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ZyXEL Communications 1001H User Manual

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P100IH ISDN Router
NAT
4-3
Table 4-1 NAT Mapping Types
Type
IP Mapping
One-to-One
ILA1
ÅÆ IGA1
Many-to-One (SUA/PAT)
ILA1
ÅÆ IGA1
ILA2
ÅÆ IGA1
…
Many-to-Many Overload
ILA1
ÅÆ IGA1
ILA2
ÅÆ IGA2
ILA3
ÅÆ IGA1
ILA4
ÅÆ IGA2
…
Many-to-Many No Overload
ILA1
ÅÆ IGA1
ILA2
ÅÆ IGA2
ILA3
ÅÆ IGA3
…
Server
Server 1 IP
ÅÆ IGA1
Server 2 IP
ÅÆ IGA1
Server 3 IP
ÅÆ IGA1
4.2 NAT 
Application
The following figure illustrates a possible NAT application, where three inside LANs behind the Prestige can
“talk” to three distinct Internet destinations. More examples follow at the end of this chapter.