IPv6 Tunneling

~ P2P IPv6 Tunnels ~


Manual

Tunnel source  / destination should be an IPv4 address.

Tunnel IP should be an IPv6 address.

Tunnel mode IPv6IP

Manual GRE

Tunnel source  / destination should be an IPv6 address.

Tunnel IP should be an IPv6 address.

Tunnel Mode GRE IPv6


~ P2MultiPoint IPv6 Tunnels ~


Automatic 6-4


Used for IPv6 Source / Destination over an IPv4 Network.

Sites use 2002::/16 prefix -- Format 2002:border_router_ipv4_address::/48

Tunnel Source IPv4 address / No tunnel destination required

Tunnel IP address is IPv6 address

Tunnel mode IPv6IP 6to4

ipv6 route 2002::/16 tunnel 0

ISATAP (Intra-site automatic tunnel addressing protocol) 


You can use any IPv6 address that you desire unlike auto 6-4. Used for transporting IPv6 within a site, not between.

Interface ID is created using EUI-64 address which is embeeded in last 32 bit of the IPv6 address. e.g. mac_add-FFFE-mac_address

Tunnel IPv6 2001:1234::/64 EUI-64

Tunnel mode IPv6IP ISATAP

Need to add "no ipv6 ND ra-suppress" / "no ipv6 nd suppress-ra