Technology · EdgeFusion
Bonding makes your connections work as one. EdgeFusion decides which ones. It checks every connection every second, groups them into bonds with priorities, and moves your traffic to the next bond when one starts to struggle, then moves it back once it is truly well again.
Once a second, Box sends a small probe down each tunnel and times the reply from the hub. From those replies it keeps three numbers for every connection. Box times the round trip on its own clock, so the numbers stay honest even if the two ends disagree about the time.
How long a probe takes to get to the hub and back, smoothed so one slow reply doesn't count for too much.
Too slow above 300 msHow much that delay jumps around. Steady delay is fine for calls; jumpy delay is what makes voices stutter.
Too jumpy above 80 msHow many of the last 60 probes never came back. A connection that loses packets slows everything bonded with it.
Too lossy above 5%These are the starting limits. You can change them for your Box.
Three ways to run
Every working connection is in one bond and carries traffic all the time. The simplest setup, and the most speed.
Put your connections into bonds and rank them. Use your fibre on its own, say, and keep two SIMs bonded behind it as the backup.
Box groups its connections by how they are actually behaving, and ranks the groups by speed of response. It keeps adjusting as conditions change.
If the bond carrying your traffic goes down, EdgeFusion moves to the next one straight away. If it is still up but struggling, it waits for three bad checks in a row, about three seconds, so a single slow reply never sends you elsewhere.
Coming back is slower on purpose. A preferred bond has to stay healthy for a full minute before traffic returns to it, so a connection that keeps dropping in and out can't bounce you back and forth. While a switch is under way, traffic uses any connection that's up rather than waiting.
After a couple of minutes of measuring, and then every five minutes, Box groups connections that respond at a similar speed, ranks the groups fastest first, and moves any connection losing too many packets into a group of its own at the back.
It only changes the grouping when it comes to the same answer twice in a row, and never straight after a switch, so your setup doesn't churn.
Pick a mode, choose which connections go in each bond, and set how strict the health limits are and how long to wait before switching back. Or leave it all alone: Box bonds everything from the moment it's switched on.