[AusNOG] ADSL2+ Aggregation at LNS without MLPPP HOWTO

[Ben Cooper]

But what if we really need the upload bandwidth? (ie id take the downstream
hit if it means my upstream is improved greatly.)

Backstory:

In my spare time, I stream myself playing games either casually or
competitively up to twitch. although latley None(read: 3) of my ADSL
connections have had the upstream to realiably stream.

I have been hunting for a way to join the 3 of them to try get the upload I
need to stream again, without any luck. I run PFsense as core routing, but
have some microtiks here i can toss in, if it means i can get better upload.

Else im going to have to get a microwave connection installed.

i am currently for the last week using 4G prepaid dongles and just dropping
$100 on the tesltra plan and then spending it all on datapack right away,
netting about 8-10 gb of data.

If anyone has any suggestions to try, I am all ears.

TLDR: I need more upload, badly.

On Fri, Sep 12, 2014 at 8:48 PM, Jarrad Mitchell <ausnog at outlook.com.au>
wrote:

> *I would expect that any form of 'single ip' ADSL Bonding is impractical
> for you.  If you must, you are best of to use Per-Destination Load
> Balancing with two separate ISPs, and perhaps route specific services
> through the better link. *
>
>
> *What follows is the technical reasoning and logical analysis that lead to
> the aforementioned conclusion*
>
>
> *Why 'Bonding / Teaming Aggregating' two ADSL etc links is usually a Very
> Bad Idea *
>
> ALL NETWORK INTERFACE (Including ADSL) 'Aggregation/Bonding/Teaming' that
> results in increased throughput across a single path (a connection between
> two computers/IPs eg your home pc to youtube.com) almost always results
> in a link that is at best just below TWICE the speed of the SLOWEST link.
>
> This is not always a problem.  For example, if you have two 100mbit fibre
> optic links over 1km, they are very unlikely to vary in their
> 'transmission' properties; that is to say, they are unlikely to vary
> considerably in how long it takes to ping the other end etc.  With a
> connection like this, where BOTH of the Aggregate / Team 'members' can be
> described as electrically/physically 'identical / significantly similar', a
> good quality, reliable increase in performance can be achieved.
>
>
> *Key Insight 1: Multiple Link Aggregates that increase Single Path
> Throughput ONLY EVER make sense when using IDENTICAL Aggregate Members.*
>
> Knowing this, we next need to consider why ADSL Technology was developed.
>  Simply put, it was designed to leverage EXISTING, VERY OLD Balanced
> Transmission Line to deliver 'high speed' internet access.  And it does a
> wonderful job indeed.  But just what exactly is this existing
> infrastructure?  The PTSN is/has in most cases (if not all):
>
> - Based on old *two pair non twisted transmission line* that was never
> designed for data.
> - Had previous network modifications (been connected and disconnected,
> redesigned etc)
> - Been previously upgraded (Pulse to DTMF Dialing for example)
> - Been previously re-purposed (ISDN)
> - Been expanded well beyond its original design, inconsistantly (Loading
> Coils, Pair Gain Systems & RIMS).
>
>
> *Key Insight 2: Any Two Pairs between an Exchange and the Customer are
> VERY UNLIKELY to be 'identical / significantly similar'.*
>
> Some people might wish to point out that EFM / SHDSL & Similar use exactly
> the above to deliver a good service.  And they're right, from a delivered
> service (Marketing?) perspective.  *Remember how I pointed out that a
> Aggregate will run at the speed of its slowest member?  EFM & SHDSL simply
> takes a bunch of pairs, and deliberately uses less bandwidth on all of them
> them than even the poorest can handle, then combines them. *
>
> I have personally seen 8 PAIRS (16 wires) used to deliver 10mbit / 10mbit
> EFM!  To put this into perspective, a single near ideal pair can deliver
> 20mbit Simplex (one way) over 1Km using only 2MHz of bandwidth.  VDSL2+
> over 500m, with its increased bandwidth would greatly exceed that!
>
> *Key Insight 3: YOU CAN make a bunch of DISSIMILAR (electrically) Links
> look Similar (logically) if you are prepared to make individual BANDWIDTH
> SACRIFICES.*
>
>
> *Conclusion*
> *And there in lies the reality.  At say $30 per pair, it doesn't make
> sense economically to Aggregate a 18000/900 Kbps pair with a 9000/850 Kbps
> pair.  Because to do so reliably, you're likely to end up with 17000 / 1600
> Kbps!!!!*
>
>
>
>
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>
>


-- 
--
Ben Cooper
CEO
Zeno Holdings PTY LTD
P: +61 7 3503 8553
M: 0410411301
E: ben at zeno.io
W: *http://zeno.io <http://zeno.io>*
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