This is working setting for IPv6 unifi.
I uses route announcements (RA) so that the home router configures the default route as well as a /64 prefix for auto-configuration. We don't need the /64, but it can be useful for the default route.
For PPP on a router, this is disabled by default.
To enable the default route from route advertisements:
# sysctl -w net.ipv6.conf.ppp0.accept_ra=2
To auto-configure an IP address to ppp0:
# sysctl -w net.ipv6.conf.ppp0.autoconf=1
After a few seconds, "ifconfig ppp0" should show a global IPv6 address, and "ip -6 route" will show a default route. You should also be able to "ping6 google.com" or he.net from your router.
IMPORTANT: to make sysctl configurations permanent, you can try to add them to /etc/sysctl.conf, or to /etc/ppp/ipv6-up.d/my-network (script executed when the ppp connection is enabled).
Configuring the /56 prefix with DHCPv6-PD
A /64 network prefix is recommend for a single network. However, most IPv6 home topologies need more than one network. For example, the wireless access point (AP) should use its own network (bye bye network bridging), the wired network another network, another for home servers, appliances, etc.
Install the 'WIDE DHCPv6 client':
# apt-get install wide-dhcpv6-client
The Debian configuration wizard may ask for which interface to listen on: ppp0.
Sample configuration in /etc/wide-dhcpv6/dhcp6c.conf :
# c.f. http://www.ipcalypse.ca/?p=204
interface ppp0 {
# Identity Association for Prefix Delegation
send ia-pd 1;
# Identity Association for Non-temporary Addresses
send ia-na 1;
# request domain-name-servers;
# request domain-name;
# script "/etc/wide-dhcpv6/dhcp6c-script";
};
id-assoc pd 1 {
prefix-interface eth1 {
# Assign subnet 1 to eth1
sla-id 1;
# IP address "postfix". if not set it will use EUI-64 address of the interface.
# Combined with SLA-ID'd prefix to create full IP address of interface.
ifid 1;
# Prefix bits assigned.
# Take the prefix size you're assigned (/48 or /56) and subtract it from 64.
# In my case I was being assigned a /56, so 64-56=8
sla-len 8;
};
};
id-assoc na 1 {
};
Test from the command line:
# dhcp6c -fD -c /etc/wide-dhcpv6/dhcp6c.conf ppp0
Configure radvd for auto-configuration on the networks
Each network with clients (desktops/workstations/laptops) will need radvd so that the clients can auto-configure themselves.
Install radvd:
# apt-get install radvd
Example configuration for a subnet, in /etc/radvd.conf :
interface eth1
{
AdvSendAdvert on;
MaxRtrAdvInterval 30;
prefix ::/64
{
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr off;
AdvValidLifetime 300;
AdvPreferredLifetime 120;
};
};
Then restart radvd:
# services radvd restart
