root@xcp-gateway:~# radvdump
#
# radvd configuration generated by radvdump 2.15
# based on Router Advertisement from fe80::201:5cff:fe79:e247
# received by interface eth0
#

interface eth0
{
        AdvSendAdvert on;
        # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
        AdvManagedFlag on;
        AdvOtherConfigFlag on;
        AdvReachableTime 3600000;
        AdvRetransTimer 0;
        AdvCurHopLimit 0;
        AdvDefaultLifetime 9000;
        AdvHomeAgentFlag off;
        AdvDefaultPreference medium;

        prefix xxx:yyy:zzz::/64
        {
                AdvValidLifetime 2592000;
                AdvPreferredLifetime 604800;
                AdvOnLink on;
                AdvAutonomous off;
                AdvRouterAddr off;
        }; # End of prefix definition

}; # End of interface definition