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Re: [Openvpn-users] TCP over TCP Tunnel - Packet lost


  • Subject: Re: [Openvpn-users] TCP over TCP Tunnel - Packet lost
  • From: Alon Bar-Lev <alon.barlev@xxxxxxxxx>
  • Date: Fri, 07 Jul 2006 18:08:39 +0300

Rainer Sokoll wrote:
> You may consider switching to UDP:
> http://sites.inka.de/~W1011/devel/tcp-tcp.html

Thanks!
But I am not able to.

But I've tried to use UDP... And I've surprised to find the same!!!

It is not the tunnel fault!
I thought that the TCP retransmission is because the TCP over TCP...
But even if I work TCP over UDP I get the same problem...

Strange...

No.     Time        Source                Destination           Protocol Info
       1 0.000000    10.0.0.18             192.168.223.6         TCP      imap > 48133 [ACK] Seq=0 Ack=0 Win=64998 Len=0
       2 0.442265    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: 0ihKWMp66tkCYZ7GGqV0musCYTEvcDXoHLVqdxtJLVUwNeRWq20IVp4rjYljmp7tWsk
       3 0.442307    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=0 Win=1002 Len=0 TSV=20193454 TSER=14495030
       4 0.548217    10.0.0.18             192.168.223.6         IMAP     Response: fLVqho9JqvD+lEj5almk+aPR2CXZa1jvqp4JHTRzeQzMKbnkpPjZC1f28YV
       5 0.548263    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=1340 Win=1002 Len=0 TSV=20193480 TSER=14495030
       6 0.555660    10.0.0.18             192.168.223.6         TCP      [TCP Dup ACK 4#1] imap > 48133 [ACK] Seq=1340 Ack=0 Win=64998 Len=0
       7 0.636272    10.0.0.18             192.168.223.6         TCP      [TCP Previous segment lost] imap > 48133 [ACK] Seq=2680 Ack=0 Win=64998 Len=0
       8 1.103753    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: pGjJNZQV83DhGtU2NYLpkQiHekN97AMxxhT0WJd1Wq85bkFgzol
       9 1.103798    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=2680 Win=1002 Len=0 TSV=20193619 TSER=14495036
      10 1.212159    10.0.0.18             192.168.223.6         IMAP     Response: 7n/1CoKruaDwhuf19yf4jIyXFhjgqt4KSreQ7tQLkJd
      11 1.212201    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=4020 Win=1002 Len=0 TSV=20193646 TSER=14495037
      12 1.216934    10.0.0.18             192.168.223.6         TCP      [TCP Dup ACK 10#1] imap > 48133 [ACK] Seq=4020 Ack=0 Win=64998 Len=0
      13 1.305821    10.0.0.18             192.168.223.6         TCP      [TCP Previous segment lost] imap > 48133 [ACK] Seq=5360 Ack=0 Win=64998 Len=0
      14 1.972232    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: EPtdiM9SlA5lC4slXCgL8/PqTpOObxQOTxb
      15 1.972274    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=5360 Win=1002 Len=0 TSV=20193836 TSER=14495045
      16 2.087564    10.0.0.18             192.168.223.6         IMAP     Response: GohJH6wz8dt3677bEZ6ruhjQ2wD
      17 2.087608    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=6700 Win=1002 Len=0 TSV=20193865 TSER=14495046
      18 2.100663    10.0.0.18             192.168.223.6         TCP      [TCP Dup ACK 16#1] imap > 48133 [ACK] Seq=6700 Ack=0 Win=64998 Len=0
      19 2.175291    10.0.0.18             192.168.223.6         TCP      [TCP Previous segment lost] imap > 48133 [ACK] Seq=8040 Ack=0 Win=64998 Len=0
      20 2.629721    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: XALWvscfg1Ts9Pk4Ubx
      21 2.629762    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=8040 Win=1002 Len=0 TSV=20194000 TSER=14495052
      22 2.733416    10.0.0.18             192.168.223.6         IMAP     Response: ZWySo/ouKwi
      23 2.733454    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=9380 Win=1002 Len=0 TSV=20194026 TSER=14495052
      24 2.740367    10.0.0.18             192.168.223.6         TCP      [TCP Dup ACK 22#1] imap > 48133 [ACK] Seq=9380 Ack=0 Win=64998 Len=0
      25 2.832725    10.0.0.18             192.168.223.6         TCP      [TCP Previous segment lost] imap > 48133 [ACK] Seq=10720 Ack=0 Win=64998 Len=0
      26 3.285594    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: /ti
      27 3.285636    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=10720 Win=1002 Len=0 TSV=20194164 TSER=14495058
      28 3.407313    10.0.0.18             192.168.223.6         IMAP     Response: qWTlvlLiRsLGq/rxTVs/z4ZTUk08r2Phqs2J8M1anVadb49MqvVONCQjmQNhK5xBLlJPa
      29 3.407359    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=12060 Win=1002 Len=0 TSV=20194195 TSER=14495059
      30 3.422201    10.0.0.18             192.168.223.6         TCP      [TCP Dup ACK 28#1] imap > 48133 [ACK] Seq=12060 Ack=0 Win=64998 Len=0
      31 3.504697    10.0.0.18             192.168.223.6         TCP      [TCP Previous segment lost] imap > 48133 [ACK] Seq=13400 Ack=0 Win=64998 Len=0
      32 4.049951    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: j6DfmNtRcxVAvS7lKzK+d26DIYSR7SScfgmRlYsh7R6Dk8wlkjP7Bei5XYlkn
      33 4.049994    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=13400 Win=1002 Len=0 TSV=20194355 TSER=14495066
      34 4.159911    10.0.0.18             192.168.223.6         IMAP     Response: E8mW5/OsMoqs3HKK0XnbFQ2ebHZLJVcsjNBz5I73d9Gc2t4p9VCyX
      35 4.159949    192.168.223.6         10.0.0.18             TCP      48133 > imap [ACK] Seq=0 Ack=14740 Win=1002 Len=0 TSV=20194383 TSER=14495066
      36 4.162183    10.0.0.18             192.168.223.6         TCP      [TCP Dup ACK 34#1] imap > 48133 [ACK] Seq=14740 Ack=0 Win=64998 Len=0
      37 4.265463    10.0.0.18             192.168.223.6         TCP      [TCP Previous segment lost] imap > 48133 [ACK] Seq=16080 Ack=0 Win=64998 Len=0
      38 4.816362    10.0.0.18             192.168.223.6         IMAP     [TCP Retransmission] Response: OasfiayDhHM07luqvUM/3R5Sh2JazeJdtj1475/A9JSMV
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