On 12/20/2012 12:25 AM, [email protected] wrote:
Mark Lakata wrote:
I think I've gotten closer to the problem. It seems that the size of
the segments that are queued up to be sent by tcp_output are larger
than the 'wnd' size (which is pcb->snd_wnd in this case), and thus
they don't get sent. I'm not sure how this could have happened.
Specifically, this while() loopnever gets entered(line 969 in
tcp_out.c) in tcp_output()
(seg is non NULL)
while (seg != NULL &&
ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len <= wnd) {
because seg->len is bigger than wnd.
Which version of lwIP are you using? (i.e. what does '?' stand for?)
I'm asking because from 1.4.0 to 1.4.1, there have been 2 or 3 bugs
fixed in this area, which should ensure that all segments we create
fit into the window (unless the remote side does not send window
updates according to the TCP spec).
I'm using the head of the ppp-new branch. I'm going to plead almost
complete ignorance of how git works (haven't gotten around to learning
it) and learned just enough to download the ppp-new branch. Has the
ppp-new branch being pushed back into the main line? Is there an easy
way of merging the two branches together? Does that sentence even make
sense? I need the ppp-new branch, since I had trouble with the released
ppp code, which I think was 1.4.0.
If 1.4.1 does not fix this, what is your MSS size, what are the
connection's TX/RX window sizes and what OS or IP stack is your peer
running?
I'm not sure how to get the size of the "connections's TX/RX window
sizes". Here is a snippet from the lwipopts.h. The peer is Windows 7
Google Chrome.
#define LWIP_TCP 1
#define TCP_TTL 255
#define TCP_QUEUE_OOSEQ 0
#define TCP_MSS (1500 - 40)
#define TCP_SND_BUF (2*TCP_MSS)
#define TCP_WND (2*TCP_MSS)
Simon
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