Netgear M7100-24X (XSM7224) - ProSAFE 24 Ports 10G Fully Managed L2 Switch Guia Do Administrador
Tunnels for IPv6
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Managed Switches
Tunnel Concepts
Two methods exist for IPv6 sites to communicate with each other over the IPv4 network: 6in4
tunnel and 6to4 tunnel. The 6in4 tunnel encapsulates IPv6 traffic over an explicitly configured
IPv4 destination or end port of the tunnel with the IP protocol number set to 41. The 6to4
tunnel IPv6 prefix is constructed by prepending 2002 (hexadecimal) to the global IPv4
address. For example, if the IPv4 address is 4.4.4.1, the tunnel IPv6 prefix would be
2002:404:401::/16.
tunnel and 6to4 tunnel. The 6in4 tunnel encapsulates IPv6 traffic over an explicitly configured
IPv4 destination or end port of the tunnel with the IP protocol number set to 41. The 6to4
tunnel IPv6 prefix is constructed by prepending 2002 (hexadecimal) to the global IPv4
address. For example, if the IPv4 address is 4.4.4.1, the tunnel IPv6 prefix would be
2002:404:401::/16.
The 6to4 tunnels are automatically formed IPv4 tunnels carrying IPv6 traffic. The automatic
tunnel’s IPv4 destination address is derived from the 6to4 IPv6 address of the tunnel’s next
hop. A 6to4 tunnel supports the functionality of a 6to4 border router that connects a 6to4 site
to a 6to4 domain. With 6to4 tunnels, routers in a 6to4 domain, including other 6to4 border
routers and 6to4 relay routers, can send and receive tunneled traffic from each other.
tunnel’s IPv4 destination address is derived from the 6to4 IPv6 address of the tunnel’s next
hop. A 6to4 tunnel supports the functionality of a 6to4 border router that connects a 6to4 site
to a 6to4 domain. With 6to4 tunnels, routers in a 6to4 domain, including other 6to4 border
routers and 6to4 relay routers, can send and receive tunneled traffic from each other.
Create a 6in4 Tunnel
In the example, you create a 6in4 tunnel between Switch 1 and Switch 2. The tunnel carries
IPv6 packets over IPv4 packets.
IPv6 packets over IPv4 packets.
IPv4 Network
Switch 1
Switch 2
1/0/1
1/0/13
Figure 56. 6in4 tunnel configuration