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From: Ezra Gilbert ( )
Date: Thu Jul 01 2004 - 19:11:17 EDT


Has anyone ever noticed that using Exceed XDMCP over VPN take about 20
seconds whereas without VPN its almost instant? I am running:
Exceed 6.2.0.0 on Windows XP
Redhat 8.0

Using ethereal I was able to log the traffic and see that when I am over
VPN, Exceed does about 9 extra steps (trying to connect to echo, telnet,
and time) that it doesn't do without the VPN.

As you can see in the log below, Exceed tries to connect to echo (packets
7-12), telnet (packets 13-18), and time (packets 19-24). This whole
process took about 45 seconds. None of it happens when I am not on a VPN.

Help resolving this would definitely be appreciated.

Here is an ethereal log that shows what I am describing:

No. Time Source Destination Protocol
Info
      1 0.000000 WindowsXP Broadcast ARP Who
has RedHat? Tell WindowsXP
      2 0.000012 RedHat WindowsXP ARP RedHat is
at 00:ff:ff:01:01:01
      3 0.000020 WindowsXP RedHat XDMCP
Indirect_query
      4 0.009470 RedHat WindowsXP XDMCP Willing
      5 2.046992 WindowsXP RedHat XDMCP
Indirect_query
      6 2.052956 RedHat WindowsXP XDMCP Willing
      7 4.472847 WindowsXP RedHat TCP 1630 >
echo [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
      8 4.476363 RedHat WindowsXP ICMP
Destination unreachable
      9 7.424687 WindowsXP RedHat TCP 1630 >
echo [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     10 7.428163 RedHat WindowsXP ICMP
Destination unreachable
     11 13.433315 WindowsXP RedHat TCP 1630 >
echo [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     12 13.437406 RedHat WindowsXP ICMP
Destination unreachable
     13 25.451225 WindowsXP RedHat TCP 1630 >
telnet [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     14 25.454603 RedHat WindowsXP ICMP
Destination unreachable
     15 28.354788 WindowsXP RedHat TCP 1630 >
telnet [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     16 28.358302 RedHat WindowsXP ICMP
Destination unreachable
     17 34.363411 WindowsXP RedHat TCP 1630 >
telnet [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     18 34.366821 RedHat WindowsXP ICMP
Destination unreachable
     19 46.380841 WindowsXP RedHat TCP 1630 >
time [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     20 46.384294 RedHat WindowsXP ICMP
Destination unreachable
     21 49.385030 WindowsXP RedHat TCP 1630 >
time [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     22 49.388503 RedHat WindowsXP ICMP
Destination unreachable
     23 55.393651 WindowsXP RedHat TCP 1630 >
time [SYN] Seq=0 Ack=0 Win=16384 Len=0 MSS=1188
     24 55.397029 RedHat WindowsXP ICMP
Destination unreachable
     25 67.411121 WindowsXP RedHat XDMCP Request
     26 67.419107 RedHat WindowsXP XDMCP Accept
     27 67.441098 WindowsXP RedHat XDMCP Manage
     28 67.450141 RedHat WindowsXP TCP 2509 >
6000 [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=79883054 TSER=0 WS=0
     29 67.450189 WindowsXP RedHat TCP 6000 >
2509 [SYN, ACK] Seq=0 Ack=1 Win=16632 Len=0 MSS=1188 WS=0 TSV=0 TSER=0
     30 67.453412 RedHat WindowsXP TCP 2509 >
6000 [ACK] Seq=1 Ack=1 Win=5840 Len=0 TSV=79883054 TSER=0
     31 67.454332 RedHat WindowsXP X11 Initial
connection request
     32 67.454530 WindowsXP RedHat X11 Initial
connection reply



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