I looked in the LuCI interface and it seems all OK.
The /etc/config/network has:
config interface 'wan'
option ifname 'eth1.101'
option proto 'dhcp'
The /etc/config/firewall has:
config zone
option name 'wan'
list network 'wan'
list network 'wan6'
option input 'REJECT'
option output 'ACCEPT'
option forward 'REJECT'
option masq '1'
option mtu_fix '1'
config forwarding
option src 'lan'
option dest 'wan'