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Instructor: Ali Shariatywww.alishariaty.ir
www.rayka-co.ir
IPv6
Automatic 6to4 tunnels
In This Video
• Point-to-Multipoint IPv6 Tunnels Overview
• Point-to-Multipoint IPv6 Tunnels Logic
• Point-to-Multipoint IPv6 Tunnels Types
• Automatic 6to4 tunnels Concepts
• Configuring the Automatic 6to4 Tunnel
• Using Global Unicasts with Automatic Tunnels
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Point-to-Multipoint IPv6 Tunnels Overview
• Multipoint tunnels benefits over Point-to-point tunnels
• Possibility of joining new sites can join into the tunnel without
requiring additional configuration on the existing routers.
• Multipoint IPv6 tunnels use a single tunnel interface to send packets to
multiple remote routers.
• Point-to-point tunnels benefits over Multipoint tunnels
• IPv6 address planning must follow some additional rules and
constraints.
• These tunnels also do not support IPv6 IGPs, requiring the use of either
static routes or multiprotocol BGP.
• The dynamic forwarding logic requires more work per packet as
compared with point-to-point tunnels, which is one of the main
reasons multipoint tunnels are best used for less frequent traffic, with
point-to-point tunnels best used for more frequent traffic.
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Point-to-Multipoint IPv6 Tunnels Logic
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Point-to-Multipoint IPv6 Tunnels Types
• Automatic 6to4 tunnels
• ISATAP tunnels
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Automatic 6to4 tunnels Concepts
• A multipoint tunnel does not explicitly define the tunnel endpoint IPv4
addresses.
• The engineers should use a special reserved range of addresses (2002::/16)
in the enterprise.
• If the Enterprise needs to use its registered global unicast site prefix,
automatic 6to4 tunnels can still be used, just with a little more configuration
effort over time.
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Automatic 6to4 tunnels Concepts
• To trigger the dynamic encapsulation process for the tunnel, the routers
must route IPv6 traffic out the tunnel interface. The engineer plans a static
route forwarding all packets destined for these special 2002::/16 addresses
out the multipoint tunnel interface.
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Configuring the Automatic 6to4 Tunnel
Router(config)# ipv6 unicast-routing
If using a new loopback interface, create the loopback
Router(config)# interface loopback <number>
Router(config)# interface tunnel <number>
Router(config-if)# tunnel source <interface | ipv4 address>
Do NOT define a tunnel destination.
Router(config-if)# tunnel mode ipv6ip 6to4
Router(config)# ipv6 route 2002::/16 tunnel <number>
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Configuring the Automatic 6to4 Tunnel
LAB Scenario
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Using Global Unicasts with Automatic Tunnels
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty
Using Global Unicasts with Automatic Tunnels
LAB Scenario
Review
• Point-to-Multipoint IPv6 Tunnels Overview
• Point-to-Multipoint IPv6 Tunnels Logic
• Point-to-Multipoint IPv6 Tunnels Types
• Automatic 6to4 tunnels Concepts
• Configuring the Automatic 6to4 Tunnel
• Using Global Unicasts with Automatic Tunnels
Automatic 6to4 tunnels
www.alishariaty.irwww.rayka-co.ir
Ali Shariaty