Ericsson W2x Series - Manual (Page 18)

18 221 02-FGB 101 327 Uen C - December 2006
3.2.5.1 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 a public WAN IP address on the W2x
terminals.
3.2.5.2 NAT ALGs
An ALG enables the transfer of specific application streams through firewall
policies and NAT. This is enabled by creating dynamic holes in the firewall
policy and NAT and changing IP addresses in network protocol headers,
and if a secondary port is required, the ALG will open one.
The W2x terminals include NAT ALGs for the following protocols:
• FTP
• TFTP
The included ALGs can be enabled/disabled individually and do not require
any additional configuration.
3.2.6 IP Quality of Service
The QoS service in the W2x terminals support the Stochastic Fair Queuing
(SFQ) scheduling algorithm which makes sure that no single session can
dominate outgoing bandwidth.
The QoS feature applies for upstream traffic only.
3.2.7 UPnP
The W2x terminals support 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.
3.2.8 VPN Pass-Through
The W2x terminals support IPSec VPN (Virtual Private Network) pass-
through.
3.2.9 PPP Clients
The W2x terminals include a PPP client for WAN access.
For authentication both the PAP (Password Authentication Protocol) and
CHAP (Challenge Handshake authentication Protocol) protocols are
supported.
3.2.10 SIP (W25 only)
The Ericsson W25 supports the SIP protocol (RFC 3261) for T.38 Fax over
IP.
3.3 USB Services
The W2x terminals function as a network storage device for LAN hosts
using SMB/CIFS (as printer and file sharing in Windows).