ZyXEL P-2812HNU-51c User Manual Page 100

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Chapter 5 WAN Setup
P-2812HNU-51c User’s Guide
100
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.
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.
Table 17 NAT Types
FULL CONE
RESTRICTED
CONE
PORT
RESTRICTED
CONE
SYMMETRIC
Incoming
Packets
Any external
host can send
packets to the
mapped external
IP address and
port.
Only external
hosts with an IP
address to which
the internal host
has already sent
a packet can
send packets to
the mapped
external IP
address and port.
Only external
hosts with an IP
address and port
to which the
internal host has
already sent a
packet can send
packets to the
mapped external
IP address and
port.
A host on the external
network can only send
packets to the specific
mapped external IP
address and port that
the NAT router used in
sending a packet to
the external host’s IP
address and port.
Outgoing
Packets
The NAT router maps the internal IP address and port
of all outgoing packets to a single IP address and port
on the external network.
The NAT router maps
the internal IP address
and port of each
outgoing packet to a
different external IP
address and port for
each different
destination IP address
and port.
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