Ubuntu IPv6

Enabling/Disabling IPv6

In flight

Note

Enabling or disabling IPv6 this way is only in effect until next boot.

Disabling

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1
sysctl -w net.ipv6.conf.lo.disable_ipv6=1

Enabling

sysctl -w net.ipv6.conf.all.disable_ipv6=0
sysctl -w net.ipv6.conf.default.disable_ipv6=0
sysctl -w net.ipv6.conf.lo.disable_ipv6=0

Manually adding an IPv6 Address

ifconfig eth0 add 2001:16d8:dd85:139::50/64

Static configuration

Example of configuration of IPv6 on eth1 in /etc/network/interfaces

iface eth1 inet6 static
 pre-up modprobe ipv6
 address 2001:0470:51dc:1::1
 netmask 64

Disable permanent

Add the following lines to /etc/sysctl.conf.

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

Configure as IPv6 Router

Uncomment the line net.ipv6.conf.all.forwarding=1 in /etc/sysctl.conf and reboot

Install Route Advertisement daemon for IPv6

sudo apt-get install radvd

Configure radvd

Example configuration of /etc/radvd.conf shown below. (See /usr/share/doc/radvd/examples)

interface eth1
{
        AdvSendAdvert on;
        prefix 2001:470:51dc:1::/64
        {
                AdvOnLink on;
                AdvAutonomous on;
        };
};

DHCP Other-Config flag

interface eth1
{
        AdvSendAdvert on;
        <notice>AdvOtherConfigFlag on;</notice>
        prefix 2001:470:51dc:1::/64
        {
                AdvOnLink on;
                #//MaxRtrAdvInterval 10;
                AdvAutonomous on;
        };
};

Links

• Ubuntu IPv6