System information

221 02-FGB 101 544 Uen H – June 2009 29
ICMP for the WAN to LAN flow. Port translation allows several LAN devices
to be connected to the WAN through one public IP address.
5.2.10.1 NAT Port Forwarding
The NAT Port Forwarding feature, sometimes referred to as Virtual Server,
redirects traffic from the WAN side to a server on the LAN side.
The Port Forwarding feature requires that the Ericsson W3x has a public IP
address for Port Forwarding requests from the Internet to be handled
correctly. Public IP for the subscription needs to be provided by the
operator.
5.2.10.2 NAT ALGs
An ALG enables the transfer of specific application streams through NAT.
This is enabled by creating dynamic holes in NAT and changing IP
addresses in network protocol headers, and if a secondary port is required,
the ALG will open one.
The Ericsson W3x includes NAT ALGs for the following protocols:
• FTP
• TFTP
• RTSP
• SIP
• PPTP
The included ALGs can be enabled/disabled individually and do not require
any additional configuration.
5.2.11 UPnP IGD
The Ericsson W3x supports the UPnP standard with respect to the Internet
Gateway Device (IGD) profile, used by Microsoft Messenger (among
others) to configure port forwarding in a NAT router.
5.2.12 VPN Pass-Through
The Ericsson W3x supports VPN pass-through from a client on the LAN
connecting to a VPN server on the Internet without any configuration.
Supported protocols are IPsec and PPTP (Microsoft VPN) with the
following limitations:
• The IPsec client and server must support NAT-T (NAT Traversal).
• Only one client at a time can use PPTP, unless the PPTP ALG is
enabled.
Other VPN pass-through configurations, such as a VPN server residing on
the Ericsson W3x LAN, is also possible provided the appropriate
ports/protocols are forwarded.