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

[john bougs]

file attached


--- On Mon, 1/26/09, john bougs <address@hidden> wrote:

> From: john bougs <address@hidden>
> Subject: [lwip-users] lwip does not ack retransmissions
> To: address@hidden
> Date: Monday, January 26, 2009, 2:06 PM
> 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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