Cisco SR224T Administration Guide - Page 215

Configuring IP Information Management and IP Interfaces 16 Configuring IPv6 Tunnels The ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) enables encapsulating IPv6 packets within IPv4 packets for transmission over IPv4 networks. To configure a tunnel, do the following: • Manually enable and configure an ISATAP tunnel. • Manually define an IPv6 interface for the ISATAP tunnel. After these actions, the switch automatically configures the linklocal 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: STEP 1 Click Administration > Management Interface > IPv6 Tunnel. The IPv6 Tunnel page opens. STEP 2 Enter 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. Cisco Small Business 200 Series Smart Switch Administration Guide 216