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FreeBSD Security Archives: Re: Lisen only NIC

Re: Lisen only NIC

Thu, 09 Sep 1999 21:32:40 +0200

> 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.

It's possible to "cheat" on this with some active electronics. Anzen
makes a "receive only" cable, see


Disclaimer: I have no particular knowledge of the Anzen product, aside
from having seen a discussion about this on the NFR distribution list.

Steinar Haug, Nethelp consulting, sthaugnethelp.no

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This archive was generated by hypermail 2.0b3 on Thu Sep 09 1999 - 14:32:27 CDT