Configuring dhcpv6 from ISP

Installing and Using OpenWrt Network and Wireless Configuration
5

here's my /etc/config/network file:

config interface 'loopback'
        option device 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd13:8bcb:23b2::/48'

config device
        option name 'br-lan'
        option type 'bridge'
        list ports 'lan1'
        list ports 'lan2'
        list ports 'lan3'
        list ports 'lan4'

config interface 'lan'
        option device 'br-lan'
        option proto 'static'
        option ipaddr '10.5.5.1'
        option netmask '255.255.255.0'
        option ip6assign '64'

config device
        option name 'wan'
        option macaddr '62:38:e0:d7:3a:03'

config interface 'wan'
        option device 'wan'
        option proto 'dhcp'
        option peerdns '0'
        list dns '1.1.1.1'
        list dns '1.0.0.1'
        list dns '8.8.8.8'
        list dns '8.4.4.8'
        list dns '208.67.220.220'
        list dns '208.67.222.222'
        option hostname '*'
        option delegate '0'

config interface 'wan6'
        option device 'wan'
        option proto 'dhcpv6'
        option reqprefix '56'
        option ip6assign '64'
        option reqaddress 'try'