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Network Configuration—Routing and BridgingYour FreeBSD host can be used as a router. In fact, some vendors such as JuniperNetworks use FreeBSD as the base operating system for their high-end routers. Sincea router is an important and vital node in every network, using FreeBSD as a routeris a good choice. It is already stable and supports many cutting edge standards andprotocols, out of the box.In this chapter, you will get familiar with basic IP forwarding in FreeBSD, as wellas routed and route6d daemons, the built-in routing daemons that support RIPv1,RIPv2, RIPng (for IPv6) and RDISC.There are plenty of IP routing related software that you can find in FreeBSD's portssystem. Two of them —OpenOSPFD and OpenBGPD—are covered in this chapter.As their name suggests, they both support a major routing protocol that almost everynetwork incorporates—OSPF and BGP.Other routing software include Zebra, Quagga, and XORP, which are not coveredin this chapter. But they are worth looking into, as they might fit into your networkinfrastructure.Using these tools, you can turn your FreeBSD 7 host into a routing powerhouse.In this chapter, we will look into the following:• Basic routing–IP forwarding• Running OSPF—OpenOSPFD• Running BGP—OpenBGPD• Bridging• Proxy ARP.