Re: [lwip-users] strange TCP ack

[yueyue papa]

>>Have you attached the right packet capture?
i check. It is right.

>>The IP addresses don't match the ones in your email,
I am not understand. One is 192.168.8.130, another is 192.168.8.40.
There are only two IP address in the capture.

>> I can't see either end ACKing 1024 bytes of a segment.
Item 4:  192.168.8.40 send 1400 bytes to 192.168.8.130 (server in vista)
Item 5:  192.168.8.130 only ack 1025. 1400 is get, it should ack 1401
(like item 7)
Item 6:  Due to the windows strange ACK, lwIP resend after 5s
Item 7:  acked by lwIP.  One echo finihsed.

I am not understand this flow.

1. why lwIP resend after 5s.
2. why windows ack 1025.


On 4/27/10, Kieran Mansley <address@hidden> wrote:
> On Tue, 2010-04-27 at 18:45 +0800, yueyue papa wrote:
>> Hi All,
>>
>> I meet a windows TCP/IP strange behavior.
>>
>>
>> 192.168.8.130: my vista echo server.
>>
>> 192.168.8.40: lwIP is running.
>>
>> lwip  sends 1400 bytes to windows for echo, but windows ack 1025 (item 5)
>> and then after 5s, lwIP resend the 1400 segment.  vista ack the 1401 data
>> again.
>
> Have you attached the right packet capture?  The IP addresses don't
> match the ones in your email, and I can't see either end ACKing 1024
> bytes of a segment.  Perhaps, if it is the right packet capture, you can
> mention which frames in the capture you think are odd?
>
> Kieran
>
>
>
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