Date: Sat, 11 Jan 1997 21:20:01 -0800 From: David Greenman <dg@root.com> To: "Adam W. Hawks" <root@pent.vnet.net> Cc: questions@freebsd.org Subject: Re: How do I set 100MB mode on fxp0 Message-ID: <199701120520.VAA23974@root.com> In-Reply-To: Your message of "Sat, 11 Jan 1997 23:59:16 EST." <199701120459.XAA25489@pent.vnet.net>
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>> >I have a Intel EtherExpress Pro 100b card and can't get it do >> >talk at any speed but 10MB. What do I have to do to get it in >> >100MB mode. >> > > (snip) >> >> Do you have a 100Mbit switch? You can't do both modes without a switch. > >no. There is no jumpers or switches on the card. :-) Uh, that's not what I meant. An ethernet switch is a special device that does packet-level switching and has significant performance advantages over a non-switching ethernet hub. It also allows for ethernet bridging, and as a side-effect, can simultaneously support both 10Mbit and 100Mbit ethernet. >> If you have the machine connected by a cross-over cable, be warned that the >> Pro/100B's auto speed detection doesn't deal with this correctly when the >> cards on both ends are Pro/100B's. It does seem to work when one card is >> a DEC chip based card, however. > >Both ends are Pro/100B's. Does that mean I will not be able to get it to >work in 100MB mode? Are they connected by a cross-over cable or a hub? If they are connected by a cross-over cable, then the answer is no, you'll need to at least get a 100Mbit hub. I complained to Intel about this deficiency a long time ago and was told that "cross-over cables aren't supported". >Also does the Berkley Packet filter's make it default to 10MB. The file >if_fxp.c makes it look like it does? BPF has nothing to do with the interface speed. I think you're probably refering to the device class, which is DLT_EN10MB and serves double-duty for both 10 and 100Mbit ethernet. In any case, this is only used to identify the link-layer encapsulation type for BPF. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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