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Revision: V1.0
Jan. 19 2008
one global IP address.
2. Many-to-One: In Many-to-One mode, the DSL-2140/2140W maps multiple local IP
addresses to one global IP address.
3. Many-to-Many Overload: In Many-to-Many Overload mode, the DSL-2140/2140W
maps multiple local IP addresses to shared global IP addresses.
4. Many-to-Many No Overload: In Many-to-Many No Overload mode, the
DSL-2140/2140W maps each local IP address to a unique global IP address.
5. Server: This type allows you to specify inside servers of different services behind the
NAT to be accessible to the outside world.
The following table summarizes these types.
TYPE IP
MAPPING
One-to-One
ILA1 IGA1
Many-to-One (SUA/PAT)
ILA1 IGA1
ILA2 IGA1
…
Many-to-Many Overload
ILA1 IGA1
ILA2 IGA2
ILA3 IGA1
ILA4 IGA2
…
Many-to-Many No Overload ILA1 IGA1
ILA2 IGA2
ILA3 IGA3
…
Server
Server 1 IP IGA1
Server 2 IP IGA1
Server 3 IP IGA1
5.3.2 DMZ
A demilitarized zone (DMZ) is a host between a private local network and the outside
public network. It prevents outside users from gaining access to a server that you wish to keep
private. Users of the public network outside the company can only access the DMZ host.