essaie ça :
config interface 'loopback'
option device 'lo'
option proto 'static'
list ipaddr '127.0.0.1/8'
config globals 'globals'
option dhcp_default_duid '000491a04ffa73d643549fab5e659eac0654'
option ula_prefix 'fd58:2c44:c12e::/48'
option packet_steering '1'
config device
option name 'br-lan'
option type 'bridge'
list ports 'port2'
list ports 'port3'
list ports 'port4'
list ports 'port5'
list ports 'port6'
config device
option name 'port1'
option macaddr 'B0:19:21:B7:6A:6F'
config device
option name 'port2'
option macaddr 'B0:19:21:b7:6a:6E'
config device
option name 'port3'
option macaddr 'B0:19:21:B7:6A:6E'
config device
option name 'port4'
option macaddr 'B0:19:21:B7:6A:6E'
config device
option name 'port5'
option macaddr 'B0:19:21:B7:6A:6E'
config device
option name 'port6'
option macaddr 'B0:19:21:B7:6A:6E'
config interface 'lan'
option device 'br-lan'
option proto 'static'
list ipaddr '192.168.1.1/24'
option ip6assign '60'
config interface 'wan'
option device 'port1'
option proto 'dhcp'
option multipath 'off'
option hostname '*'
option vendorid 'neufbox'
config interface 'wan6'
option device 'port1'
option proto 'dhcpv6'
option defaultreqopts '0'
option reqopts '23 25 26'
option reqaddress 'try'
option reqprefix 'auto'
option noclientfqdn '1'
option noacceptreconfig '1'
Remplacer la box SFR par un routeur