Subject: Re: trouble with 10baseT autoselect on wm0
To: Tom Ivar Helbekkmo <email@example.com>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 04/27/2005 22:22:46
In message <email@example.com>, Tom Ivar Helbekkmo writes:
>"Steven M. Bellovin" <firstname.lastname@example.org> writes:
>> I have a Thinkpad T42 with a wm GigE card. I've never tried it at
>> GigE speeds; it runs fine at 100 Mbps. But it doesn't work at 10
>> Mbps if I have it set to 'media autoselect'. However, if I set it
>> to 'media 10baseT', it works.
>I have one of those laptops as well. I haven't tried it at 10 Mbps,
>but I had to quit letting it autoselect against our Cisco GigE capable
>switch, because it would negotiate 1 Gbps and full duplex -- after
>trying for about two minutes. Every time something happened to the
>interface, such as me putting it into promiscuous mode with tcpdump,
>there would be another two minute wait for the autoselect.
Hmm -- I haven't tried waiting two minutes... But I've seen a number
of postings that suggest that disabling autonegotiation is a bad idea,
because some devices can't work any other way.
--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb