Using network-scripts with Redhat

Initially, IPv6 functionality should be enabled on the RedHat host (see Appendix B). Furthermore, in order to set up a 6to4 tunnel, one has to follow the next steps:

1. In the /etc/syconfig/network-scripts/ifcfg-eth0 file include:

IPV6TO4INIT=yes

which forces the system to initialize a tunnel (sit1) using the configuration defined in the file "ifcfg-sit1".

2. Modify the /etc/sysconfig/ifcfg-sit1 file as follows:

The above settings will create a 6to4 tunnel pointing to a 6to4 relay router. In the above configuration, x.y.z.w is the IPv4 address of a 6to4 relay router and 2002:<IPv4 address as hex>::<IPv4 address as hex> is the local 6to4 IPv6 address of the host. Note that the IPv6 address, e.g. 2002:aabb:ccdd::aabb:ccdd, is followed by a "/0" suffix in order to force the creation of a default route for all the 6to4 traffic through the sit1 tunnel.

In the file /etc/sysconfig/network include the following line:

IPV6_GATEWAYDEV=sit1

This sets the 6to4 tunnel interface sit1 as the default gateway for all IPv6 traffic.