Tips
Get wan IP
https://blog.csdn.net/walker0411/article/details/51996052
root@OpenWrt:/# ip route show
default via 192.168.3.1 dev wlan1
192.168.1.0/24 dev br-lan proto kernel scope link src 192.168.1.1
192.168.3.0/24 dev wlan1 proto kernel scope link src 192.168.3.65
239.0.0.0/8 dev br-lan scope link
239.255.255.250 dev br-lan scope link
root@OpenWrt:/# ip route show | grep "dev wlan1 proto kernel scope link"
192.168.3.0/24 dev wlan1 proto kernel scope link src 192.168.3.65
root@OpenWrt:/# ip route show | grep "dev wlan1 proto kernel scope link" | cu
t -d ' ' -f12
192.168.3.65
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