Re: [lwip-users] seq number & ACK issue

[Kieran Mansley]

On Tue, 2010-03-02 at 17:22 +0700, PHAM ANH THIEN wrote:
> 
> So do you know where unacked->seqno is calculated in the code?

There is a list of unacked packets in each pcb (called pcb->unacked) and
the seqno of this list will be the sequence number in the header of the
first packet on this list.  For example, the print statement you refer
to accesses this value like this:

      LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: ACK for %"U32_F", 
unacked->seqno %"U32_F":%"U32_F"\n",
                                    ackno,
                                    pcb->unacked != 
NULL?ntohl(pcb->unacked->tcphdr->seqno): 0,
                                    pcb->unacked != 
NULL?ntohl(pcb->unacked->tcphdr->seqno) + TCP_TCPLEN(pcb->unacked): 0));

I notice that it is printing unsiged values, so how you got a negative
result I don't know.

Kieran