ZyXEL Communications P-2812HNU-51c manual 100

Chapter 5 WAN Setup

•Port Restricted Cone

•Symmetric

The following table summarizes how these NAT types handle outgoing and incoming packets. Read the following sections for more details and examples.

Table 17	NAT Types
		RESTRICTED	PORT
	FULL CONE		RESTRICTED	SYMMETRIC
		CONE
			CONE
Incoming	Any external	Only external	Only external	A host on the external
Packets	host can send	hosts with an IP	hosts with an IP	network can only send
	packets to the	address to which	address and port	packets to the specific
	mapped external	the internal host	to which the	mapped external IP
	IP address and	has already sent	internal host has	address and port that
	port.	a packet can	already sent a	the NAT router used in
		send packets to	packet can send	sending a packet to
		the mapped	packets to the	the external host’s IP
		external IP	mapped external	address and port.
		address and port.	IP address and
			port.
Outgoing	The NAT router maps the internal IP address and port			The NAT router maps
Packets	of all outgoing packets to a single IP address and port			the internal IP address
	on the external network.			and port of each
				outgoing packet to a
				different external IP
				address and port for
				each different
				destination IP address
				and port.

The examples in these NAT type sections describe NAT translation between internal (private) and external (public) IP addresses.

IPv6

IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The P-2812HNU-51c supports IPv4/IPv6 dual stack and can run IPv4 and IPv6 at the same time. See Appendix F on page 483 for more information about IPv6.

3G

3G (Third Generation) is a digital, packet-switched wireless technology. Bandwidth usage is optimized as multiple users share the same channel and bandwidth is only allocated to users when they send data. It allows fast transfer of voice and non-voice data and provides broadband Internet access to mobile devices.

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	P-2812HNU-51c User’s Guide