server.conf

log-level 8
inactive-mode

iface tun0 {
        class {
                pool 2001:67c:20a0:b112::/64
        }

        pd-class{
                # network        2001:67c:20a0:b1c0::/58
                # network range  2001:067c:20a0:b1c0:0000:0000:0000:0000-2001:067c:20a0:b1ff:ffff:ffff:ffff:ffff
                # 4 networks /60
        
                pd-pool 2001:67c:20a0:b1c0::/58
                pd-length 60
        }
}

iface ppp0 {
        class {
                pool 2001:67c:20a0:b120::/64
        }

        pd-class {
                pd-pool 2001:067c:20a0:b180::/60
                pd-length 60
        }

} 

iface ppp1 {
        class {
                pool 2001:67c:20a0:b121::/64
        }
        
        pd-class {
                pd-pool 2001:067c:20a0:b190::/60
                pd-length 60
        }

}

iface ppp2 {
        class { 
                pool 2001:67c:20a0:b122::/64
        }

        pd-class {
                pd-pool 2001:067c:20a0:b1a0::/60
                pd-length 60
        }

}
iface ppp3 {
        class {
                pool 2001:67c:20a0:b123::/64
        }

        pd-class {
                pd-pool 2001:067c:20a0:b1b0::/60
                pd-length 60
        }

}