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

[vincent cui]

Ok, let me check :)  

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Krzysztof Weso?owski
Sent: 2012年8月22日 5:23
To: Mailing list for lwIP users
Subject: Re: [lwip-users] how to detect cable down in this case

So, assuming that cable is only "passive copper physical medium:)"
there is no difference which side of cable is unplugged - PHY device
will report link down.

Regards,
Krzysztof Wesołowski,



On Tue, Aug 21, 2012 at 11:12 PM, vincent cui <address@hidden> wrote:
> Actually, I always plug in cable another side in wall, I think it is 
> connected into some switch or hub ..
> But anyway , I really don't know what type the customer use.
>
>
>
> -----Original Message-----
> From: address@hidden [mailto:address@hidden On Behalf Of Krzysztof Weso?owski
> Sent: 2012年8月22日 5:12
> To: Mailing list for lwIP users
> Subject: Re: [lwip-users] how to detect cable down in this case
>
> 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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