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Re: [PLUG] full-duplex nic's
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Yep. The NIC should negotiate with the switch at the other end of its link
as to whether the two entities can support a full duplex connection. Things
that can stop a full duplex NIC from running at full speed are going to be
either unsupported port speed/mode settings at the hub/switch (ie. 100MbFDX
NIC connected to a 10MbHDX hub over correctly wired Cat5 or better ethernet
cable will have no chance of negotiating a full duplex 10Mbit connection) or
cable conditions (ie. incorrectly wired Cat5 cable, cable length exceeds 100
meters, poorly terminated cable, lame patch cord or mis-wired patch cord,
Cat3 cable wired correctly but trying to run 100Mbit, cable that has run
over florescent lights or in an electrical conduit).
Kam.
----- Original Message -----
From: "leroy" <leroy@leroybrown.com>
To: <plug@lists.phillylinux.org>
Sent: Friday, August 09, 2002 3:10 AM
Subject: [PLUG] full-duplex nic's
> my company has a production server with 3 broadcom 5701 cards in it, but
> only two are being used. for some reason, the two cards don't default to
> full duplex mode, so in /etc/modules.conf, i force them into full duplex
> mode (yes, the card does support full duplex and it is a recognized module
> parameter):
>
> alias eth0 bcm5700
> alias eth1 bcm5700
> alias eth2 bcm5700
> options bcm5700 full_duplex=1
>
> after a quick reboot (yes, i know i can do this without rebooting but i'm
> in new mexico and the box is in philly), eth2 is now in full duplex mode,
> but eth1 is still half duplex (from /var/log/messages):
>
> Aug 9 02:38:42 wsedb01 kernel: bcm5700: eth1 NIC Link is UP, 100 Mbps
> half duplex
> Aug 9 02:38:42 wsedb01 kernel: bcm5700: eth2 NIC Link is UP, 100 Mbps
> full duplex
>
> so is this something that is negotiated by the hub/router it's attached to
> or am i missing something in my attempt to force two nic's into full
> duplex mode? thanks
>
> stephen
>
> -- my name is not leroy
>
> _________________________________________________________________________
> Philadelphia Linux Users Group -- http://www.phillylinux.org
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_________________________________________________________________________
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.netisland.net/mailman/listinfo/plug-announce
General Discussion -- http://lists.netisland.net/mailman/listinfo/plug
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