Configuring IPv6 Addresses


Enabling IPv6 on Cisco Routers
There are two basic steps to activate IPv6 on a router. First, you must activate IPv6 traffic-forwarding on the router, and then you must configure each interface that requires IPv6.
By default, IPv6 traffic-forwarding is disabled on a Cisco router. To activate it between interfaces, you must configure the global command ipv6 unicast-routing.
The ipv6 address command can configure a global IPv6 address. The link-local address is automatically configured when an address is assigned to the interface. You must specify the entire 128-bit IPv6 address or specify to use the 64-bit prefix by using the eui-64 option.

IPv6 Address Configuration Example
You can completely specify the IPv6 address or compute the host identifier (rightmost 64 bits) from the EUI-64 identifier of the interface. In the example, the IPv6 address of the interface is configured using the EUI-64 format.
Alternatively, you can completely specify the entire IPv6 address to assign a router interface an address using the ipv6 addressipv6-address/prefix-length command in interface configuration mode.
Configuring an IPv6 address on an interface automatically configures the link-local address for that interface.

Cisco IOS IPv6 Name Resolution
There are two ways to perform name resolution from the Cisco IOS software process:
Define a static name for an IPv6 address using the ipv6 host name [port] ipv6-address1 [ipv6-address2...ipv6-address4] command. You can define up to four IPv6 addresses for one hostname. The port option refers to the Telnet port to be used for the associated host.
Specify the DNS server used by the router with the ip name-serveraddress command. The address can be an IPv4 or IPv6 address. You can specify up to six DNS servers with this command.

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