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Reference Manual for the ProSafe Wireless 802.11g Firewall/Print Server Model FWG114P v2
F-8 Virtual Private Networking
201-10301-02, May 2005
It will also be important to know the subnet mask of both gateway LAN Connections.
Firewalls
It is important to understand that many gateways are also firewalls. VPN tunnels cannot function
properly if firewall settings disallow all incoming traffic. Please refer to the firewall instructions
for both gateways to understand how to open specific protocols, ports, and addresses that you
intend to allow.
Setting Up a VPN Tunnel Between Gateways
An SA, frequently called a tunnel, is the set of information that allows two entities (networks, PCs,
routers, firewalls, gateways) to “trust each other” and communicate securely as they pass
information over the Internet.
Table 5-3. WAN (Internet/Public) and LAN (Internal/Private) Addressing
Gateway LAN or WAN VPNC Example Address
Gateway A LAN (Private) 10.5.6.1
Gateway A WAN (Public) 14.15.16.17
Gateway B LAN (Private) 22.23.24.25
Gateway B WAN (Public) 172.23.9.1
Table 5-4. Subnet Addressing
Gateway LAN or WAN Interface Name Example Subnet Mask
Gateway A LAN (Private) Subnet Mask A 255.255.255.0
Gateway B LAN (Private) Subnet Mask B 255.255.255.0