IT, Digital & Culture
This is much simpler in OPNSense
System -> Gateways -> All
Change Interface to WAN.
Add your primary OVH IP gateway in the “Gateway” field (this will almost certainly not be the gateway for your IP address block) and tick the “far gateway” box.
Hit save and then reload
Adding more IPs
Go to the firewall -> virtual IPs
Add an IP Alias, add the IPs one at a time with a /32
Your IPs are now ready to use!
Firewall -> NAT -> Outbound
Manual Outbound NAT rule generation. If it isn’t created automatically add a rule with the Interface of WAN, source of your internal IP (192.168.1.x/24) & any VPN IP leave everything else as default and save. Check that your WAN address is chosen rather than interface address (or your outgoing traffic will come from any of your external IPs)