https://blog.phpgao.com/carzy_router.html 自动更新 每天凌晨4点更新文件,注意文件路径 拿到中国ip 0 4 * * * curl 'http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest' | grep ipv4 | grep CN | awk -F| '{ printf("%s/%d\n", $4, 32-log($5)/log(2)) }' > /etc/chinadns_chnroute.txt