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

[Tom C. Barker]

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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