2 IP addresses on external interface?
I have a Watchguard XTM with a configured external interface which works just fine. My ISP has assigned an additional /30 IP address to us which is on a completely different subnet to our /29 on the external interface.
I thought it would be a simple case to just add the additional address as a secondary address on the external interface however it wont let me add it giving the error: x.x.x.x/30 is not a valid secondary IP address.
I can see in traffic monitor that the ISP has routed the additional address to our primary address as I can see the traffic coming in but being blocked.
How do I get this to work so that I can setup rules for this new IP address for incoming traffic?