Disable IPV6 on Flint2

Technical Support for Routers
9

LuCI → Network → Interfaces. Edit WWAN6, WAN6, LAN. Disable Bring up on boot, Request IPv6-address within General Settings. Disable all IPv6 related under the Advanced Settings.

If you’re comfortable editing the network conf directly (see attached HOW-TO):

root@slateax:~# cat /etc/config/network

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 '[redacted]::/48'

config device
        option name 'br-lan'
        option type 'bridge'
        list ports 'eth1'
        list ports 'eth2'
        option ipv6 '0'

config device
        option name 'eth1'
        option macaddr '[redacted]'
        option ipv6 '0'

config device
        option name 'eth2'
        option macaddr '[redacted]'
        option ipv6 '0'

config interface 'lan'
        option device 'br-lan'
        option proto 'static'
        option ipaddr '192.168.8.1'
        option netmask '255.255.255.0'
        option ip6assign '60'
        option isolate '0'

config device
        option name 'eth0'
        option macaddr '[redacted]'
        option ipv6 '0'

config interface 'wan'
        option device 'eth0'
        option proto 'dhcp'
        option force_link '0'
        option ipv6 '0'
        option metric '10'
        option peerdns '0'

config interface 'wan6'
        option proto 'dhcpv6'
        option disabled '1'
        option device '@wan'
        option reqprefix 'auto'
        option reqaddress 'none'
        option auto '0'
        option peerdns '0'

config switch
        option name 'switch0'
        option reset '0'
        option enable_vlan '0'

config interface 'tethering6'
        option proto 'dhcpv6'
        option disabled '1'
        option device '@tethering'

config interface 'wwan6'
        option proto 'dhcpv6'
        option disabled '1'
        option device '@wwan'
        option reqprefix 'auto'
        option reqaddress 'none'
        option auto '0'

config interface 'guest'
        option force_link '1'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.9.1'
        option netmask '255.255.255.0'
        option ip6assign '60'
        option multicast_querier '1'
        option igmp_snooping '0'
        option isolate '0'
        option bridge_empty '1'
        option disabled '1'

config interface 'wwan'
        option proto 'dhcp'

config rule 'policy_bypass_vpn'
        option mark '0x60000/0x60000'
        option lookup '53'
        option priority '53'

config rule 'policy_via_vpn'
        option mark '0x80000/0x80000'
        option lookup '52'
        option priority '52'

config rule 'policy_dns'
        option mark '0x100000/0x100000'
        option lookup '51'
        option priority '51'

config interface 'wgclient'
        option proto 'wgclient'
        option config 'peer_2005'
        option disabled '0'

config interface 'modem_1_1_2_6'
        option proto 'dhcpv6'
        option disabled '1'
        option device '@modem_1_1_2'

config device
        option name 'wgclient'
        option ipv6 '0'

config device
        option name 'wlan0'
        option ipv6 '0'

config device
        option name 'wlan0-1'
        option ipv6 '0'

config device
        option name 'bond0'
        option ipv6 '0'

config device
        option name 'bonding_masters'
        option ipv6 '0'

firmware 4.4.6-release1

Then make a backup; reboot.