This is a quote from the help file: "If your public DNS name or IP
address
redirects requests to a private iFolder IP address, specify a DNS name

(not an IP address) as the public address of the iFolder server. Then,

make sure you are using an internal DNS server to resolve the DNS name
to
the private address for internal users and use an external DNS server
to
resolve the DNS name to the public address of external users."

Am I to understand that you can only use iFolder 2.1 behind a firewall
if
you have a registered DNS name?