ZyXEL Communications P2000W - Manual (Page 84)

P-2000W_V2 User’s Guide
84 Chapter 12 User Web Configurator Screens
12.11.1 NAT Example
See the following figure. The Prestige (X) sends packets to the Internet. The Prestige’s IP
address is 10.0.0.3 (a private IP address). The NAT router maps the private source IP address
to a public source IP address (a.b.c.d).
Note: The NAT figures in this chapter use lower-case letters (like a.b.c.d for example)
to represent public IP addresses.
Figure 20 NAT: Outgoing
When the NAT router receives packets with destination address IP address a.b.c.d, the NAT
router changes a.b.c.d back to the private IP address 10.0.0.3 and sends it to the Prestige.
Figure 21 NAT: Incoming
12.11.2 NAT Types
This section discusses the following NAT types that may be implemented on a router in front
of the Prestige.
• Full Cone
• Restricted Cone
• Port Restricted Cone
• Symmetric
VoIPon www.voipon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 600030