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 <vincent....@enlogic.com> 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: lwip-users-bounces+vincent.cui=enlogic....@nongnu.org > [mailto:lwip-users-bounces+vincent.cui=enlogic....@nongnu.org] 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 <vincent....@enlogic.com> 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: lwip-users-bounces+vincent.cui=enlogic....@nongnu.org >> [mailto:lwip-users-bounces+vincent.cui=enlogic....@nongnu.org] 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 >> <bauerb...@arrayonline.com> 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 >> >> _______________________________________________ >> lwip-users mailing list >> lwip-users@nongnu.org >> https://lists.nongnu.org/mailman/listinfo/lwip-users >> _______________________________________________ >> lwip-users mailing list >> lwip-users@nongnu.org >> https://lists.nongnu.org/mailman/listinfo/lwip-users > > _______________________________________________ > lwip-users mailing list > lwip-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/lwip-users > _______________________________________________ > lwip-users mailing list > lwip-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/lwip-users _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
