Whitelist iptables (한국 외 국가 접근 차단)
1. GeoIPCountryWhois.csv 구하기 $ grep KR GeoIPCountryWhois.csv | head "1.11.0.0","1.11.255.255","17498112","17563647","KR","Korea, Republic of" "1.16.0.0","1.19.255.255","17825792","18087935","KR","Korea, Republic of" "1.96.0.0","1.111.255.255","23068672","24117247","KR","Korea, Republic of" "1.176.0.0","1.177.255.255","28311552","28442623","KR","Korea, Republic of" "1.201.0.0","1.201.255.255","29..
2021.12.23