IPV6 over IPV4 Tunneling Notes
IPv6 over IPv4 Tunneling
R1
– Source: 12.0.0.1
– Destination: 23.0.0.3
R3
– Source: 23.0.0.3
– Destination: 12.0.0.1
Static tunnel
– point-to-point tunnel
– IPv6IP
-> IPv6 payload only
-> Smaller header
-> IP protocol 41
– GRE IP
-> Multiprotocol support
-> Larger header
-> IP protocol 47
During the troubleshooting section of the R&S lab, there may be an ACL blocking IP protocol 41 or 47
R1(config)# int tu0
ip add 2001::1/64
tunnel source 12.0.0.1
tunnel destination 23.0.0.3
tunnel mode ipv6ip
-> The tunnel mode will be GRE, by default, if the tunnel mode is not specified