RE: [lwip-users] lwip does not ack retransmissions

[bill]

In a NO_SYS environment, be sure you're calling all of the xxxx_tmr
functions at the right times.  I had a problem similar to yours before I
found out that the system timer was running slower than I expected.  I
wasn't calling these 'tmr' functions fast enough.  It initially worked but
eventually the slower timers caught up with me.

Bill

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On
> Behalf Of john bougs
> Sent: Monday, January 26, 2009 5:06 PM
> To: address@hidden
> Subject: [lwip-users] lwip does not ack retransmissions
> 
> I have been having problems with lwip receiving retransmitted packets.
> 
> The attached wireshark capture is typical of the problem.
> 
> .107 is lwip, .102 is a telnet session on Windows where I have cut and
> pasted a file. 40K file.  A large portion of the file is transfered
> successfully before the capture.
> 
> @ packet 37 relative sequence 192 packet is transmitted with len = 128
> @ packet 45 we start getting duplicate acks  = 192
> @ packet 47 sequence 192 is resent ... this time only one byte
> @ packet 52 we get ack = 193
> @ packet 53 we start getting duplicate ack = 193
> @ packet 56 seq 193 is transmitted len = 1
> @ packet 62 ack=194
> @ packet 63 we start getting duplicate ack = 194
> 
> up to this point things have been pretty consistent, after this point
> specifics may change slightly from run to run, but in all cases all we
> get are duplicate acks.
> 
> I am using lwip 1.3 on NXP LPC2368 with the following settings:
> 
> #define LWIP_DHCP 0
> #define MEM_ALIGNMENT   4
> #define NO_SYS          1
> #define LWIP_SOCKET                     0
> #define LWIP_NETCONN                    0
> #define TCP_WND 512
> #define PBUF_POOL_BUFSIZE (128+56)
> #define PBUF_POOL_SIZE 8
> #define IP_REASS_MAX_PBUFS              6
> 
> 
> if I return PBUF_POOL_BUFSIZE, PBUF_POOL_SIZE and  IP_REASS_MAX_PBUFS
> to the defaults, things recover after a few seconds rather than going
> completly dead.
> 
> does anyone have any suggestion on what the problem may be?
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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