Re: [lwip-users] how to detect cable down in this case

[vincent cui]

You mean that I have to send keep-alive packet to switch and hub to get 
response ? if no response, it should be break up ?

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Krzysztof Weso?owski
Sent: 2012年8月22日 4:44
To: Mailing list for lwIP users
Subject: Re: [lwip-users] how to detect cable down in this case

On Tue, Aug 21, 2012 at 10:38 PM, Bill Auerbach
<address@hidden> wrote:
> I think he means if you are connected to a switch and the connection to
> another device on the switch is removed.  In this case there is no loss of
> link since the switch maintains that but there is a loss of connection.

Now I see, i have to often used config when other end was other end of
physical cable ;)

There where sevaral topics about detecting connection break, with
techniques like Keep-Alive Packets mentioned.

TCP/IP itself is capable of delivering packets in connection even when
physical link was down between them, sothere is no simple/ultimate
"other plug out" on this layer.

Regards,
Krzysztof Wesołowski

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