RB750 firmware 6.18

The MLPPP seems to work however we have only 2 symmetric lines, when bonding if you go to the status it shows that the active links 4, 5, 6 any number.
What is the reason for this or does anyone else see this behavior?

Thanks,

That is a very old problem that can be traced back until when MLPPP was first implemented (back in ROS 3.x).
Curiously, I have no idea what causes it, and it never got fixed over time. The main problem with that is, that this causes very bad performance (I once had 27 parallel connections open on two physical lines, and the router was crawling along at 200kbit/s on 2x 30 Mbit lines).
The only way is to work around it, so schedule a script that checks the number of active links and disable/enable the pppoe-client if that number is higher than 2.

RB750 firmware 6.18

The MLPPP seems to work however we have only 2 symmetric lines, when bonding if you go to the status it shows that the active links 4, 5, 6 any number.
What is the reason for this or does anyone else see this behavior?

Thanks,

There are only two things you can do:
- Using two or more WAN ports and policy based load balancing
- MLPPP must be given by two instances!!!!!!!!!!!!!!!!!!!!!!!
The router like the RouterBoard and the ISP also, otherwise
it would not be able to work really like as expected!

Load balancing:
1 Mbit/s + 1 MBit/s = 1 MBit/s + 1 MBit/s
MLPPP:
1 Mbit/s + 1 MBit/s = 2 MBit/s

Really bonding WAN ports or WAN lines would not be running in another way as you can see above.