Channel bonding / load balancing with multiple 4G connections

[Eagle]

One more thing I noticed researching all this 4G stuff online (pretty bored ) . There was people using a thing called speedify to bond 2 or 3 different 4G carriers and getting faster download/upload throughput. Then there was some other hardware versions looked a bit like a router , either a "load balancing router" or some other thing im not sure what it was called.
Example of it on linus tech tip channel using wired connection though : https://youtu.be/tqbnjgbtDl0?t=23

[Seán]

Windows has load balancing support built in, so technically you could add a second network card to your PC and connect two Internet connections to it. With a few setting changes, Windows will share the load between the two network connections. This does have one major issue in that you will be connecting across two IP addresses. Some websites and services will falsely detect hijacked session cookies or unauthorised account sharing (e.g. subscription services), an issue I ran into when I tried something like this.

Speedify gets around this issue by making a VPN connection over both Internet connections to its server so that all your traffic goes out one IP address, just like a regular privacy VPN connection.

Before I cancelled my DSL line a few years ago, I have tried an Internet bonding service, but recall running into stability issues at the time. I can't remember which service I used, but Speedify does seem to ring a bell.

Unfortunately, channel bonding does require very similar, preferably identical connections to work. So technically it should work between Three 4G on band 3 and the second router either pointing at another Three band 3 mast or on another stable 4G Internet connection. This likely explains why it did not work for me between DSL and 4G.

As for trying to bond band 3 and 20 between two separate routers, I don't think this will work any better than 4G+ with a single router. The problem here is that band 20 is heavily congested. This means that packets sent over both connections will arrive out of sequence at the other end, causing significant jitter and latency spikes.

As for running both routers on band 3 pointing at the same mast, well... that's not going to work. Instead, they will be sharing the same airtime, so instead of let's say one getting 10Mbps, both instead will be sharing about 5Mbps each of that 10Mbps, which still adds up to 10Mbps, never mind the additional jitter of splitting and recombining packets across both connections.