IPv6 tunneling and NAT64(CCNP)

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Static point-to-point IPv6 tunnels

- point to point

- support IPv6 IGP over tunnel

!

interface Tunnel0

no ip address

ipv6 address 2001:33::3/64

ipv6 ospf 1 area 0

keepalive 10 3

tunnel source FastEthernet0/1

tunnel destination 10.0.15.5

tunnel mode ipv6ip

end

!

-

Dynamic mulitpoint ipv6 tunnels

- point to multipoint

- do not support ipv6 IGP, so we need static routes or mBGP

-

a) Automatic 6to4 tunnels:

-treats the underlying IPv4 network as one big non-broadcast multiaccess

(NBMA) network, rather than a collection of independent point-to-point

links.

- uses 2002::/16: not globally routed

-

b) ISATAP

NAT64

- if v6 only host needs to communicate to v4 only host.

-

Two flavors:

a) Stateless:

- do it and forget.

- ipV4 address of destination embedded in ipv6 address

- ipv6 host IP should be static

- allow bidrectional reachability

NAT-PT

http://blog.ine.com/2008/04/18/understanding-ipv6-nat-pt/