Date: Wed, 17 Oct 2001 19:51:36 -0500 From: David Kelly <dkelly@grumpy.dyndns.org> To: Raymon Gentry <rgentry@aecc.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: FreeBSD success and ponderings??? Message-ID: <200110180051.f9I0paw85706@grumpy.dyndns.org> In-Reply-To: Message from Raymon Gentry <rgentry@aecc.com> of "Tue, 16 Oct 2001 08:41:43 CDT." <13909109FC93D111853100A0C99AF44C048194C9@GUMBY>
next in thread | previous in thread | raw e-mail | index | archive | help
Raymon Gentry writes: > > Now my question - Why would the windows box see the "weakened" packets but > my BSD box would not? - anybody? Different ethernet cards. Different cables. Different port on the hub. Apparently the Windows boxes didn't reliably see the weakened packets else you wouldn't have been there. I've noticed a genuine 3Com card has probably the best UTP media interface of anything you can buy. Works where others fail. So for testing you don't want to use 3Com. For example, a couple of years ago my employer bought a pile of Dell Optiplex machines with built-in 3C905 compatible NICs. Used the "cat5" ethernet cables which came with the machines. Several months later one starts acting up bad enough the user complained. Threw my hands up in the air and tried a different cable and all was peachy once again. Checked the cable Dell provided and found while it was wired correct for DC the twisted pairs were not all twisted. The 3/6 pair were on adjacent pins rather than split around 4/5. Checked and found all the Dell cables were that way. The 3Com NIC was making it work anyhow. Have seen the same thing with Sun S-bus 3Com NIC's. And built-in Dell 3Com NIC's. More recently I was building FreeBSD firewalls with one 3C905 and one Etherexpress Pro 10/100 in each machine. Checking things out the 3C905 was working but the Intel card was not. Then tried that cable on the other machines and found it reliably worked on 3Com but not Intel. One pair had its polarity inverted in the cable. Apparently 3Com was not polarity sensitive while Intel was. -- David Kelly N4HHE, dkelly@hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200110180051.f9I0paw85706>