D-Link DSR-250 Product Manual - Page 13

Unified Services Router User Manual Site-to-site VPN tunnels use IP Security (IPsec) Protocol, Point-to-Point Tunneling Protocol (PPTP), or Layer 2 Tunneling Protocol (L2TP) to facilitate branch office connectivity through encrypted virtual links. The DSR-250/250N, DSR-500/500N and DSR-1000/1000N support 25, 35 and 75 simultaneous IPSec VPN tunnels respectively.  Efficient D-Link Green Technology As a concerned member of the global community, D-Link is devoted to providing eco-friendly products. D-Link Green WiFi and D-Link Green Ethernet save power and prevent waste. The D-Link Green WLAN scheduler reduces wireless power automatically during off-peak hours. Likewise the DLink Green Ethernet program adjusts power usage based on the detected cable length and link status. In addition, compliance with RoHS (Restriction of Hazardous Substances) and WEEE (Waste Electrical and Electronic Equipment) directives make D-Link Green certified devices the environmentally responsible choice.  Support for the 3G wireless WAN USB dongle is only available for DSR-1000 and DSR-1000N. 1.1 About this User Manual This document is a high level manual to allow new D-Link Unified Services Router users to configure connectivity, setup VPN tunnels, establish firewall rules and perform general administrative tasks. Typical deployment and use case scenarios are described in each section. For more detailed setup instructions and explanations of each configuration parameter, refer to the online help that can be accessed from each page in the router GUI. 1.2 Typographical Conventions The following is a list of the various terms, followed by an example of how that term is represented in this document:  Product Name - D-Link Unified Services Router. o Model numbers DSR-500/500N/1000/1000N/250/250N  GUI Menu Path/GUI Navigation - Monitoring > Router Status  Important note -  11