Chapter 11 Network Address Translation (NAT)
VMG1312-Bx0D User’s Guide
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Figure 89 Network Setting > NAT > Sessions
The following table describes the fields in this screen.
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 65 Network Setting > NAT > Sessions
LABEL DESCRIPTION
MAX NAT
Session Per
Host
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.
Apply Click this to save your changes on this screen.
Cancel Click this to exit this screen without saving any changes.
Table 66 NAT Definitions
ITEM DESCRIPTION
Inside This refers to the host on the LAN.
Outside This refers to the host on the WAN.
Local This refers to the packet address (source or destination) as the packet travels on the
LAN.
Global This refers to the packet address (source or destination) as the packet travels on the
WAN.
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