
TCP Acknowledge Number = 1967623018 = ^x75478B6A
Window = 1451 = ^x05AB
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 5626 at 5-MAR-1997 15:32:33.24
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1967623019 = ^x75478B6B
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 5874 at 5-MAR-1997 15:32:55.74
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1229952286 = ^x494F951E
TCP Acknowledge Number = 1967623018 = ^x75478B6A
Window = 1451 = ^x05AB
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 5875 at 5-MAR-1997 15:32:55.74
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1967623019 = ^x75478B6B
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace XMT packet seq # = 6008 at 5-MAR-1997 15:33:09.69
IP Version = 4, IHL = 5, TOS = 00, Total Length = 41 = ^x0029
TCP Sequence Number = 1967623019 = ^x75478B6B
TCP Acknowledge Number = 1229952287 = ^x494F951F
Window = 16384 = ^x4000
-----------------------------------------------------------------------
UCX INTERnet trace RCV packet seq # = 6009 at 5-MAR-1997 15:33:09.75
IP Version = 4, IHL = 5, TOS = 00, Total Length = 40 = ^x0028
TCP Sequence Number = 1229952287 = ^x494F951F
TCP Acknowledge Number = 1967623020 = ^x75478B6C
Window = 0 = ^x0000
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