Date: Fri, 19 Oct 2007 18:55:39 -0500 From: Mike Karels <karels@karels.net> To: Sten Daniel Soersdal <netslists@gmail.com> Cc: Len Gross <sandiegobiker@gmail.com>, freebsd-net@freebsd.org Subject: Re: Disable Exponential Backoff (retry) on Ethernet? Message-ID: <200710192355.l9JNtd3B069594@redrock.karels.net> In-Reply-To: Your message of Sat, 20 Oct 2007 00:34:58 %2B0200. <47193112.4030701@gmail.com>
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> Len Gross wrote: > > Thanks so much for the response. Here is some additional information. > > > > I'm trying to emulate an RF network where there are colisions (e.g. "Aloha" > > type protocol) so I actually need collisions! I had forgotten that modern > > hardware > > essentially eliminated them. So, lets say I can find/use an "old hub", > > can I control the number of retries? Maybe I have to find some old NICs and > > old drivers? > That would be very NIC specific. Retries are done in NIC hardware as far > as i know. The last NICs that I remember with control over retries were some of the original 3Com NICs. They supported only 10Base5, the original thick coax Ethernet (remember vampire taps?). They plugged into a Unibus on a VAX, or a PDP-11 I suppose. I think they were about $3000 each at the time. Mike
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