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Something interesting to add is that the excessive upstream bandwidth appears to be specific to the bonding (not the VPN) atleast to an extent. For example when I use iperf to go over a non bonded VPN (it goes faster due to one of my connections is closer to 45/35 than 35/35) but uses less upstream bandwidth during the transfer.
For example over the bond on a single link I see:
Incoming rates: 44692.3 kbits/sec
Outgoing rates: 2325.3 kbits/sec
And when I go over the bonded VPN I see:
Incoming rates: 36914.3 kbits/sec
Outgoing rates: 4422.9 kbits/sec
So its sending a lot more data (almost double) even though its downloading at a lower speed. How does the bonding work? Does it automatically send ACKs out of both interfaces or something?
Anywhere I can read up on the exact bonding method that ZS uses to bond the VPNs?