[AusNOG] MLPPP experiences

Guy Ellis guy at traverse.com.au
Wed Mar 27 09:40:08 EST 2013

Hi Joseph,

We have a 'custom' OpenWRT build with ML-PPP and have tested it over a 
range of line speeds.
If you or anyone wants to see the results it I'm happy to share.

The only caveat that I'm aware of is that you can only achieve a maximum 
of 2x the minimum line speed.
So for example if you have a 1x 10Mbps and 1x 15Mbps the maximum you can 
expect is 2x 10Mbps less overhead.

Provided the resequencing buffer is large enough, there should be no 
issue with different latencies.
Since Microtik is closed source you may not be able to adjust this.

Kind regards,
  - Guy.

On 27/03/2013 8:54 AM, Joseph Goldman wrote:
> Hi list,
>  Recently found the need to start experimenting with MLPPP for some 
> upcoming deployments.
>  Our LAC has been capable for some time we've just never really had a 
> need for it.
>  In our office, we have a Telstra ADSL and an Optus ULL line. 
> Ultimately, there is a 10ms difference between them back to our LAC 
> (one's at ~30 the other at ~40). We achieved a MLPPP connection to our 
> LAC but what we found were less then stellar results. The 2 lines, by 
> themselves, sync and run at around 11mbit/800kbit, but when being used 
> in MLPPP we found we couldn't achieve above 10mbit.
>  Monitoring the interfaces we could see that it was successfully 
> sharing that 10mbit across both links equally, we just couldn't max 
> out the lot.
>  In your experiences, does the difference in latency that large cause 
> big problems (i.e. packets ultimately transmitting out of order and a 
> lot of corrections to be done) or are there other caveats of MLPPP i 
> should be aware of that could cause similar issues?
>  For reference sake, our test LAC is a Cisco 7206 and the test CPE is 
> a Mikrotik RouterOS device (using 2 ADSL Modems in bridge into an 
> ethernet port each).
> Thanks,
> Joe
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Guy Ellis
guy at traverse.com.au
T: +61 3 9386 4430 M: +61 419 398 234

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