2008/3/20, Jonathan Larmour <[EMAIL PROTECTED]>: > > Piero 74 wrote: > > here i attached a wireshark file... > > > > I didn't understand what is the problem.... > > Anyone can explain me?? > > > > > my ip board is 192.168.0.101 <http://192.168.0.101> > > pc ip is 192.169.0.1 <http://192.169.0.1> > > Great! That's exactly what was needed. According to that, clearly the PC > is > not ACKing the further sends, hence you eventually running out of send > buffer space. > > Why is it not acking? According to my dump, the first unacked packet from > your ip board to the PC has a bad checksum: > > 09:28:34.359638 00:bd:33:02:64:24 (oui Unknown) > 00:c0:f0:52:fe:91 (oui > Unknown), ethertype IPv4 (0x0800), length 248: (tos 0x0, ttl 255, id 3, > offset 0, flags [none], proto: TCP (6), length: 234) 192.168.0.101.dnp > > 192.168.0.1.4539: P, cksum 0x018f (incorrect (-> 0x3182), 195:389(194) ack > 1 win 2048 > > Everything in the packet superficially looks ok (lengths, src and > destination IPs etc.) but either the packet has got corrupted, or > somewhere > in your processing of the packet you have modified it without > recalculating > the checksum.
Jifl... i use send function (socket).... i cannot change packet in low level protocols I'm thinking.... it could be possible a problem in my emac driver? but i don't know how i can debug this problem, if there is.... can you help me? Piero Jifl > -- > eCosCentric Limited http://www.eCosCentric.com/ The eCos experts > ** Visit us at ESC Silicon Valley <http://www.embedded.com/esc/sv> ** > ** April 15-17 2008, Booth 3012, San Jose McEnery Convention Center ** > Barnwell House, Barnwell Drive, Cambridge, UK. Tel: +44 1223 245571 > Registered in England and Wales: Reg No 4422071. > ------["Si fractum non sit, noli id reficere"]------ Opinions==mine > > > _______________________________________________ > > lwip-users mailing list > [email protected] > http://lists.nongnu.org/mailman/listinfo/lwip-users >
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