P-870HN-5
x
b Support Notes
All contents copyright (c) 2009 ZyXEL Communications Corporation.
The following table summarizes these types.
NAT Type
IP Mapping
Mapping
Direction
One-to-One
ILA1<--->IGA1
Both
Many-to-One
ILA1---->IGA1
ILA2---->IGA1
...
Outgoing
Many-to-Many
Overload
ILA1---->IGA1
ILA2---->IGA2
ILA3---->IGA1
ILA4---->IGA2
...
Outgoing
Many-to-Many
No
Overload
(Allocate
by
Connections)
ILA1---->IGA1
ILA2---->IGA3
ILA3---->IGA2
ILA4---->IGA4
...
Outgoing
Server
Server 1 IP<----IGA1
Server 2 IP<----IGA1
Incoming
Port numbers for some services:
Service
Port Number
FTP
21
Telnet
23
SMTP
25
DNS (Domain Name Server)
53
www-http (Web)
80
