====== IPv6 ======

===== SixXS =====
  * Handle: BRR3-SIXXS

===== Setting up the gateway =====
Add the following to the network configuration:
{{File|/etc/conf.d/net|<syntax lang="gentoo-conf-d">
config_br0="2a01:348:1b6:0::1/64"
config_br1="2a01:348:1b6:1::1/64"

depend_sixxs() {
    need net.br0
}
iptunnel_sixxs="mode sit remote 77.75.104.126 local 78.86.202.93 ttl 64 dev br0"
mtu_sixxs="1280"
config_sixxs="2a01:348:6:1d4::2/64"
routes_sixxs="2000::/3 via 2a01:348:6:1d4::1"
</syntax>}}

Create an init script for the sixxs tunnel, start it, and have it run on boot:
{{Root|<source lang="bash">
cd /etc/init.d
ln -s net.lo net.sixxs
/etc/init.d/net.sixxs start
rc-update add net.sixxs default
</source>}}

==== Firewall ====
Iptables only works on IPv4, so we will also need an IPv6 firewall, which is handled by <tt>ip6tables</tt> (installed with the {{Package|direct=yes|net-firewall/iptables}} package, when the {{USEFlag|{{EnableFlag|ipv6}}}} USE flag is enabled).

Create an empty ruleset with:
{{Root|<source lang="bash">
ip6tables-save > ip6tables.sixxs
</source>}}

Edit the file, and then run the following commands to install the rules, and ensure the firewall starts up on boot:
{{Root|<source lang="bash">
iptables-restore ip6tables.sixxs
/etc/init.d/ip6tables save
/etc/init.d/ip6tables start
rc-update add ip6tables default
</source>}}

==== Router Advertisements ====
Install the Router Advertisement Daemon, which announces the subnet prefix for local machines to use when using stateless autoconfiguration:
  * {{Package|direct=yes|net-misc/radvd}}

Set up <tt>radvd.conf</tt> with the local configuration:
{{File|/etc/radvd.conf|<syntax lang="conf">
interface br0 {
    AdvSendAdvert off;
};

interface br1 {
    AdvSendAdvert on;
    AdvLinkMTU 1280;
    MaxRtrAdvInterval 300;

    prefix 2a01:348:1b6:1::/64 {
        AdvOnLink on;
        AdvAutonomous on;
    };
};

#interface eth3 {
  -   AdvSendAdvert on;
  -   AdvLinkMTU 1280;
  -   MaxRtrAdvInterval 300;
#
  -   prefix 2a01:348:1b6:2::/64 {
  -       AdvOnLink on;
  -       AdvAutonomous on;
  -   };
#};
</syntax>}}

Then start the service, and ensure it is stared on every boot:
{{Root|<source lang="bash">
/etc/init.d/radvd start
rc-update add radvd default
</source>}}