removed ipv6 config

root@cepallo:~# ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN qlen 1000
    link/ether 4?:??:??:??:??:?? brd ff:ff:ff:ff:ff:ff
3: ra0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP qlen 1000
    link/ether 4?:??:??:??:??:?? brd ff:ff:ff:ff:ff:ff
    inet 192.168.18.1/24 brd 192.168.18.255 scope global ra0
       valid_lft forever preferred_lft forever
    inet6 fe??::????:????:????:????/64 scope link
       valid_lft forever preferred_lft forever
4: apcli0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN qlen 1000
    link/ether 4?:??:??:??:??:?? brd ff:ff:ff:ff:ff:ff

:%s/4.:..:..:..:..:../4?:??:??:??:??:??/gc

network

@@ -4,15 +4,11 @@ config interface 'loopback'
         option ipaddr '127.0.0.1'
         option netmask '255.0.0.0'
 
-config globals 'globals'
-        option ula_prefix 'fd1d:48c4:7633::/48'
-
 config interface 'wlan'
         option ifname 'ra0'
         option proto 'static'
         option ipaddr '192.168.18.1'
         option netmask '255.255.255.0'
-        option ip6assign '60'
 
 config interface 'wwan'
         option ifname 'apcli0'