Novell LINUX ENTERPRISE SERVER 11 - ADMINISTRATION Administration Manual page 227

However, the configuration and maintenance of static tunnels is often too labor-intensive
to use them for daily communication needs. Therefore, IPv6 provides for three different
methods of dynamic tunneling:
6over4
IPv6 packets are automatically encapsulated as IPv4 packets and sent over an IPv4
network capable of multicasting. IPv6 is tricked into seeing the whole network
(Internet) as a huge local area network (LAN). This makes it possible to determine
the receiving end of the IPv4 tunnel automatically. However, this method does not
scale very well and is also hampered by the fact that IP multicasting is far from
widespread on the Internet. Therefore, it only provides a solution for smaller cor-
porate or institutional networks where multicasting can be enabled. The specifica-
tions for this method are laid down in RFC 2529.
6to4
With this method, IPv4 addresses are automatically generated from IPv6 addresses,
enabling isolated IPv6 hosts to communicate over an IPv4 network. However, a
number of problems have been reported regarding the communication between
those isolated IPv6 hosts and the Internet. The method is described in RFC 3056.
IPv6 Tunnel Broker
This method relies on special servers that provide dedicated tunnels for IPv6 hosts.
It is described in RFC 3053.
17.2.4 Configuring IPv6
To configure IPv6, you normally do not need to make any changes on the individual
workstations. IPv6 is enabled by default. You can disable it during installation in the
network configuration step described in Section "Network Configuration" (Chapter 6,
Installation with YaST, ↑Deployment Guide). To disable or enable IPv6 on an installed
system, use the YaST Network Settings module. On the Global Options tab, check or
uncheck the Enable IPv6 option as necessary. To enable IPv6 manually, enter
modprobe ipv6 as root.
Because of the autoconfiguration concept of IPv6, the network card is assigned an ad-
dress in the link-local network. Normally, no routing table management takes place on
a workstation. The network routers can be queried by the workstation, using the router
advertisement protocol, for what prefix and gateways should be implemented. The
radvd program can be used to set up an IPv6 router. This program informs the worksta-
Basic Networking 213