ZyXEL Communications NBG410W3G - Manual (Page 229)

Chapter 12 Network Address Translation (NAT)
NBG410W3G Series User’s Guide
229
Figure 138 Port Restricted Cone NAT Example
12.1.6 NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
• One to One: In One-to-One mode, the ZyXEL Device maps one local IP address to one
global IP address.
• Many to One: In Many-to-One mode, the ZyXEL Device maps multiple local IP
addresses to one global IP address. This is equivalent to SUA (i.e., PAT, port address
translation), ZyXEL's Single User Account feature (the SUA option).
• Many to Many Overload: In Many-to-Many Overload mode, the ZyXEL Device maps
the multiple local IP addresses to shared global IP addresses.
• Many One to One: In Many-One-to-One mode, the ZyXEL Device 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 although, it is highly recommended that you use
the DMZ port for these servers instead.
"
Port numbers do not change for One-to-One and Many-One-to-One NAT
mapping types.
NAT
1, A 2, B
3, C
4, D
4, E
5