6to4 automatic tunneling overview and config-example

13.12 2019 | by massimiliano

Le caratteristiche del 6to4 tunneling sono: – Point to Multipoint design; – Connecting between IPv6 hosts throught IPv4 network/cloud […]

https://www.ingegnerianetworking.com/wp-content/uploads/2019/12/6t4-format-215.png

Le caratteristiche del 6to4 tunneling sono:

– Point to Multipoint design;
– Connecting between IPv6 hosts throught IPv4 network/cloud NBMA;
– Tunnel operates per packet-basis to encapsulation to destination address by combining the ipv6 prefix with the globally unique destination 6to4 border routers ipv4 address;
– Tunnel mode: ipv6ip 6t4;
– The destinations address are automatically determined;
– Range IPv6 address: 2002::/16 reserved only for tunneling

6t4 format

ARCHITETTURA DI RIFERIMENTO:

arch 6t4 example

6t4 Config:

R1# (la configurazione di R2 ed R3 è identica cambiando gli indirizzi delle interfacce)

interface fa0/0

descripton subnet-IPv6

no ip address

ipv6 address 2002:c0a8:1::1/64

interface gi0/0

description IPv4-address

ip address 192.168.0.1 255.255.255.252

ipv6 general-prefix MYIPv6 gigabitethernet 0/0 # se si vuole ottenere in modo automatico un indirizzo ipv6 from ipv4

interface tunnel 0

description 6t4-tunnel

no ip address

ipv6 address 2002:c0a8:1::1/64

tunnel source gi0/0

tunnel mode ipv6ip 6to4

ipv6 route 2002::/16 tunnel 0 # le destinazioni sono automaticamente determinate