[lwip-users] about lwip TCP/IP paratmers
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yueyue papa
Mar 17, 2009, 5:38:13 AM3/17/09
to Mailing list for lwIP users
Hi all,
I meet the problem in lwIP working on the poor GPRS network.
I could see connection lost in the GPRS network: lwIP send FIN, so the connection is losted.
Where is the parameters I could config this
1. Resend time out
2. FIN send timeout
I could see there is out of sequance package,
What is the meaning of
#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
I changed the data to 60, but more worse
Lee
I meet the problem in lwIP working on the poor GPRS network.
I could see connection lost in the GPRS network: lwIP send FIN, so the connection is losted.
Where is the parameters I could config this
1. Resend time out
2. FIN send timeout
I could see there is out of sequance package,
What is the meaning of
#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
I changed the data to 60, but more worse
Lee
yueyue papa
Mar 17, 2009, 7:03:12 AM3/17/09
to Mailing list for lwIP users
My test case:
lwip in Echo server
211.xxx --> 192.xxx.xx
211.xxx send 209 byte, and wait echo server to echo back. If link break do connection again. I do not want the link break. But in the No 94: the connection is finished.
Is there any parameter I could changed to increase the resend times, resend .... , so as to not meet such kind of break.
90% link is break by lwIP first. Could I make lwIP not send the FIN to stop the connection
Lee
lwip in Echo server
211.xxx --> 192.xxx.xx
211.xxx send 209 byte, and wait echo server to echo back. If link break do connection again. I do not want the link break. But in the No 94: the connection is finished.
Is there any parameter I could changed to increase the resend times, resend .... , so as to not meet such kind of break.
90% link is break by lwIP first. Could I make lwIP not send the FIN to stop the connection
Lee
Kieran Mansley
Mar 17, 2009, 7:19:19 AM3/17/09
to Mailing list for lwIP users
On Tue, 2009-03-17 at 17:38 +0800, yueyue papa wrote:
> Hi all,
>
> I meet the problem in lwIP working on the poor GPRS network.
>
> I could see connection lost in the GPRS network: lwIP send FIN, so the
> connection is losted.
> Hi all,
>
> I meet the problem in lwIP working on the poor GPRS network.
>
> I could see connection lost in the GPRS network: lwIP send FIN, so the
> connection is losted.
lwIP normally only sends a FIN when the connection is closed by the
application. If something were timing out in the stack it would instead
be either just dropping the connection or sending a RST to abort the
connection. This suggests that your application is giving up on the
connection, and so changing the timers in lwIP won't make any
difference.
Kieran
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yueyue papa
Mar 17, 2009, 8:29:34 AM3/17/09
to Mailing list for lwIP users
>>lwIP normally only sends a FIN when the connection is closed by the
application.
application.
I do not agree this statement. I always find lwIP first FIN the connection. The connection is not close by remote.
Kieran Mansley
Mar 17, 2009, 8:39:07 AM3/17/09
to Mailing list for lwIP users
On Tue, 2009-03-17 at 20:29 +0800, yueyue papa wrote:
> >>lwIP normally only sends a FIN when the connection is closed by the
> application.
> I do not agree this statement. I always find lwIP first FIN the
> connection. The connection is not close by remote.
> >>lwIP normally only sends a FIN when the connection is closed by the
> application.
> I do not agree this statement. I always find lwIP first FIN the
> connection. The connection is not close by remote.
I mean the application running on top of lwIP, not the other end.
yueyue papa
Mar 18, 2009, 4:28:19 AM3/18/09
to Mailing list for lwIP users
thanks Kierean, I check the code, and I understand lwIP really send FIN in socket close.
I have a quertion for how long time will be lwIP resend the lost pacakge?
##############
No. Time Source Destination Protocol Info
1 0.000000 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [SYN] Seq=0 Win=2920 Len=0 MSS=1460
2 0.000524 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460
3 1.414053 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1 Ack=1 Win=2920 Len=0
4 5.055230 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1 Ack=1 Win=2920 Len=198
5 5.062737 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1 Ack=199 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
6 6.316085 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=1 Ack=1 Win=2920 Len=198
7 6.316119 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 5#1] irdmi > 49360 [ACK] Seq=199 Ack=199 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
8 6.935167 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=199 Ack=199 Win=2920 Len=0
9 34.553643 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
10 34.560701 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=199 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=198
11 35.131844 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
12 35.131876 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 10#1] irdmi > 49360 [ACK] Seq=397 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=0
13 35.337657 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
14 35.337687 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 10#2] irdmi > 49360 [ACK] Seq=397 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=0
15 35.713722 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
16 35.713747 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 10#3] irdmi > 49360 [ACK] Seq=397 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=0
17 37.090132 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=397 Ack=397 Win=2920 Len=0
18 42.572425 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=397 Ack=397 Win=2920 Len=198
19 42.579375 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=397 Ack=595 Win=64941 [TCP CHECKSUM INCORRECT] Len=198
20 48.739357 192.168.8.94 211.136.158.37 TCP [TCP Retransmission] irdmi > 49360 [PSH, ACK] Seq=397 Ack=595 Win=64941 [TCP CHECKSUM INCORRECT] Len=198
21 51.099474 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=595 Ack=595 Win=2920 Len=0
22 56.762953 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=595 Ack=595 Win=2920 Len=198
23 56.769989 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=595 Ack=793 Win=64743 [TCP CHECKSUM INCORRECT] Len=198
24 58.345088 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=793 Ack=793 Win=2920 Len=0
25 73.313026 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=793 Ack=793 Win=2920 Len=198
26 73.320700 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=793 Ack=991 Win=64545 [TCP CHECKSUM INCORRECT] Len=198
27 74.817597 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=991 Ack=991 Win=2920 Len=0
28 89.941063 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=991 Ack=991 Win=2920 Len=198
29 89.949603 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=991 Ack=1189 Win=64347 [TCP CHECKSUM INCORRECT] Len=198
30 91.755556 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1189 Ack=1189 Win=2920 Len=0
31 101.679462 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1189 Ack=1189 Win=2920 Len=198
32 101.686505 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1189 Ack=1387 Win=64149 [TCP CHECKSUM INCORRECT] Len=198
33 103.147619 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1387 Ack=1387 Win=2920 Len=0
34 108.376596 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1387 Ack=1387 Win=2920 Len=198
35 108.376952 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [ACK] Seq=1387 Ack=1585 Win=65535 [TCP CHECKSUM INCORRECT] Len=0
36 108.383705 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1387 Ack=1585 Win=65535 [TCP CHECKSUM INCORRECT] Len=198
37 109.797425 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1585 Ack=1585 Win=2920 Len=0
38 173.506679 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1585 Ack=1585 Win=2920 Len=198
39 173.507694 211.136.158.37 192.168.8.94 TCP [TCP Out-Of-Order] 49360 > irdmi [PSH, ACK] Seq=1585 Ack=1585 Win=2920 Len=198
40 173.507731 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
41 173.513621 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
42 178.288443 192.168.8.94 211.136.158.37 TCP [TCP Retransmission] irdmi > 49360 [PSH, ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
43 187.804221 192.168.8.94 211.136.158.37 TCP [TCP Retransmission] irdmi > 49360 [PSH, ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
44 193.154690 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [FIN, ACK] Seq=1783 Ack=1585 Win=2920 Len=0
45 193.155010 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [ACK] Seq=1783 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
46 193.155206 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [FIN, ACK] Seq=1783 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
47 193.318588 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=1585 Ack=1585 Win=2920 Len=198
48 193.318620 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 46#1] irdmi > 49360 [ACK] Seq=1784 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
49 193.357145 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [FIN, ACK] Seq=1783 Ack=1585 Win=2920 Len=0
50 193.357178 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 46#2] irdmi > 49360 [ACK] Seq=1784 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
51 194.657555 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1784 Ack=1784 Win=2721 Len=0
##############
item 38: It is send very later
item 44: H50 send FIN.
between 37, 38, there may be a send package lost, but the resend is very later.
based on previous send time, there must be a package send from 211.xxx, before item 38. （The time will be 11:33:53, and the package is losted due to GPRS.)
but the item 38, showed the package is send in 11:34: 47
I think there is nearly 50s delay for resend.
Question: why the resecend is so later.
Will it caused by TCP Nagle algorithm?
Lee
I have a quertion for how long time will be lwIP resend the lost pacakge?
##############
No. Time Source Destination Protocol Info
1 0.000000 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [SYN] Seq=0 Win=2920 Len=0 MSS=1460
2 0.000524 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460
3 1.414053 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1 Ack=1 Win=2920 Len=0
4 5.055230 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1 Ack=1 Win=2920 Len=198
5 5.062737 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1 Ack=199 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
6 6.316085 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=1 Ack=1 Win=2920 Len=198
7 6.316119 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 5#1] irdmi > 49360 [ACK] Seq=199 Ack=199 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
8 6.935167 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=199 Ack=199 Win=2920 Len=0
9 34.553643 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
10 34.560701 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=199 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=198
11 35.131844 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
12 35.131876 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 10#1] irdmi > 49360 [ACK] Seq=397 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=0
13 35.337657 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
14 35.337687 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 10#2] irdmi > 49360 [ACK] Seq=397 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=0
15 35.713722 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=199 Ack=199 Win=2920 Len=198
16 35.713747 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 10#3] irdmi > 49360 [ACK] Seq=397 Ack=397 Win=65139 [TCP CHECKSUM INCORRECT] Len=0
17 37.090132 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=397 Ack=397 Win=2920 Len=0
18 42.572425 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=397 Ack=397 Win=2920 Len=198
19 42.579375 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=397 Ack=595 Win=64941 [TCP CHECKSUM INCORRECT] Len=198
20 48.739357 192.168.8.94 211.136.158.37 TCP [TCP Retransmission] irdmi > 49360 [PSH, ACK] Seq=397 Ack=595 Win=64941 [TCP CHECKSUM INCORRECT] Len=198
21 51.099474 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=595 Ack=595 Win=2920 Len=0
22 56.762953 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=595 Ack=595 Win=2920 Len=198
23 56.769989 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=595 Ack=793 Win=64743 [TCP CHECKSUM INCORRECT] Len=198
24 58.345088 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=793 Ack=793 Win=2920 Len=0
25 73.313026 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=793 Ack=793 Win=2920 Len=198
26 73.320700 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=793 Ack=991 Win=64545 [TCP CHECKSUM INCORRECT] Len=198
27 74.817597 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=991 Ack=991 Win=2920 Len=0
28 89.941063 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=991 Ack=991 Win=2920 Len=198
29 89.949603 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=991 Ack=1189 Win=64347 [TCP CHECKSUM INCORRECT] Len=198
30 91.755556 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1189 Ack=1189 Win=2920 Len=0
31 101.679462 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1189 Ack=1189 Win=2920 Len=198
32 101.686505 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1189 Ack=1387 Win=64149 [TCP CHECKSUM INCORRECT] Len=198
33 103.147619 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1387 Ack=1387 Win=2920 Len=0
34 108.376596 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1387 Ack=1387 Win=2920 Len=198
35 108.376952 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [ACK] Seq=1387 Ack=1585 Win=65535 [TCP CHECKSUM INCORRECT] Len=0
36 108.383705 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1387 Ack=1585 Win=65535 [TCP CHECKSUM INCORRECT] Len=198
37 109.797425 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1585 Ack=1585 Win=2920 Len=0
38 173.506679 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [PSH, ACK] Seq=1585 Ack=1585 Win=2920 Len=198
39 173.507694 211.136.158.37 192.168.8.94 TCP [TCP Out-Of-Order] 49360 > irdmi [PSH, ACK] Seq=1585 Ack=1585 Win=2920 Len=198
40 173.507731 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
41 173.513621 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [PSH, ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
42 178.288443 192.168.8.94 211.136.158.37 TCP [TCP Retransmission] irdmi > 49360 [PSH, ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
43 187.804221 192.168.8.94 211.136.158.37 TCP [TCP Retransmission] irdmi > 49360 [PSH, ACK] Seq=1585 Ack=1783 Win=65337 [TCP CHECKSUM INCORRECT] Len=198
44 193.154690 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [FIN, ACK] Seq=1783 Ack=1585 Win=2920 Len=0
45 193.155010 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [ACK] Seq=1783 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
46 193.155206 192.168.8.94 211.136.158.37 TCP irdmi > 49360 [FIN, ACK] Seq=1783 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
47 193.318588 211.136.158.37 192.168.8.94 TCP [TCP Retransmission] 49360 > irdmi [PSH, ACK] Seq=1585 Ack=1585 Win=2920 Len=198
48 193.318620 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 46#1] irdmi > 49360 [ACK] Seq=1784 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
49 193.357145 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [FIN, ACK] Seq=1783 Ack=1585 Win=2920 Len=0
50 193.357178 192.168.8.94 211.136.158.37 TCP [TCP Dup ACK 46#2] irdmi > 49360 [ACK] Seq=1784 Ack=1784 Win=65337 [TCP CHECKSUM INCORRECT] Len=0
51 194.657555 211.136.158.37 192.168.8.94 TCP 49360 > irdmi [ACK] Seq=1784 Ack=1784 Win=2721 Len=0
##############
item 38: It is send very later
item 44: H50 send FIN.
between 37, 38, there may be a send package lost, but the resend is very later.
based on previous send time, there must be a package send from 211.xxx, before item 38. （The time will be 11:33:53, and the package is losted due to GPRS.)
but the item 38, showed the package is send in 11:34: 47
I think there is nearly 50s delay for resend.
Question: why the resecend is so later.
Will it caused by TCP Nagle algorithm?
Lee
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