This question has been asked before, I found some threads almost always asking the same question I have, but not really an answer.
We have 2 independent internet connections from our ISP, 1 fast primary connection and 1 slower DSL connection. Each connection obviously has it's own public IP-address. So far nothing special.
Our ISP also uses BGP to send us a /29 network. As long as the primary connection is up, the /29 is routed to that connection. If the connection drops the /29 is routed to the "backup" connection.
The /29 network is configured under Configure -> Routing -> BGP -> Networks and is correctly being advertised, however these addresses are not selectable in a DNAT rule.
I can add those addresses as an alias to the primary connection and they will be selectable in DNAT rules, but once this connection fails and BGP routes the addresses to the second internet connection connected to a different interface, then I suspect the aliases from the primary interface will not work anymore. On the UTM it was possible to configure the same aliases on the backup interface, but on XG it fails with an error message that the aliases have already been configured on a different interface.
Does anyone know how to correctly configure this so that the DNAT's keep working whenever one of the internet connections goes down (or comes back up)?
This thread was automatically locked due to age.
