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

[Krzysztof Wesołowski]

Please, specify your topology (devices/switches/hubs/routers/etc,
which one is lwIP) and tell us what you mean by unpluging another side.

Keep Alives are sent between hosts, so L2/L3 devices are usually
transparen to them.

Regards,
Krzysztof Wesołowski,

On Tue, Aug 21, 2012 at 11:06 PM, vincent cui <address@hidden> wrote:
> 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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