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Date: Tue, 14 Nov 2000 16:39:28 -0800
From: Julian Elischer <julian@elischer.org>
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To: Alex Pilosov <alex@pilosoft.com>
Cc: freebsd-net@freebsd.org
Subject: Re: netgraph/atm
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Alex Pilosov wrote:
> 
> I'm beginning to look into implementing ATM rfc1483 bridging with freebsd.
> 
> Here's my plan:
> 
> 1. Add netgraph hooks to ATM HARP stack, in a similar way the LMI/DLCI
> hooks work for ethernet: ATM physical interfaces should appear as netgraph
> nodes.
> 
> I.E. you should be able to do something like this:
> ngctl mkpeer hfa0:rawdata rfc1483 pvc0/33 encaps_llc_snap
> to decapsulate snap+llc bridged packets from that PVC.
> 
> rfc1483 node would output 802.3 ethernet frames, extracted from that VC

yep.. If that's what rfc1483 (the rfc) treats as input and output.

> 
> 2. Create a 'virtual ethernet' node type, which should be similar to
> current 'iface' type, only it should present actual ethernet-style
> interface, i.e. with MAC addresses, ARP, etc.
> 
> Vitaly Belekhov's work should be very useful for me, since he implemented
> 'virtual ethernet' ng_eiface driver. Hopefully, I won't need to change
> anything, and can connect hfa0:rawdata:pvc0/33 directly to ng_eiface ;)

hopefully.

> 
> 3. Then I can use bridging provided by freebsd on these virtual ethernets.
> 
> Questions:
> 1) Does my scheme make sense?
yes, though I haven't checked everything...

> 
> 2) I'll have probably 50-100 virtual ethernet devices. Should I expect
> major problems with this?

no.
(but ifconfig and netstat will get long :-)

> 
> Also, I just wanted to say thanks to netgraph team...Its an awfully simple
> idea, treating network interfaces as just streams of packets, and using
> unixish semantics to connect them via filters/edges...

That's what we designed it for....


> 
> Thanks.
> 
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-- 
      __--_|\  Julian Elischer
     /       \ julian@elischer.org
    (   OZ    ) World tour 2000
---> X_.---._/  presently in:  Budapest
            v


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