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FreeBSD Security Archives: Re: Lisen only NIC

Re: Lisen only NIC

Rodney W. Grimes (freebsdgndrsh.dnsmgr.net)
Thu, 9 Sep 1999 12:53:26 -0700 (PDT)

> > 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)                    rgrimesgndrsh.dnsmgr.net

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This archive was generated by hypermail 2.0b3 on Thu Sep 09 1999 - 14:56:11 CDT