ROUTE 041 - IPv6 Automatic 6to4 Tunnels

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


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.



Ali Shariaty

Point-to-Multipoint IPv6 Tunnels Logic



Ali Shariaty

Point-to-Multipoint IPv6 Tunnels Types

• Automatic 6to4 tunnels

• ISATAP tunnels



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.



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.



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>



Ali Shariaty

Configuring the Automatic 6to4 Tunnel

LAB Scenario



Ali Shariaty



Ali Shariaty

Using Global Unicasts with Automatic Tunnels



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



Ali Shariaty

ROUTE 041 - IPv6 Automatic 6to4 Tunnels

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