Motorola Netopia Embedded Software, Handbook

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Multi-NAT 4-5
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.
Support for AOL Instant Messenger (AIM) File Transfer
Motorola Netopia® Embedded Software Version 8.7.4 provides Application Level Gateway (ALG) suppor t for
AOL Instant Messenger (AIM) file transfer. This allows AIM users to exchange files, even when both users are
behind NAT. Previously, the file transfer function would work only if one or neither of the two users were behind
NAT.
Currently there is a restriction that the remote user must be routed to via the WAN inter face, other wise the
connections will fail. There is no restriction as to the number of connections.
There is no user configuration required for this feature.
Support for Yahoo Messenger
Motorola Netopia® Embedded Software Version 8.7.4 provides Application Level Gateway (ALG) suppor t for
Yahoo Messenger. This allows Yahoo Messenger users to exchange files, even when both users are behind NAT.
Previously, the file transfer function would work only if one or neither of the two users were behind NAT.
Private Addresses IP Host Public Addresses NAT Type
192.168.1.253
192.168.1.254 206.1.1.1
206.1.1.2
206.1.1.3
206.1.1.4 1:1 Static
1:1 Static
206.1.1.5
206.1.1.6
192.168.1.1 – 252
192.168.1.1 – 252
Web/FTP Ser ver
E-mail Ser ver
1:1 Dynamic
1:1 Dynamic
LAN Users
LAN Users
206.1.2.1 – 6 LAN Users
1:Many PAT
(possible later)
192.168.1.1
}
192.168.1.1 – 252