Date: Sun, 12 Jan 1997 11:26:01 -0500 From: "Adam W. Hawks" <root@pent.vnet.net> To: dg@root.com Cc: questions@freebsd.org Subject: Re: How do I set 100MB mode on fxp0 Message-ID: <199701121626.LAA27279@pent.vnet.net> In-Reply-To: Your message of "Sat, 11 Jan 1997 21:20:01 PST." <199701120520.VAA23974@root.com>
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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. > I don't have a lot of experience with lan's but that does make sense now what you said. And NO I don't have one of those. > >> If you have the machine connected by a cross-over cable, be warned that th e > >> 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 b y > 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". Yes I'm using a cross-over cable. That explains why I havn't been getting the speed I'm looking for. I just remember reading in the manual that the cross-over cable between two cards was OK without a hub. But I just went to the readme on the disk and it does say it should only be used for test pourposes. > > >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 > Thanks for all the help you've given me. It clears up quite a few questions I had. I guess I will be looking for a 100MB hub now. l8r Adam W. Hawks awhawks@ibm.net
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