NETGEAR FVS318N manual DHCPv6 and Radvd interaction in the LAN

ProSafe Wireless-N 8-Port Gigabit VPN Firewall FVS318N

Configure the IPv6 Router Advertisement Daemon and Advertisement Prefixes for the LAN

Note: If you do not configure stateful DHCPv6 for the LAN but use stateless DHCPv6, you need to configure the Router Advertisement Deamon (RADVD) and advertisement prefixes.

The RADVD is an application that uses the Neighbor Discovery Protocol (NDP) to collect link-local advertisements of IPv6 addresses and IPv6 prefixes in the LAN. The RADVD then distributes this information in the LAN, which allows IPv6 clients to configure their own IPv6 address.

Hosts and routers in the LAN use NDP to determine the link-layer addresses and related information of neighbors in the LAN that can forward packets on their behalf. The wireless VPN firewall periodically distributes router advertisements (RAs) throughout the LAN to provide such information to the hosts and routers in the LAN. RAs include IPv6 addresses, types of prefixes, prefix addresses, prefix lifetimes, the maximum transmission unit (MTU), and so on. In addition to configuring the RADVD, you also need to configure the prefixes that are advertised in the LAN RAs.

The following table provides an overview of how information is obtained in the LAN when you have configured a stateless DHCPv6 server and the RADVD:

Table 15. DHCPv6 and RADVD interaction in the LAN

Flags in the RADVD	DHCPv6 Server Provides	RADVD Provides
Managed RA flag is set	• IP address assignment	• IP address assignment
	• DNS server and other configuration information	• Prefix
		• Prefix length
		• Gateway address
Other RA flag is set	DNS server and other configuration information	• IP address assignment
		• Prefix
		• Prefix length
		• Gateway address

When the Managed flag is set in the RADVD, the DHCPv6 server can assign IP addresses, and the RADVD also assigns IP addresses in the sense that it provides information that allows IPv6 clients to configure their own IPv6 address.

When the Other flag is set, the DHCPv6 server does not assign IP addresses but provides DNS server and other configuration information only.

LAN Configuration

80