Date: Thu, 9 Sep 1999 12:53:26 -0700 (PDT) From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> To: sthaug@nethelp.no Cc: imp@village.org, jwyatt@rwsystems.net, Goran.Lowkrantz@infologigruppen.se, freebsd-security@FreeBSD.ORG Subject: Re: Lisen only NIC Message-ID: <199909091953.MAA18901@gndrsh.dnsmgr.net> In-Reply-To: <13779.936905560@verdi.nethelp.no> from "sthaug@nethelp.no" at "Sep 9, 1999 09:32:40 pm"
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> > I've seen in other discussions that while you could do this with the > > AUI based ethernet cards, you can't do this with 10base2 or 10base-t > > cards. Thinnet is obvious... But the 10-base-t/100-base-t cards need > > the xmit lines to negotiate speed settings with the hub. Can anybody > > confirm this? > > Not just for the negotiation, but also to keep the link up. There are > link pulses sent at regular intervals. If these are not received, the > link is detected as being down. Can you confirm for me that the link pulses are actually a function of the MAU/MII and not the NIC chip. I don't recall seeing anything in any NIC chip data sheet that talks about these. I don't have any current MAU/MII data sheets. > > It's possible to "cheat" on this with some active electronics. Anzen > makes a "receive only" cable, see > > http://www.anzen.com/afj/afj_faq.html#anchor157338 Back to back MAU's with the XMIT pair left out perhaps??? -- Rod Grimes - KD7CAX - (RWG25) rgrimes@gndrsh.dnsmgr.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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