I'm configuring an outgoing server (i.e. only a private listener) on ESA C370 with AsyncOS 8.0.1.
I use the Internet's Root DNS Servers, and my default SMTP route is empty. My ESA is connected to 3 networks : production (default gateway), administration and failover (1 interface/network).
I would like to deploy a failover solution with an extra ESA on the failover network : if I lose my internet connection (impossible to join DNS and remote MX), my ESA would redirect all its mails to the extra ESA.
The ESA has no way to automatically fallback to a static IP if DNS in unreachable. The best on-box solution I can suggest is manually changing the 'All Other Domains' SMTP Routes entry when such an event occurs.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...