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221 02-FGB 101 327 Uen C – December 2006 17
3 Data Features and Function
3.1 Layer 2 Functions
3.1.1 Bridging LAN and WLAN
The W2x terminals support bridging/switching traffic between the LAN and
WLAN interfaces.
3.1.2 WLAN Whitelist
The W2x terminals support WLAN whitelist, also known as “MAC
Association Control” or “MAC Access List”. Up to 20 WLAN MAC
addresses can be added to the list and the use of the whitelist is possible to
enable/disable.
3.2 Internet Protocol Services
The Internet Services in the W2x terminals are based on the Internet
Protocol version 4 (IPv4).
3.2.1 IP Forwarding
The W2x terminals support IP forwarding and employs ingress traffic
filtering on both the LAN and the WAN interfaces.
3.2.2 DNS
The W2x terminals include a DNS proxy server which responds to DNS
requests from the local LAN/WLAN. It contains a small database of local
host names and addresses supplied by client DHCP requests.
In addition it also caches requests to remote DNS servers.
3.2.3 DHCP Server
The W2x terminals include a DHCP server for LAN/WLAN interfaces.
The DHCP server maintains a pool of IP addresses and distributes them to
LAN/WLAN hosts whenever they are switched on. It also puts the
hostname, supplied by the client DHCP request, in the local DNS proxy.
3.2.4 SNTP
The W2x terminals include a SNTP client which provides a way to
synchronize the device’s own time of day setting with a remote NTP server.
It is possible to specify up to three (3) different SNTP servers (for fallback).
3.2.5 NAT
The W2x terminals support dynamic one-to-many NAT - also known as
NAPT. NAPT translates the source IP address of the LAN to the public
WAN IP address. It also changes the source port (UDP or TCP) or the
ICMP for the WAN to LAN flow. Port translation allows several LAN devices
to be connected to the WAN through one public IP address.