designed with mobile wireless devices in mind. It is in the public domain and is therefore subject to no copyright protection. Mobile Mesh-This implementation involves three separate types of proto- cols, each addressing a specific function: link discovery protocol, routing protocol, and border discovery protocol. Mobile Mesh is covered in the GNU General Public License version 2. Topology Broadcast Based on Reverse-Path Forwarding (TBRPF)-TBRPF is a proactive link-state routing protocol designed for mobile ad hoc net- works. It provides hop-by-hop routing along minimum-hop paths to each destination. It is now patent protected but may become an IETF standard. Open Shortest Path First (OSPF)-OSPF is a link-state routing protocol designed to be run internal to a single autonomous system. (Autonomous systems are discussed in Chapter 8, "The Internet and IP Infrastructures.") GNU Zebra-This free software manages TCP/IP-based routing protocols. It is distributed under the GNU General Public License. It supports BGP-4, RIPvl, RIPv2, and OSPFv2. Chapter 15 WMANs, WLANs, and WPANs LocustWorld-This is a free bootable CD solution based on AODV. Locust- World (www.locustworld.com) also sells a complete ready-to-deploy Mesh- Box product that runs its software. 4G MeshCube-This product was developed by the German company 4G Mobile Systems (www.4g-systems.com). It runs Debian Linux on a MIPS processor, using MITRE Mobile Mesh routing software. It is a ready-to- deploy gateway with both wireless and wired interfaces. It features low power consumption of 4 watts or lower. Of course, there are many more protocols and implementations under develop- ment, SO stay tuned. Benefits of and Considerations for Mesh Networks The key attributes of mesh networks include the following: Cost-effective-Mesh networks have affordable components, installation, and ongoing maintenance. Rapid, easy, and simple deployment-The setup of mesh networks is extremely easy, involving a box that is preinstalled with wireless mesh soft- ware and uses standar