Technical Reference; Nat Definitions - ZyXEL Communications VMG3312-T20A User Manual

Figure 91 Network Setting > NAT > Sessions
The following table describes the fields in this screen.
Table 66 Network Setting > NAT > Sessions
LABEL
MAX NAT
Session Per Host
(0 ~ 20480)
Apply
Cancel

11.9 Technical Reference

This part contains more information regarding NAT.

11.9.1 NAT Definitions

Inside/outside denotes where a host is located relative to the VMG, for example, the computers of your
subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for example,
the local address refers to the IP address of a host when the packet is in the local network, while the
global address refers to the IP address of the host when the same packet is traveling in the WAN side.
Note that inside/outside refers to the location of a host, while global/local refers to the IP address of a
host used in a packet. Thus, an inside local address (ILA) is the IP address of an inside host in a packet
when the packet is still in the local network, while an inside global address (IGA) is the IP address of the
same inside host when the packet is on the WAN side. The following table summarizes this information.
Table 67 NAT Definitions
ITEM
Inside
Outside
Local
Global
NAT never changes the IP address (either local or global) of an outside host.
Chapter 11 Network Address Translation (NAT)
DESCRIPTION
Use this field to set a limit to the number of concurrent NAT sessions each client host can have.
If only a few clients use peer to peer applications, you can raise this number to improve their
performance. With heavy peer-to-peer application use, lower this number to ensure no single
client uses too many of the available NAT sessions.
Click this to save your changes on this screen.
Click this to exit this screen without saving any changes.
DESCRIPTION
This refers to the host on the LAN.
This refers to the host on the WAN.
This refers to the packet address (source or destination) as the packet travels on the LAN.
This refers to the packet address (source or destination) as the packet travels on the WAN.
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