Ethereal-users: [Ethereal-users] Game lags - many TCP retransmissions?

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From: "Dominik Schneider" <drsnuggles@xxxxxx>
Date: Tue, 20 Apr 2004 20:24:34 +0200
I started to play the online game DarkSpace with my DSL line when I noticed
quite fast that its laggy all the time. Using my ISDN connection I've got no
game lags and whatsoever thus i thought my DSL line is bad or parameters
like MTU and so on are not correct. I checked everything, a loop-ping on my
first hop with 1400 bytes reported no packet loss and my MTU (1460), MSS
(1420) and RWIN (62480) should be correct for my ISP. I also used another
ISP to check if its a routing problem of the ISP but the problem remains.

Now I used ethereal to log the connection and the first lags and look what
I've got (just one slice of the log):

    No. Time        Source                Destination           Protocol
Info
   1933 12.784637   209.198.154.19        80.139.45.149         TCP
[TCP Dup ACK 1533#119] 9020 > 1082 [ACK] Seq=22130 Ack=1887 Win=65079 Len=0
TSV=12526852 TSER=5180 SLE=2919270843 SRE=2919270855 SLE=2919270699
SRE=2919270711
   1934 12.796945   209.198.154.19        80.139.45.149         TCP
[TCP Dup ACK 1533#120] 9020 > 1082 [ACK] Seq=22130 Ack=1887 Win=65079 Len=0
TSV=12526852 TSER=5180 SLE=2919270927 SRE=2919270939 SLE=2919270843
SRE=2919270855
   1935 12.812963   209.198.154.19        80.139.45.149         TCP
[TCP Dup ACK 1533#121] 9020 > 1082 [ACK] Seq=22130 Ack=1887 Win=65079 Len=0
TSV=12526853 TSER=5180 SLE=2919271071 SRE=2919271083 SLE=2919270927
SRE=2919270939
   1936 12.824290   209.198.154.19        80.139.45.149         TCP
9020 > 1082 [PSH, ACK] Seq=22130 Ack=1899 Win=65067 Len=12 TSV=12526853
TSER=5201
   1937 12.824497   80.139.45.149         209.198.154.19        TCP
1082 > 9020 [ACK] Seq=18282 Ack=22142 Win=61940 Len=1408 TSV=5219
TSER=12526853
   1938 12.824518   80.139.45.149         209.198.154.19        TCP
1082 > 9020 [ACK] Seq=19690 Ack=22142 Win=61940 Len=1408 TSV=5219
TSER=12526853
   1939 12.824535   80.139.45.149         209.198.154.19        TCP
1082 > 9020 [PSH, ACK] Seq=21098 Ack=22142 Win=61940 Len=497 TSV=5219
TSER=12526853
   1940 12.837604   209.198.154.19        80.139.45.149         TCP
9020 > 1082 [ACK] Seq=22142 Ack=1899 Win=65067 Len=0 TSV=12526853 TSER=5201
SLE=2919271335 SRE=2919271347 SLE=2919271071 SRE=2919271083
   1941 12.839580   80.139.45.149         209.198.154.19        TCP
[TCP Retransmission] 1082 > 9020 [PSH, ACK] Seq=1899 Ack=22142 Win=61940
Len=12 TSV=5219 TSER=12526853
   1942 12.839586   80.139.45.149         209.198.154.19        TCP
[TCP Retransmission] 1082 > 9020 [PSH, ACK] Seq=2007 Ack=22142 Win=61940
Len=12 TSV=5219 TSER=12526853
   1943 12.839588   80.139.45.149         209.198.154.19        TCP
[TCP Retransmission] 1082 > 9020 [PSH, ACK] Seq=2127 Ack=22142 Win=61940
Len=12 TSV=5219 TSER=12526853
   1944 12.839590   80.139.45.149         209.198.154.19        TCP
[TCP Retransmission] 1082 > 9020 [PSH, ACK] Seq=2284 Ack=22142 Win=61940
Len=12 TSV=5219 TSER=12526853
   1945 12.839592   80.139.45.149         209.198.154.19        TCP
[TCP Retransmission] 1082 > 9020 [PSH, ACK] Seq=2392 Ack=22142 Win=61940
Len=12 TSV=5219 TSER=12526853
   1946 12.839594   80.139.45.149         209.198.154.19        TCP
[TCP Retransmission] 1082 > 9020 [PSH, ACK] Seq=2500 Ack=22142 Win=61940
Len=12 TSV=5219 TSER=12526853

Is it possible to tell out of this whats the real problem?

TIA

Dominik