What Ip/Port Mapping Does Multi-Nat Support - ZyXEL Communications P-660HN-T1A Support Notes

With SUA, 'visible' servers had to be mapped to different ports, since the
servers share only one global IP. But when you select Full Feature, you can
make multiple local servers (mapping the same port or not) on the LAN
accessible from outside with multiple global IP addresses.

Support Non-NAT Friendly Applications
Some servers providing Internet applications such as some MIRC servers do
not allow users to login using the same IP address. Thus, users on the same
network can not login to the same server simultaneously. In this case it is
better to use Many-to-Many No Overload or One-to-One NAT mapping types,
thus each user login to the server using a unique global IP address.

12. What IP/Port mapping does Multi-NAT support?

Multi-NAT supports five types of IP/port mapping: One to One, Many to One,
Many to Many Overload, Many to Many No Overload and Server. The details
of the mapping between ILA and IGA are described as below. Here we define
the local IP addresses as the Internal Local Addresses (ILA) and the global IP
addresses as the Inside Global Address (IGA),

One to One: In One-to-One mode, the P-660HN-T1A maps one ILA to
one IGA.

Many to One: In Many-to-One mode, the P-660HN-T1A maps multiple
ILA to one IGA. This is equivalent to SUA (i.e., PAT, port address
translation), ZyXEL's Single User Account feature (the SUA is optional
in today's Prestige routers).

Many to Many Overload: In Many-to-Many Overload mode, the
P-660HN-T1A maps the multiple ILA to shared IGA.

Many One-to-One: In Many One-to-One mode, the P-660HN-T1A
maps each ILA to unique IGA.

Server: In Server mode, the P-660HN-T1A maps multiple inside
servers to one global IP address. This allows us to specify multiple
servers of different types behind the NAT for outside access. Note, if
you want to map each server to one unique IGA please use the
One-to-One mode.
The following table summarizes the five types.
NAT Type IP Mapping
One-to-One ILA1<--->IGA1
ILA1<--->IGA1
Many-to-One
ILA2<--->IGA1
(SUA/PAT)
...
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P-660HN Series Support Notes
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