Setting up the network

About NAT types for VPNos 3.X

For VPNos 3.X, you can set the following types of NAT mapping on the VSU.

Static Mapping – Addresses from one network are permanently mapped to addresses on another network. Static mapping works when traffic is initiated either inside or outside of the private network.

Dynamic Mapping – Addresses from one network are temporarily mapped to an address from another network. When traffic is initiated from a client on the private network, its address is temporarily mapped to an address selected from a pool of public addresses.

When the client traffic is idle for a specified period of time, the mapped address is returned to the pool of available addresses. When all public addresses have been assigned, no other private clients can initiate traffic until a public address becomes available.

Dynamic mapping works only for connections initiated from the private network.

Port Mapping – This option is similar to dynamic mapping except that only one public IP address is required. The security gateway maps every packet from the private network to the public IP address and a source port selected from a predefined range of TCP and UDP port numbers. When traffic is initiated from a client on the private network it is dynamically mapped to the public IP address and an available port number.

When the client traffic is idle for a specified period of time, the port number is returned to the pool of available port numbers. When all port numbers have been allocated, no other private clients can initiate traffic until a port number becomes available.

Port mapping works only for connections initiated from the private network. In addition, port mapping works only for TCP and UDP traffic.

NAT applications

Network administrators may choose to use the NAT mechanism for any of the following reasons:

Allow access to the Internet from private networks. Networks which are assigned private addresses, such as 10.0.0.0 (RFC 1918), or addresses that have not been registered must be mapped to public addresses to allow users access to the Internet.

Provide support for more hosts with fewer public addresses. Address mapping allows network administrators to increase the number of hosts that can access the Internet without needing additional registered network addresses.

Hide host addresses for security reasons. Network administrators may choose to use address mapping to hide actual host addresses from the public.

Set up VPNs that include overlapping private addresses. Address mapping allows network administrators to set up VPNs between two sites that use the same private network addresses. For example, both sites may be using 10.0.0.0 private network addresses.

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Avaya 3.7 manual About NAT types for VPNos, NAT applications

3.7 specifications

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