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Configuring Network Address Translation
308625-14.00 Rev 00
2-9
Static Address Translation
Using static address translation, you can create a one-to-one translation of an
unregistered local host address to a global address. A static address translation
mapping does not time out, but remains configured until you disable or delete it.
For instructions on how to create and enable static translation, see “Configuring
Static Address Translation” on page 2-38.
N-to-1 Translation
N-to-1 translation allows you to translate a range of local IP addresses on a private
network into a single global IP address. The router maps a local address to the
global address, assigning it a unique Transmission Control Protocol (TCP) port
number. N-to-1 mappings are removed after a specified timeout period, unless the
timeout parameter is disabled. For instructions on how to configure N-to-1
translation, see “Configuring Network Address Port (N-to-1) Translation
” on page
2-53
.
NAT Synchronization
NAT synchronization allows NAT routers configured as peers to share address
translation information. If one NAT router fails, traffic can be rerouted to a peer
NAT router operating in the same synchronized configuration. Up to 10 NAT
routers can be synchronized.
A NAT router sends updates to peer routers each time that it creates or deletes a
dynamic translation. Synchronization works in the following manner:
1.
When router A performs a new translation, it adds the entry to its own table
and sends (via TCP connection) an update to its peer, router B.
2.
Router B adds the translation entry to its table.
3.
If the translation entry times out, router A deletes the entry and sends the
deletion update to router B.
4.
Router B does one of the following:
• Deletes the translation if it has not received traffic using that address
translation.
• Or, if it has received traffic using that address translation, router B ignores
the deletion update and sends a new translation update to router A. Router
A then adds the translation back into its table.