From: [EMAIL PROTECTED]: [EMAIL PROTECTED]: [lwip] HTTP Server trafficDate:
Mon, 4 Dec 2006 10:11:25 +0000
Hi all, I am using lwip 1.1.1 where i am running a HTTP webserver on an
embedded system which is running FreeRTOS, and i have some questions regarding
the HTTP traffic. I am running the demo application called
"lwIP_Demo_Rowley_ARM7".Which i have modified with the example from Adam
dunkels httpd.c. If i compare the traffic from the webserver to a PC client and
a PC webserver to a PC client. The traffic differs, see ethereal capture below:
Embedded webserver -> PC client:No. Time1 0.000000 192.168.2.206
192.168.2.204 TCP 1906 > http [SYN] Seq=0 Len=0 MSS=14602
0.000726 192.168.2.204 192.168.2.206 TCP http > 1906
[SYN, ACK] Seq=0 Ack=1 Win=1500 Len=0 MSS=14603 0.000786 192.168.2.206
192.168.2.204 TCP 1906 > http [ACK] Seq=1 Ack=1 Win=65535
Len=04 0.001161 192.168.2.206 192.168.2.204 HTTP GET
/sojlegraf.htm HTTP/1.15 0.002128 192.168.2.204 192.168.2.206
TCP http > 1906 [ACK] Seq=1 Ack=423 Win=1500 Len=06 0.005180
192.168.2.204 192.168.2.206 HTTP HTTP/1.1 200 OK
(text/html)7 0.107250 192.168.2.206 192.168.2.204 TCP
1906 > http [ACK] Seq=423 Ack=1461 Win=65535 Len=08 0.108553 192.168.2.204
192.168.2.206 HTTP Continuation or non-HTTP traffic9
0.307498 192.168.2.206 192.168.2.204 TCP 1906 > http
[ACK] Seq=423 Ack=2073 Win=64923 Len=0....17 0.347766 192.168.2.206
192.168.2.204 HTTP GET /wz_jsgraphics.js HTTP/1.118 0.348585
192.168.2.204 192.168.2.206 TCP http > 1908 [ACK] Seq=1
Ack=279 Win=1500 Len=019 0.349381 192.168.2.204 192.168.2.206
HTTP HTTP/1.1 200 OK (application/x-javascript)20 0.507802
192.168.2.206 192.168.2.204 TCP 1908 > http [ACK] Seq=279
Ack=61 Win=65475 Len=0....56 0.536547 192.168.2.206 192.168.2.204
TCP 1908 > http [ACK] Seq=279 Ack=18061 Win=65535 Len=057 0.538502
192.168.2.204 192.168.2.206 HTTP Continuation or non-HTTP
traffic58 0.708082 192.168.2.206 192.168.2.204 TCP 1908
> http [ACK] Seq=279 Ack=19442 Win=64154 Len=0....62 0.728996 192.168.2.204
192.168.2.206 TCP http > 1908 [ACK] Seq=19443 Ack=280
Win=1499 Len=0 as you can see in the above, there are sometimes some funny
jumps in time, it takes for the PC client to ACK the incomming data.Between
packet numbers: 8 and 9, 19 and 20, 57 and 58. PC webserver -> PC client:No.
Time1 0.000000 192.168.2.206 xxx.xxx.207.21 TCP 2447
> http [SYN] Seq=0 Len=0 MSS=14602 0.001606 xxx.xxx.207.21
192.168.2.206 TCP http > 2447 [SYN, ACK] Seq=0 Ack=1 Win=65535
Len=0 MSS=14603 0.001655 192.168.2.206 xxx.xxx.207.21 TCP
2447 > http [ACK] Seq=1 Ack=1 Win=65535 Len=04 0.002095 192.168.2.206
xxx.xxx.207.21 HTTP GET /performance/kurvegraf.htm HTTP/1.15
0.004400 xxx.xxx.207.21 192.168.2.206 TCP [TCP
segment of a reassembled PDU]6 0.004807 xxx.xxx.207.21
192.168.2.206 HTTP HTTP/1.1 200 OK (text/html)7 0.004859
192.168.2.206 xxx.xxx.207.21 TCP 2447 > http [ACK]
Seq=458 Ack=2219 Win=65535 Len=08 0.041431 192.168.2.206
xxx.xxx.207.21 HTTP GET /performance/wz_jsgraphics.js HTTP/1.19
0.044008 xxx.xxx.207.21 192.168.2.206 TCP [TCP segment
of a reassembled PDU]10 0.044518 xxx.xxx.207.21 192.168.2.206
TCP [TCP segment of a reassembled PDU]11 0.044590 192.168.2.206
xxx.xxx.207.21 TCP 2447 > http [ACK] Seq=770 Ack=5139 Win=65535
Len=012 0.044617 xxx.xxx.207.21 192.168.2.206 TCP [TCP
segment of a reassembled PDU]13 0.046418 xxx.xxx.207.21
192.168.2.206 TCP [TCP segment of a reassembled PDU]14 0.046871
192.168.2.206 xxx.xxx.207.21 TCP 2447 > http [ACK]
Seq=770 Ack=7775 Win=65535 Len=015 0.046899 xxx.xxx.207.21
192.168.2.206 TCP [TCP segment of a reassembled PDU]16 0.046938
xxx.xxx.207.21 192.168.2.206 TCP [TCP segment of a
reassembled PDU]17 0.047016 192.168.2.206 xxx.xxx.207.21
TCP 2447 > http [ACK] Seq=770 Ack=10411 Win=65535 Len=018 0.048962
xxx.xxx.207.21 192.168.2.206 TCP [TCP segment of a
reassembled PDU]19 0.049446 xxx.xxx.207.21 192.168.2.206
TCP [TCP segment of a reassembled PDU]20 0.049509 192.168.2.206
xxx.xxx.207.21 TCP 2447 > http [ACK] Seq=770 Ack=13331 Win=65535
Len=0....31 0.169528 192.168.2.206 xxx.xxx.207.21 TCP
2447 > http [ACK] Seq=770 Ack=21841 Win=65217 Len=0 as you can see in the above
there isnt't those jumps in time before a packet is ACK'ed. So my question is,
how do i make my communication between, my embedded target and the PC client
run as smoothly as running the websiteon a PC webserver ?Is that even possible
with lwip ? best regards,Martin B.
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