Re: [lwip-users] tcp_data packets

[ramash]

Sample packets shown in attachments hint is see for sequence number(00 00 99
8f)after that packet drop takes place,

Jonathan Larmour wrote:
> 
> ramash wrote:
>> Hi all,
>>     I have been using lwip code to send TCP packets to a client program
>> through serial port.
>>     I am facing the problem that sequence number becomes five bytes 
>>     Initially for TCP packets client send connect packet and server will
>> send accept packet by taking sequence number as acknowledge number and
>> acknowledge number as sequence number,and it is follow on all the
>> packets.
>> 
>>     First the acknowledge number send by acknowledge packet for accept
>> packet is 0x0000196f,after the first data packet send (400 bytes size)the
>> acknowledge number(0x00001964 + 190(400) = 0x00001aff).this will go on
>> for
>> further packet,at one iteration the acknowledge number is 0x00007d5d6f.
>>      Then i solved this problem by masking the 0x7d and made the next
>> byte
>> as 0x5d + 0x20.but a five to ten packets after this packet the sequence
>> number of server(lwip) is junk/garbage value.
> 
> I'm not quite sure what you're saying here. You're saying the ACK number
> is
> 0x00007d5d6f - the non-zero bytes are only three bytes, so do you mean
> that
> the ACK field in the TCP header has increased by a further byte, which is
> zero?
> 
> No-one else has seen this for sure. What version of lwIP are you using and
> where did you get it from?
> 
> Jifl
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http://www.nabble.com/file/p14729661/drop.htm drop.htm 
http://www.nabble.com/file/p14729661/redundant.htm redundant.htm 
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