Re: [lwip-users] Need help with missing-ack

[Jani Monoses]

> My problem
> ----------
> When running on my Hitachi target boards, the 'shell' application
> stalls because it skips an ACK number when transferring data.  What I
what do you mean it skips the ACK?
I see jake sends the ACK 592 and telnet goes on to send 593:

> telnet to the target board from my Linux box and issue the 'stat'
> command when the shell prompt comes up.  Almost always the stat
> command never finishes printing (it does complete sometimes, but I
> have not be able to issue the stat command three times in a row
> without it hanging). For other network traffic such as HTTP, PING,
> TCP, UDP and evening using the 'manual' connection commands in the
> shell appear to work fine(though I have not put them under stress).

After the shell hangs I suppose you can ping the board right?

> 192.168.1.104.telnet > jake.local.33944: P [tcp sum ok] 568:592(24)
> ack 34 win 8096 (DF) (ttl 255, id 46, len 64)

> jake.local.33944
> > 192.168.1.104.telnet: . [tcp sum ok] 34:34(0) ack 592 win 5840 (DF)
jake sends ACK

> 192.168.1.104.telnet > jake.local.33944: P [tcp sum ok] 593:619(26)
> ack 34 win 8096 (DF) (ttl 255, id 49, len 66)
telnet goes ahead with next push

> jake.local.33944
> > 192.168.1.104.telnet: . [tcp sum ok] 34:34(0) ack 592 win 5840 (DF)

> 192.168.1.104.telnet > jake.local.33944: P [tcp sum ok] 593:619(26)
> ack 34 win 8096 (DF) (ttl 255, id 51, len 66)

looks like the host telnet does not ACK what it gets from the target...