P-660 series Support Notes
ature as ' mo rmation on IP address translation,
please refer to RFC 163 Address Translator (NAT).
How NAT works
local IP nternal Local Addresses (ILA) and the
ddresses as t dd , see the following figure. The
term 'inside' refers to th
by mapping the ILA to the IGA required for communication with hosts on other
th address (and TCP or UDP source port
orw the Internet ISP, thus making them appear
come fro he P-660
the origi ort numbers so incoming reply packets can
we call this fe Multi-NAT'. For re info
1, The IP Network
If we define the
global IP a
addresses as the I
he Inside Global A
e set of networks that are subject to translation. NAT operates
ress (IGA)
networks. It replaces
numbers) and then f
as if they had
keeps track of
have their original values restored.
e original IP source
ards each packet to
m the NAT system itself (e.g., the P-660 router). T
nal addresses and p
NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
One to One
In One-to-One mode, the P-660 maps one ILA to one IGA.
Many to One
In Many-to-One mode, the P-660 maps multiple ILA to one IGA. This is equivalent to
), ZyXEL's Single User Account feature that
previous ZyNOS routers supported (the SUA only option in today's routers).
any-to-Many Overload mode, the P-660 maps the multiple ILA to shared IGA.
SUA (i.e., PAT, port address translation
Many to Many Overload
In M
42
All contents copyright © 2005 ZyXEL Communications Corporation.
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