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

[john bougs]

thanks, checked that.  the timers seem to be ok.

--- On Tue, 1/27/09, bill <address@hidden> wrote:

> From: bill <address@hidden>
> Subject: RE: [lwip-users] lwip does not ack retransmissions
> To: "'Mailing list for lwIP users'" <address@hidden>
> Date: Tuesday, January 27, 2009, 6:15 AM
> 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?
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > lwip-users mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/lwip-users
> 
> 
> 
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