[lwip-users] connect RST question

[yueyue papa]

Hi All,

 

I use lwIP + PPP in GPRS environement.

 

The connect could success in sometime, but could failure for 40%. Here is my log

...

     22 22:46:14.774823 192.168.0.104         10.9.0.1          TCP      8080 > 16550 [ACK] Seq=329 Ack=273 Win=65264 Len=0
     23 22:46:14.775386 192.168.0.104         10.9.0.1          TCP      8080 > 16550 [FIN, ACK] Seq=329 Ack=273 Win=65264 Len=0
     24 22:46:15.750435 10.9.0.1          192.168.0.104         TCP      16550 > 8080 [ACK] Seq=273 Ack=330 Win=2919 Len=0
     25 22:46:54.623132 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     26 22:46:54.623541 192.168.0.104         10.9.0.1          TCP      8080 > 17357 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460
     27 22:46:54.663688 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     28 22:46:54.700646 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     29 22:46:54.743165 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     30 22:46:54.780492 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     31 22:46:54.799406 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     32 22:46:55.014573 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     33 22:46:55.074610 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     34 22:46:55.131491 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     35 22:46:55.819626 10.9.0.1          192.168.0.104         TCP      17357 > 8080 [RST, ACK] Seq=1 Ack=1 Win=2920 Len=0

...

     70 22:48:47.710393 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     71 22:48:47.710422 192.168.0.104         10.9.0.1          TCP      8080 > 19881 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460
     72 22:48:47.723735 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     73 22:48:47.761691 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     74 22:48:47.802748 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     75 22:48:47.870328 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     76 22:48:47.879713 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     77 22:48:47.898218 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     78 22:48:48.095996 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     79 22:48:48.174374 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [SYN] Seq=0 Len=0 MSS=1452
     80 22:48:48.879282 10.9.0.1          192.168.0.104         TCP      19881 > 8080 [RST, ACK] Seq=1 Ack=1 Win=2920 Len=0

 

From the log, I feel GPRS network has extremely long delay. (Data is hold in sometime, and then data will be transfered in certain time.)  If this case happen, RST will be send, so the connection failure.

 

Is this the normal case in GPRS network? Is there suggest configured parameter for GPRS network?

 

Thanks

Lee