Tunneling Ipv6 Over Ipv4 - OmniSwitch os6900 Network Configuration Manual

Configuring IPv6

Tunneling IPv6 over IPv4

It is likely that IPv6 and IPv4 network infrastructures will coexist for some time, if not indefinitely.
Tunneling provides a mechanism for transitioning an IPv4 network to IPv6 and/or maintaining interopera-
bility between IPv4 and IPv6 networks. This implementation of IPv6 supports tunneling of IPv6 traffic
over IPv4. There are two types of tunnels supported, 6to4 and configured.
Note. Dynamic routing protocols are not supported over 6to4 tunnels. However, it is possible to configure
dynamic routing for a configured tunnel. See
more information.
6to4 Tunnels
6to4 tunneling provides a mechanism for transporting IPv6 host traffic over an IPv4 network infrastruc-
ture to other IPv6 hosts and/or domains without having to configure explicit tunnel endpoints. Instead, an
IPv6 6to4 tunnel interface is created at points in the network where IPv6 packets are encapsulated (IPv4
header added) prior to transmission over the IPv4 network or decapsulated (IPv4 header stripped) for
transmission to an IPv6 destination.
An IPv6 6to4 tunnel interface is identified by its assigned address, which is derived by combining a 6to4
well-known prefix (2002) with a globally unique IPv4 address and embedded as the first 48 bits of an IPv6
address. For example, 2002:d467:8a89::137/64, where d467:8a89 is the hex equivalent of the IPv4 address
212.103.138.137.
6to4 tunnel interfaces are configured on routers and identify a 6to4 site. Because 6to4 tunnels are point-to-
multi-point in nature, any one 6to4 router can communicate with one or more other 6to4 routers across the
IPv4 cloud. Additionally, IPv6 multicast traffic cannot be forwarded over a 6to4 tunnel. Two common
scenarios for using 6to4 tunnels are described below.
6to4 Site to 6to4 Site over IPv4 Domain
In this scenario, isolated IPv6 sites have connectivity over an IPv4 network through 6to4 border routers.
An IPv6 6to4 tunnel interface is configured on each border router and assigned an IPv6 address with the
6to4 well-known prefix, as described above. IPv6 hosts serviced by the 6to4 border router have at least
one IPv6 router interface configured with a 6to4 address. Note that additional IPv6 interfaces or external
IPv6 routing protocols are not required on the 6to4 border router.
OmniSwitch AOS Release 7 Network Configuration Guide
"Configuring IPv6 Tunnel Interfaces" on page 17-18
June 2013
IPv6 Overview
for
page 17-11