Date: Mon, 26 Jul 1999 21:34:20 -0700 (PDT) From: Richard Hodges <rh@source.net> To: Mike Tancsa <mike@sentex.net> Cc: atm@FreeBSD.ORG Subject: Re: NIC questions Message-ID: <Pine.BSF.3.96.990726211857.11326E-100000@nexus6.source.net> In-Reply-To: <4.1.19990726222130.03ca7500@granite.sentex.ca>
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On Mon, 26 Jul 1999, Mike Tancsa wrote: > Hello, > We will soon be bringing up an ATM connection into a MAN and would like to > use our FreeBSD 3.x to terminate our connection. We will want to map out > multiple PVCs with a total cell rate of ~45Mbps. We would like to provide > traffic shaping as well on the various connections. I had a look through > the archives, and people seem to be happy with the Adeptec cards. You currently have a choice of the "en" driver or the HARP system, both of which use "routed" PDU encapsulation. Many, many commercial products want "bridged" encapsulation, so be sure to ask what your other end will be using. Also ask if they will use SNAP/LLC headers (they probably will). The "en" driver works great with Adaptec and Efficient 155mb cards. HARP works with Efficient or Fore PCA200E (not "LE") cards. In principle (!) HARP could be persuaded to work with the Adaptec cards. According to Chuck Cranor, his "en" driver is much more robust if you are using Efficient. Although I am no kernel guru, I have become somewhat familiar with his code, and I think I would agree with him. > Will I run into compatibility issues mapping out PVCs to other ends when > the other end is not a FreeBSD box. I am just starting to investigate the > ATM world, and I dont know what sort of inter operability issues I will run > into (if any) Beware of the difference between routed and bridged PDU encapsulation. By the way, most people will probably be talking about RFC1483 encapsulation, but PPP over ATM seems to be gathering popularity. I do not know of any current FreeBSD implementation of PPP/ATM :-( > Is ALTQ the QOS method of choice for this situation ? Good question. Hopefully someone better informed than I will answer. > I have so far read through the archives as far back as a year, and am not > sure what has changed since then. i.e. whether to go with BSDATM vs. HARP ? For PVC support, I would probably consider Chuck's "en" driver over HARP. > Where can I find more information, such as if single mode fiber comes into > the building, but the interface is multimode (in this case the ENI), what > can I do to make it compatible. ? Digi has a media adapter, I think it costs more than a thousand, though. You could get a Fore OC3 SM card, but that will cost even more. Argh. An ATM switch with SM would be yet more expensive. Sorry, no good ideas. All the best, -Richard ------------------------------------------------------------- Richard Hodges | Any sufficiently large group of people SourceNet / Alpine | is indistinguishable from idiots. rh@source.net | - OR - finger for pgp key | "Masses are asses." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-atm" in the body of the message
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