ZyXEL Communications P-870HN-5xb Support Notes page 51

The following table summarizes these types.
NAT Type
One-to-One
Many-to-One
Many-to-Many
Overload
Many-to-Many No
Overload
(Allocate by
Connections)
Server

Port numbers for some services:
Service
FTP
Telnet
SMTP
DNS (Domain Name Server)
www-http (Web)
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Mapping
IP Mapping
Direction
ILA1<--->IGA1 Both
ILA1---->IGA1
ILA2---->IGA1 Outgoing
...
ILA1---->IGA1
ILA2---->IGA2
ILA3---->IGA1 Outgoing
ILA4---->IGA2
...
ILA1---->IGA1
ILA2---->IGA3
ILA3---->IGA2 Outgoing
ILA4---->IGA4
...
Server 1 IP<----IGA1
Incoming
Server 2 IP<----IGA1
Port Number
21
23
25
53
80
P-870HN-5xb Support Notes