Subject: Re: Network vanishing...
To: Dan J Fraser <>
From: Manuel Bouyer <>
List: tech-net
Date: 06/12/1998 13:04:44
On Jun 11, Dan J Fraser wrote
> I've installed NetBSD 1.3.2 on a server at work, but have been having a few
> problems.
> The system has two NIC's, both Dec chipset.  One of them is connected to a
> cable modem, the other is connected to the internal LAN.
> Occationaly, it happens that two people on the cable modem segment end up
> using the same IP address.  When this happens, it seems that NetBSD somehow
> freaks out, and I can no longer talk though the cable modem until the
> machine is rebooted.  ifconfig down/up has no effect.  While the network is
> "dead", activity lights on the modem and network card are flashing,
> indicating that it is probably NetBSD's fault.
> Today, I temporarily unplugged the UTP cable between the cable modem and the
> NIC.  When they were re-connected, I had the same problem... no network
> connection though the cable modem.

The two problems are independant, the last one is a bug in the media autodetect
code of the de driver. An 'ifconfig down; ifconfig up' would have restarted
it again. To avoid this you can select explicitely a media (e.g
ifconfig media UTP).

Manuel Bouyer, LIP6, Universite Paris VI.