Mother's localhost admin presents.
This is set of crutches for automatically controlling two or more ISPs on multihomed debian-based server. (The original system - devuan ascii.)
- Loads nftables on start first of lan-interfaces.
- On dhcp renew/bound (re)creates route table for each wan-interface.
- Creates and updates list of ip-addresses for ping.
- Pings periodically (cron) or on dhcp event and makes a list of available wan-interfaces.
- Sets default route to first available wan-interface.
- Makes disgusting beeps when switching routes and even more disgusting beeps when inet is not available.
Scripts are written in bash, require iproute2, nftables and dhclient.
Copyleft by dimbor i@dimbor.ru 2020 based on https://habr.com/ru/post/199478/