Re: Internet connection redundancy (DSL and 4GLTE)

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

RVP a écrit :
> 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

	Your script runs, but SEC is only a backup and I have to switch back to
PRI as soon as possible (PRI has a fixed IP address).

	JKB