Netopia 4000-Series Supported traffic, Support for Microsoft Network MSN Messenger, Complex maps

Multiple Network Address Translation 3-5

Complex maps

Map lists and server lists are completely independent of each other. A Connection Profile can use one or the other or both.

MultiNAT allows complex mapping and requires more complex configuration than in earlier firmware versions. Multiple mapped interior subnets are supported, and the rules for mapping each of the subnets may be different. The figure below illustrates a possible multiNAT configuration.

Public Addresses

206.1.1.1

206.1.1.2

206.1.1.3

206.1.1.4

206.1.1.5

206.1.1.6

206.1.2.1– 6

(possible later)

192.168.1.1

}

Private Addresses	IP Host	NAT Type
192.168.1.253	Web/FTP Server	1:1 Static
192.168.1.254	E-mail Server	1:1 Static
192.168.1.1 – 252	LAN Users	1:1 Dynamic
192.168.1.1 – 252	LAN Users	1:Many PAT
192.168.1.1 – 252	LAN Users	1:1 Dynamic

In order to support 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 particular resource is not available, subordinate mappings can be defined that will redirect traffic.

Supported traffic

MultiNat supports the following IP protocols:

■PAT: TCP/UDP traffic which does not carry source or destination IP addresses or ports 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 carry or otherwise rely on the source or destination IP addresses in the data stream.

■Dynamic NAT: All IP protocol traffic which does not carry or otherwise rely on the source or destination IP addresses in the data stream.

Support for Microsoft Network (MSN) Messenger

Netopia Firmware Version 5.4 provides support for MSN Messenger/Windows Messenger applications via UPnP (see UPnP Support on page 10-2). Normal plain chat always works.

Support for AOL Instant Messenger (AIM) File Transfer

Netopia Firmware Version 5.4 provides Application Level Gateway (ALG) support 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.