SonicWALL WAN FailOver Outbound NATs
Posted on 2011-02-23
We have a SonicWALL NSA240 firewall enhanced firmware and are attempting to setup FailOver on two internet WAN connections. Currently we already have the FailOver working to the point of automatically switching over the internet connections when the primary internet connection goes down, we also have already setup all of the NAT inbound rules, the firewall rules, and DNSMadeEasy.com for FailOver to switch over the DNS records as we have a mail server and a couple of websites internal.
The part that we are stuck at is how to make the outbound NAT rules fail over as well. Currently what happens if the internet goes down is that everything works properly except when for example the mail server responds it uses the original primary connections static internet address to send traffic outbound as the original NAT rule tells it to which I assume will drop the traffic as the primary internet static IP would not be active. We could potentially just use the primary WAN IP which would change dynamically when the WAN changes, but we also have about 3 web sites internally, we could use different ports, but it seems the SonicWALL would support this.
How do we make the outbound NAT failover as well?