Configuring Ipv6 Tunnels - Cisco 200 Series Administration Manual

Configuring IP Information
Management and IP Interfaces
STEP 1
STEP 2
Cisco Small Business 200 Series Smart Switch Administration Guide

Configuring IPv6 Tunnels

The ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) enables
encapsulating IPv6 packets within IPv4 packets for transmission over IPv4
networks. You must first manually enable and configure an ISATAP tunnel. Then
you manually define an IPv6 interface at the ISATAP tunnel. Then the switch
automatically configures the link local IPv6 address to the IPv6 interface.
When defining ISATAP tunnels, note the following:
• An IPv6 link local address is assigned to the ISATAP interface. The initial IP
address is assigned to the interface, which is then activated.
• If an ISATAP interface is active, the ISATAP router IPv4 address is resolved
via DNS by using ISATAP-to-IPv4 mapping. If the ISATAP DNS record is not
resolved, ISATAP host name-to-address mapping is searched in the host
mapping table.
• When the ISATAP router IPv4 address is not resolved via the DNS process,
the ISATAP IP interface remains active. The system does not have a default
router for ISATAP traffic until the DNS process is resolved.
To configure an IPv6 Tunnel:
Click Administration > Management Interface > IPv6 Tunnel.
The IPv6 Tunnel Page opens.
Enter the values for the following fields:
• Tunnel Number—Displays the automatic tunnel router domain number.
• Tunnel Type—Always displayed as ISATAP.
• Source IPv4 Address—Disable the ISATAP tunnel, or enable the ISATAP
tunnel over an IPv4 interface. The IPv4 address of the selected IPv4 interface
used to form part of the IPv6 address over the ISATAP tunnel interface. The
IPv6 address has a 64-bit network prefix of fe80::, with the rest of the 64-bit
formed by concatenating 0000:5EFE and the IPv4 address.
- Auto —Automatically selects the lowest IPv4 address from among all of
its configured IPv4 interfaces.
None
- —Disable the ISATAP tunnel.
Manual
- —Manually configure an IPv4 address. The IPv4 address
configured must be one of the IPv4 addresses at the switch IPv4
interfaces.
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