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--- On Mon, 1/26/09, john bougs <[email protected]> wrote: > From: john bougs <[email protected]> > Subject: [lwip-users] lwip does not ack retransmissions > To: [email protected] > 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? > > > > > > > > > > > _______________________________________________ > lwip-users mailing list > [email protected] > http://lists.nongnu.org/mailman/listinfo/lwip-users
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