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Date:      Wed, 1 Mar 2000 04:27:46 +1300
From:      Joe Abley <jabley@patho.gen.nz>
To:        Eddie - EAZNet Internet Services <eddie@eaznet.com>
Cc:        FreeBSD ISP Mailing List <freebsd-isp@FreeBSD.ORG>
Subject:   Re: ATM DS3
Message-ID:  <20000301042744.B24877@patho.gen.nz>
In-Reply-To: <38BABA13.2CFAA57A@eaznet.com>; from eddie@eaznet.com on Mon, Feb 28, 2000 at 11:10:27AM -0700
References:  <38BABA13.2CFAA57A@eaznet.com>

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On Mon, Feb 28, 2000 at 11:10:27AM -0700, Eddie - EAZNet Internet Services wrote:
> Is there a way to use a FreeBSD box to handle a 6MB DS3 over ATM?  It
> wouldn't even have to do routing or anything.  Just be able to break out
> the channel and feed it into a routers HSSI port.

The packets that arrive over your ATM PVC will be (probably) AAL5-framed,
possibly with a SNAP header. You're unlikely to use this encapsulation
over your HSSI interface (you're probably using cisco hdlc or ppp).

So, unless you're planning some funky excursion into cells-in-frames,
you're going to have to re-encapsulate -- which means you probably want
to route.

There is ATM support in FreeBSD, and I presume it handles PVCs if it
does anything. Your questions really are, I think:

 + does anybody sell a DS3 ATM adapter which is supported by FreeBSD?

 + does anybody sell a HSSI adapter which is supported by FreeBSD?

 + will FreeBSD support (insert encaps here) over ATM encapsulation?

 + will FreeBSD support (insert encaps here) over HSSI encapsulation?

> Any ideas? suggestions?  I don't like the idea of spending $20k+ for a
> Cisco 7200 to do this...

I take it those are US$. Cisco ATM port adapters seem hideously expensive.
Just another good reason to avoid ATM, I suppose :)

Joe


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