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Who will tell you a ready-made solution for MultiWAN in GNU / Linux distributions?
Actually everything in the title
For OpenWRT, there is mwan3, which perfectly allows you to have several channels in filer mode and automatically switch when one of them crashes. Unfortunately mwan3 is tightly nailed to OpenWRT and cannot be transferred to Debain/Ubuntu.
The goal is simple: we have two channels, one by wire / wifi - the main one, the second - an LTE modem as a spare. If the main one falls, we switch to the backup, if the main one returns, we return to it.
It is clear that I can write a script myself that will ping the conditional 1.1.1.1 once a minute and switch the gate, but suddenly there are already ready-made solutions with a simple config and you don’t need to sculpt anything yourself.
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NetGWM
NetGWM (Network Gateway Manager) is a utility for automatically switching network gateways when the Internet is unavailable in
the GNU/Linux operating system. NetGWM makes it easy to create fault-tolerant WAN connections.
https://github.com/flant/netgwm
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