Squid and MultiWAN

[framura]

Hi,

in my configuration I would like to use WebProxy (forward proxy) with a sort of multiwan configuration.

In my opnsense box, I configured VPN clients (3 openvpn clients) and a gateway group with these 3 openvpn connections: until now  I used this group (with some firewall rules) to force the use of vpn group for some LAN clients traffic and all works good.

Now I would like to add also a web proxy (squid) with the above vpn group: so I enabled and configured proxy (not transparent).

I know squid proxy uses, by default, only default gateway (WAN gateway) and in this mode all works good but I want to force to use only vpn group.

So I read many guides about this argument and I tried to use floating rules for http/https ports, I tried also to add "tcp_outgoing_address 127.0.0.1" in squid template but with no success: can you point me on right direction?

Thanks in advance