I have a stupid situation. My network has direct slow internet access that can be used at any time. However, I have a subscription for fast but limited vpn that works like a sock5 server (not sure if it's transparent or not).
My question is: is it possible to configure iptables to redirect all TCP traffic to the sock5 server only if the server is working and using the slow connection otherwise?
So something special:
- Linux Ubuntu 18.04 as a router
- eth0 – the external interphase, ip-dynamic, got
through the DHCP protocol
- vpn – ip is the same as the gateway of the
external network with port 1986
- eth1 – the inner network that can be
configured as I want.