Re: Internet connection redundancy (DSL and 4GLTE)

[RVP <rvp%SDF.ORG@localhost>]

On Wed, 8 Jun 2022, BERTRAND Joël wrote:

> For example, how can I ping a server on WAN side through
> 192.168.15.19 gateway and with 192.168.15.20 default route ?

Don't need to do that: just ping the host and if ping fails,
switch routes round-robin; something like this:

```
#!/bin/sh

PRI=192.168.15.19
SEC=192.168.15.20
R=$PRI
H=8.8.8.8
T=10

while :
do	if ! ping -nc1 $H >/dev/null 2>&1
	then	case $R in
		$PRI)	R=$SEC	;;
		$SEC)	R=$PRI	;;
		esac
		route add default gw $R
		echo switched to $R
		S=1
	else	S=$T
	fi
	sleep $S
done
```

-RVP