Re: [LARTC] Interleave cells with IP over ATM?

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Ed W wrote:
> Anyone know if it's possible to interleave two IP packets when using 
> PPPoA and VC based lines?  Can it be done with any PPPoE implementations?

I think pppoa/e is irrelavent it has to be done at ATM level which means 
you need a different VPI/VCI on the cells to distinguish them.

In the UK if BT/Some LLU teleco would let me have two different VPI/VCI 
s then I could probably do it. My PCI modems' drivers have code to 
interleave/priorotise at cell level.

> 
> The goal is to reduce the delay when you have a high priority packet 
> waiting, but a lower priority (large) packet already started going out 
> ahead of this packet.  I don't want the overhead of much smaller MTU, 
> which is the other way to workaround it...

Having the code to hack I did wonder whether as a kludge it would work 
if transmitting a long train of cells belonging to the same aal5 frame 
was just aborted to be retransmitted later when a shorter frame 
arrived... as long as the other end didn't count all the trashed frames 
and use it to disconnect/try to resync.

Are you really using something that makes +45ms too much or just wanting 
to tweak?

Andy.
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