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Re: [lwip-users] Not responding to TCP keep-alives
From: |
Craig Graham |
Subject: |
Re: [lwip-users] Not responding to TCP keep-alives |
Date: |
Mon, 16 Aug 2004 18:28:09 +0100 |
User-agent: |
KMail/1.6 |
The LCP_ECHOINTERVAL option relates to detecting lost PPP links.
If it's non-zero then the LWIP PPP code sends LCP echo packets every
LCP_ECHOINTERVAL seconds - if LCP_MAXECHOFAILS packets fail to get an echo
from the PPP server, then lwip assumes the PPP link is dead and drops the
connection (signalling this with a callback) - very useful for modem links,
and it's probably a mistake for it to be turned off by default in the opt.h
file....
But I doubt it relates to the problem David is seeing.....
Craig.
On Monday 16 August 2004 17:31, Tom C. Barker wrote:
> David,
>
> The only suggestions I could make would be to turn on TCP_DEBUG,
> TCP_RST_DEBUG, and SOCKETS_DEBUG to see if anything comes up.
>
> Also, it looks like the only other options (opt.h has LCP_ECHOINTERVAL)
> seem to apply to a server keepalive.
>
> Tom
>
>
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden Behalf
> Of David Haas
> Sent: Monday, August 16, 2004 9:06 AM
> To: Mailing list for lwIP users
> Subject: [lwip-users] Not responding to TCP keep-alives
>
>
> Hi all,
>
> I am having trouble with LWIP not responding to TCP keep alives. Here
> are some frames captured by ethereal and you will see that LWIP
> (192.168.10.242) stops responding to the keep-alive requests from
> Windows 2000 (192.168.10.252). Does anyone have any incite how to fix
> this?
>
> No. Time Source Destination Protocol
> Info
> 74 3.427283 192.168.10.242 192.168.10.252 TCP
> 1101 > 1266 [ACK] Seq=1 Ack=48755 Win=404 Len=0
> 75 8.399604 192.168.10.252 192.168.10.242 TCP
> 1266 > 1101 [ACK] Seq=48755 Ack=1 Win=17520 Len=404
> 76 8.664309 192.168.10.242 192.168.10.252 TCP
> [TCP ZeroWindow] 1101 > 1266 [ACK] Seq=1 Ack=49159 Win=0 Len=0
> 77 9.100314 192.168.10.252 192.168.10.242 TCP
> 1266 > 1101 [ACK] Seq=49159 Ack=1 Win=17520 Len=1
> 78 10.101838 192.168.10.252 192.168.10.242 TCP
> [TCP Keep-Alive] 1266 > 1101 [ACK] Seq=49159 Ack=1 Win=17520 Len=1
> 80 12.104858 192.168.10.252 192.168.10.242 TCP
> [TCP Keep-Alive] 1266 > 1101 [ACK] Seq=49159 Ack=1 Win=17520 Len=1
> 81 16.110865 192.168.10.252 192.168.10.242 TCP
> [TCP Keep-Alive] 1266 > 1101 [ACK] Seq=49159 Ack=1 Win=17520 Len=1
>
>
>
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