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<div class="moz-cite-prefix">Hi Tony,<br>
<br>
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.<br>
<br>
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.<br>
<br>
Thanks for your response!<br>
<br>
Joe<br>
<br>
On 27/03/13 9:25 AM, Tony wrote:<br>
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<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">Hi Joe,<br>
<br>
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).<br>
<br>
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 ?<br>
<br>
Personally I am not suprised with the result although I have no
first hand experience with MLPPP over links that are so
disparate.<br>
<br>
<br>
regards,<br>
Tony.<br>
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<hr size="1"> <b><span style="font-weight:bold;">From:</span></b>
Joseph Goldman <a class="moz-txt-link-rfc2396E" href="mailto:joe@apcs.com.au"><joe@apcs.com.au></a><br>
<b><span style="font-weight: bold;">To:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:ausnog@lists.ausnog.net">ausnog@lists.ausnog.net</a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Wednesday, 27 March 2013 7:54 AM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
[AusNOG] MLPPP experiences<br>
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<br>
Hi list,<br>
<br>
Recently found the need to start experimenting with
MLPPP for some upcoming deployments.<br>
<br>
Our LAC has been capable for some time we've just never
really had a need for it.<br>
<br>
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.<br>
<br>
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.<br>
<br>
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?<br>
<br>
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).<br>
<br>
Thanks,<br>
Joe<br>
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<br>
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