Re: [lwip-users] Not responding to TCP keep-alives

[Craig Graham]

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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