You can then create new Interfaces for the DHCP Relay Agent to enable the
relay for a specific network interface.
Figure 11-15 shows the properties for a new DHCP Relay Agent interface I created
with my Local Area Connection network interface. In this window, you can enable or
disable the relay of DHCP packets as well as configure hop-count and boot thresholds.
DHCPv6 Relay Agent is similar, except it forwards requests for IPv6 addresses instead.
Figure 11-14. DHCP Relay Agent Properties window
373 Chapter 11: Routing and Remote Access
Internet Group Management Protocol
Internet Group Management Protocol (IGMP) is another routing service you can install
on RRAS. You install it as you would any routing protocol (refer to the earlier exercise
where we install RIP). Once installed, you can attach it to various network interfaces.
You can then enable or disable IGMP on a given interface, configure its mode (router or
proxy), and specify its version. When configured in IGMP router mode, various options
are available in the IGMP Properties Router tab (see Figure 11-16).
Network Address Translation
NAT is a nice added feature to RRAS in Windows Server 2008. NAT is used everywhere
nowadays. In fact, almost every cable/DSL router works in NAT mode: The external interface
is configured with a valid IP address for the Internet, and the hosts behind it are typically
configured with private addresses, which are then NATed to the external address.
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