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Re: [lwip-users] about lwip TCP/IP paratmers


From: yueyue papa
Subject: Re: [lwip-users] about lwip TCP/IP paratmers
Date: Wed, 18 Mar 2009 16:28:19 +0800

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


On Tue, Mar 17, 2009 at 8:39 PM, Kieran Mansley <address@hidden> wrote:
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.

I mean the application running on top of lwIP, not the other end.

Kieran





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