One corporation in a business floor，far-end users of this corporation want to link with gateway access in outside by our SVN3000 VPN，but this floor only has one public network exit，and this corporation has no public ip
Consider this corporation has no public network ip，and SVN3000 mount to intranet exit firewall of itself. We suggest apply a public network ip，being a virtual ip，and as a exit of itself network
But client want to achieve SSL VPN long-distance accessed by in existence network situation，mapping SVN3000 need interface 8443 and 443.After did twice NAT server，network user can access in SVN3000.
this corporation need to use SVN3000 as the gateway of VPN，surely it need to have public network address which can mapping for far-end users to access in