[AusNOG] MLPPP experiences

Joseph Goldman joe at apcs.com.au
Wed Mar 27 09:31:25 EST 2013

Hi Tony,

  We are using HTTP streams to test at this stage. I will have a look at 
UDP streams later to see if I can get more specific results. I'd say 
more than likely it is asking for a retransmit.

  I am 99% sure that the difference in link quality will be the cause in 
this particular situation, and we are making arrangements for a second 
Telstra supplied DSL line to the same premises (so presumably same cable 
path and little difference in quality) to test further with, I simply 
wanted to get the opinion of those who have had success in MLPPP and 
whether or not our deductions are correct or if there are any other 
tricks or tips to a successful MLPPP connection.

  Thanks for your response!


On 27/03/13 9:25 AM, Tony wrote:
> Hi Joe,
> I would start by using iperf in UDP mode to see just how many out of 
> order packets you are getting (probably half by the sound of it).
> Can the OS/application you are testing with re-order packets, or will 
> it simply ditch anything that is out of sequence and ask for a 
> re-transmit ?
> Personally I am not suprised with the result although I have no first 
> hand experience with MLPPP over links that are so disparate.
> regards,
> Tony.
>     ------------------------------------------------------------------------
>     *From:* Joseph Goldman <joe at apcs.com.au>
>     *To:* ausnog at lists.ausnog.net
>     *Sent:* Wednesday, 27 March 2013 7:54 AM
>     *Subject:* [AusNOG] MLPPP experiences
>     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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