[RndTbl] aggregating dsl lines

Adam Thompson athompso at athompso.net
Tue Sep 29 10:48:10 CDT 2015

The unit I suggested someone else try was this: 
Which can be purchased in north america via (among others) Amazon.ca: 
http://www.amazon.ca/PLANET-VC-231-Ethernet-VDSL2-Converter/dp/B009WWHNWU for 
only $142.83 ea.
You need two; one for each end.  No DSLAM required.
This unit only does VDSL2+ profile 30a on a single telco cable at a 
time, and may or may not be able to support profile 30a at all.  If 30a 
works for you, though, that's 100Mbps symmetric.

There's also BlackBox gear that's similar - the LinkGain extender 
and the entire Ethernet-over-UTP series (up to 100Mbps, 

Of course, you can combine two pairs of VC-231s with two linux boxes 
acting as bridges, each one configured for round-robin, and get an 
aggregate 200Mbps symmetric out of the cabling.

Good luck!


On 15-09-29 08:09 AM, Adam Thompson wrote:
> This is an active area of research, particularly with the advent of 
> multi-path TCP.
> Presently, however, you have to hide the two-link-ness from the TCP 
> layer, and essentially from the IP layer as well.
> ECMP would work, as long as both lines are the same (this does not 
> hold true as a dynamic assertion with DSL technology, *ever*).
> LACP will *not* work.
> If you have Linux boxes at both ends, you can use mod_bonding in its 
> round-robin mode... I've done that in the past and it does work.
> Far more effective, however, would be to upgrade to a symmetric VDSL2 
> setup that supports DSL bonded pairs.
> That'll set you back around $600+ per end, IIRC, replaces both the 
> DSLAM and the DSLR, but makes your problems go away by turning all the 
> copper into a single Ethernet link.
> I just worked with someone else on this kind of setup, I'll see if I 
> can find the links...
> -Adam
> On September 29, 2015 4:18:54 AM CDT, Trevor Cordes 
> <trevor at tecnopolis.ca> wrote:
>     Is it possible to aggregate DSL lines, to combine them to get X-times the
>     bandwidth on a single link?  In this situation, I control both ends, the
>     DSLAM and the DSL modem side on the other end of some POTS runs (CAT3-ish
>     I assume, or worse).
>     Note, I don't want load balancing or fancy routing/sharing.  I need double
>     (or more) the bandwidth for a single application (single TCP connection).
>     If required, we can have linux/bsd boxes we control at either end of the
>     links.
>     If it's not possible, does anyone have any other ideas for somehow getting
>     better bandwidth out of 500m POTS wires (quantity 4)?
>     Thanks!
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