I am planning a new Asterisk installation, with a requirement that it needs to be behind a Cisco hardware firewall which does NAT to a single public IP address.
Any recommendations I have found say that I should multi-home the Asterisk server, i.e. use multiple NICs with eth0 being on the WAN side, and eth1 would be the internal network with my phones.
I do not see a logical reason why I do need to multi-home the server?
With a proper default route the network interface should route the packets properly to my NAT router.
Is it Asterisk which requires this?
I have done two such installations which were multi-homed, and they do work - but my question is, do I absolutely need to multi-home the server? Any differences in different Asterisk versions?