Netopia 4541 - Manual (Page 89)

Multiple Network Address Translation 9-5
In order to suppor t this type of mapping, you define two address ranges. First, you define a public range which
contains the first and last public address to be used and the way in which these addresses should be used
(PAT, static, or dynamic). You then configure an address map which defines the private IP address or addresses
to be used and which public range they should be mapped to. You add the address map to the list of address
maps which are configured, creating a map list. The mappings in the map list are order-dependent and are
compared in order from the top of the list to the bottom. If a par ticular resource is not available, subordinate
mappings can be defined that will redirect traffic.
Supported traffic
MultiNat suppor ts the following IP protocols:
■ PAT: TCP/UDP traffic which does not carr y source or destination IP addresses or por ts in the data stream
(i.e., HTTP, Telnet, ‘r’ commands, tftp, NFS, NTP, SMTP, NNTP, etc.).
■ Static NAT: All IP protocol traffic which does not carr y or other wise rely on the source or destination IP
addresses in the data stream.
■ Dynamic NAT: All IP protocol traffic which does not carr y or other wise rely on the source or destination IP
addresses in the data stream.
MultiNAT Configuration
You configure the MultiNAT features through the console menu:
■ For a simple 1-to-many NAT configuration (classic NAT or PAT), use the Easy Setup Profile configuration ,
described below.
■ For the more advanced features, such as ser ver lists and dynamic NAT, follow the instructions in:
■ IP setup , described on page 9-7
■ IP profile parameters , described on page 9-20