Nat Mapping Types; Figure 173 Port Restricted Cone Nat Example; Table 85 Nat Mapping Types - ZyXEL Communications ZYWALL P1 User Manual

Chapter 16 Network Address Translation (NAT)

Figure 173 Port Restricted Cone NAT Example

16.1.6 NAT Mapping Types

NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the ZyWALL maps one local IP address to one global
IP address.
• Many to One: In Many-to-One mode, the ZyWALL maps multiple local IP addresses to
one global IP address. This is equivalent to SUA (that is, PAT, port address translation),
ZyXEL's Single User Account feature (the SUA option).
• Many to Many Overload: In Many-to-Many Overload mode, the ZyWALL maps the
multiple local IP addresses to shared global IP addresses.
• Many One to One: In Many-One-to-One mode, the ZyWALL maps each local IP address
to a unique global IP address.
• Server: This type allows you to specify inside servers of different services behind the
NAT to be accessible to the outside world.
Port numbers do not change for One-to-One and Many-One-to-One NAT
mapping types.
The following table summarizes the NAT mapping types.

Table 85 NAT Mapping Types

TYPE
One-to-One
Many-to-One (SUA/PAT)
274
IP MAPPING
ILA1 < > IGA1
ILA1 < > I IGA1
ILA2 < > I IGA1
...
ZyWALL P1 User's Guide