NAT with Source Adresse Alias not working
I'm trying to secure my 3cx PBX additionally. I would like to allow the SIP ports to enter only from an Source Address alias (tel.t-online.de).
Here is a screenshot.
If I delete the source alias, it works. It also works with the public IP address. But not with an alias.
Does somebody has any idea?
Check if pfSense can resolve the host name.
It look's good!
And have you ensured that the inbound connections are deriving from that source IP only when the NAT source is any by checking the firewall log?
Under Diagnostics -> Tables, what is in the TelekomSIP table?
The problem is solved. The 3cx firewall check of course checks the ports from a different address than my aliases.