Date: Sun, 04 Mar 2001 20:34:10 +0100 From: "Julian Stacey" <jhs@jhs.muc.de> To: nino@inode.at Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Dead link problems (with crossover cable) Message-ID: <200103041934.f24JYAu08057@jhs.muc.de> In-Reply-To: Your message of "Fri, 02 Mar 2001 21:07:14 %2B0100." <20010302210714.A31469@TK147108.geizhals.at>
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Hi,
"Marinos J . Yannikos" wrote:
> I seem to have a non-reproducible but reoccurring problem:
>
> Host A: single CPU, Intel 443GX+ board with D-Link DFE-530TX ('vr')
> Runs FreeBSD 4.1.1-STABLE
> Has a Mylex ExtremeRAID 1100, no other PCI cards.
>
> Host B: SMP system, dual Intel 82557 on-board ethernet
> SuSE Linux 7.0
>
> They are connected with a crossover cable, both ends set to 100mbps
> full-duplex.
Mode Byte maybe ?
I had back-to-back direct wired FBSD-3.4 systems (with 3com cards) last
summer that sometimes started in the wrong mode, (admittedly, not in mid
use like you). I guessed mine was a 10/100 thing, & by asserting the media
byte (man xl to see one example of a `media' byte, but better see manual
for your card), the problem went away.
Presumably either end forces a bandwidth re-evaluation at least at
every reboot/reset if not more often, so it's probably worth forcing
the media asertion byte if available, rather than trusting to any
auto-negotiation of 10/100/full/half etc.
I recall for top speed, all 8 wires need to exist, but for
slower modes less wires will do ? If you want to investigate what
different 100M modes either end might be attempting, here's clues
from my notes in:
http://bim.bsn.com/~jhs/standards/rs232.v24
Halsall Book:
100Base4T=UTP=Unshielded Twisted pair Cat3 33.3Mbps/pair
100BaseX= STP= Shielded Twisted pair Cat5
http://margo.student.utwente.nl/stefan/hwb/hwb.html
http://www.obbit.se/~mike/wordlist.htm#patchcord
It's been a while since I looked at 100 modes, & I've got a cold,
so no more energy to check things, but hope some of the above might help,
Good Luck.
Julian
-
Julian Stacey Unix Consultant - Munich Germany http://bim.bsn.com/~jhs/
Considering Linux ? Try FreeBSD with 4500 packages !
Ihr Rauchen => mein allergischer Kopfschmerz ! Kau/Schnupftabak probieren !
Vintage Computer Fest Europa 28&9 Apr 2001 http://www.vintage.org/vcfe
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