FAQ : Connectivity (Tunnels and Subnets) : How do I configure my machine to setup the IPv6 in IPv4 tunnel to the SixXS PoP?

How do I configure my machine to setup the IPv6 in IPv4 tunnel to the SixXS PoP?

The easiest way is by using AICCU, though if one wants to configure it manually or because AICCU doesn't support your platform, then you can pick your Operating system from the following list. AICCU can configure static, heartbeat and AYIYA tunnels.

Warning The manual methods described below only apply to static proto-41 tunnels. AYIYA and heartbeat tunnels require AICCU.

Cisco (IOS)

IOS Setup is plain and easy: !
ipv6 unicast-routing
interface tunnel0
  description IPv6 uplink to SixXS
  no ip address
  ipv6 enable
  ipv6 nd suppress-ra (<12.4)
  ipv6 nd ra suppress (>=12.4)
  ipv6 address [Your IPv6 Endpoint]/[Prefix Length]
  ipv6 mtu 1280 (or other MTU value, depending on what you configured the tunnel to)
  tunnel source [Your IPv4 Endpoint]
  tunnel destination [PoP IPv4 Endpoint]
  tunnel mode ipv6ip
!
ipv6 route 2000::/3 [PoP IPv6 Endpoint]

Cisco URL's:
Q&A: Cisco IOS Software Solutions: IPv6