Cabletron Systems CSX100 series, Руководство пользователя, Страница: 86 / 153

ISDN Router 72
Network Address Translation (NAT)
NAT is an IP address conversion feature that translates a PC’s local (internal)
address into a temporary global (outside/Internet) IP address.
NAT is needed when a PC (or several PCs) on a Local Area Network wants to
connect to the outside Internet to get to a remote network: NAT swaps the
local IP address to a global IP address. Our version of NAT goes one step
further by allowing several PCs to share one single IP address to the Internet,
thus reducing connection costs. In effect, it allows a whole LAN to connect to
the Internet as a Single User.
Enable NAT
Important : Make sure that IP routing is enabled.
⇒
From the Configuration Manager’s main menu, click Remote Routers
and then TCP/IP Route Addresses .
⇒
In the TCP/IP Routes window, check the Enable Address Translation
box.
Source and Remote WAN Port Address
This information is required if you are running NAT and the remote router
does not dynamically assign the local/target router WAN Port Address. This
address corresponds to the global IP address and is obtained from your
Network Service Provider.
Most users do not need them as the router can automatically handle the
numbered and unnumbered modes of IP address negotiation.
⇒
In the TCP/IP Routes window, click Advanced .
⇒
In the Source WAN Port Address window, enter the IP Address and its
corresponding Subnet Mask and click OK .
Note: For information on WAN RIP settings, refer to the next topic, Routing
Information Protocol .