ZyXEL Communications ZyXEL ZyWALL P1 - Manual (Page 180)

ZyWALL P1 User’s Guide
Chapter 11 Network Address Translation (NAT) 179
• One to One: In One-to-One mode, one local IP address is mapped 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 (i.e., PAT, port address translation),
ZyWALL's Single User Account feature.
• Many to Many Overload: In Many-to-Many Overload mode, multiple local IP
addresses are mapped to shared global IP addresses.
• Many One to One: In Many-One-to-One mode, each local IP address is mapped 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.
Note: Port numbers do not change for One-to-One and Many-One-to-One NAT
mapping types.
The following table summarizes these types.
11.2 Using NAT
Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from
the WAN to be forwarded through the ZyWALL.
Table 63 NAT Mapping Types
TYPE IP MAPPING ABBREVIATION
One-to-One ILA1ÅÆ IGA1 1-1
Many-to-One (SUA/PAT) ILA1ÅÆ IGA1
ILA2ÅÆ IGA1
… M-1
Many-to-Many Overload ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA1
ILA4ÅÆ IGA2
… M-M Ov
Many-One-to-One ILA1ÅÆ IGA1
ILA2ÅÆ IGA2
ILA3ÅÆ IGA3
… M-1-1
Server Server 1 IPÅÆ IGA1
Server 2 IPÅÆ IGA1
Server 3 IPÅÆ IGA1 Server