168.99.1
IPv6: 3ffe:b00:c18:1::3
IPv4: 192.168.30.1
IPv6: 3ffe:b00:c18:1::2
IPv6
Network
IPv6
Network
A B
Transitioning to IPv6 287
Tunnel endpoints can be unnumbered, but unnumbered endpoints make troubleshooting
dif?¬?cult. The IPv4 practice of saving addresses for tunnel endpoints is no longer an issue
for IPv6.
Configuring IPv6
There are two basic steps to activate IPv6 on a router. First you must activate IPv6 traf?¬?c
forwarding on the router, and then you must con?¬?gure each interface that requires IPv6.
By default, IPv6 traf?¬?c forwarding is disabled on a Cisco router. To activate IPv6 traf?¬?c
forwarding between interfaces, you must con?¬?gure the global command ipv6 unicastrouting.
This command enables the forwarding of unicast IPv6 traf?¬?c.
The ipv6 address command can con?¬?gure a global IPv6 address. The link-local address is
automatically con?¬?gured when an address is assigned to the interface. You must specify the
entire 128-bit IPv6 address or specify to use the 64-bit pre?¬?x by using the eui-64 option.
You can completely specify the IPv6 address or compute the host identi?¬?er (rightmost 64
bits) from the EUI-64 identi?¬?er of the interface.
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