Nat Settings - ZyXEL Communications NR2101 User Manual

The following table summarizes how these NAT types handle outgoing and incoming packets.
Table 30 NAT Types
Incoming
Packets
Outgoing
Packets

8.2 NAT Settings

Use this screen to Enable IP Pass-Through and VPN Pass-Through protocols. Click NAT SETTINGS to open
the following screen.
Note: To select NAT Type from the drop down menus or edit DMZ IP, you must disable IP Pass-
Through.
Chapter 8 NAT
ADDRESS
FULL CONE
RESTRICTED
Any external host Only external hosts
can send packets to with an IP address to
the mapped which the internal
external IP address host has already
and port. sent a packet can
send packets to the
mapped external IP
address and port.
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.
NR2101 User's Guide
PORT RESTRICTED
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.
76
SYMMETRIC
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.
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.