Docker OpenWrt no internet access

README.md

Problem to Solve:

Host want to use OpenWrt as gateway to pass wall.

• My router IP: 192.168.31.1
• My host IP: 192.168.31.2
• OpenWrt container IP: 192.168.31.3

rc-local.service

# File path: /etc/systemd/system/rc-local.service

[Unit]
Description=/etc/rc.local Compatibility
ConditionPathExists=/etc/rc.local

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

rc.local

# File path: /etc/rc.local

# 1. Create a new macvlan interface
ip link add link enp2s0 mynet type macvlan mode bridge

# 2. Set the IP address
ip addr add 192.168.31.4 dev mynet
ip link set mynet up

# 3. Add route to OpenWrt, after this step, you will be able to ping 192.168.31.3 from the host.
ip route add 192.168.31.3 dev mynet

# 4. Replace with OpenWrt as the default gateway, after this step, you will be able to pass wall from the host. ;)
ip route del default
ip route add default via 192.168.31.3 dev mynet