Hi
I would like to bond 4 pptp (vpn) connections that terminate at a single cisco router.
My scenario is best explained with a diagram: 
Currently our users select which ADSL line they want the software to run on, but I would rather give them only one option and bond the 4 connections.
Most of the examples I found focus on bonding the PPPoE’s to the ISP, but I want to bond the PPtP to the PPtP server.
Can I use this solution? http://aacable.wordpress.com/2011/06/04/mikrotik-4-wan-load-balance-pcc-complete-script-by-zaib/#
How should I modify it to work for PPtP?
Note: Ths cisco router belongs to another provider and I do not have access to it.
If the solution requires it, I can add or remove RB’s from the network.