Block RU Chia nodes

# Block incoming connections from Russian IPs to your Chia node using iptables and ipset.
# Adapted from https://mtxserv.com/vps-server/doc/how-to-block-ip-addresses-by-country
# Execute as root or using sudo.

# 1. Install ipset:
apt install ipset
# or
yum install ipset

# 2. Create a new ipset called "ru".
ipset create ru hash:net,port

# 3. Create a file with the following contents, make it executable:
#!/bin/bash

COUNTRIES=('ru')

ipset flush ru

for i in "${COUNTRIES[@]}"; do
    echo "Ban IP of country ${i}"

    for IP in $(wget -O - https://www.ipdeny.com/ipblocks/data/countries/${i}.zone)
    do
        ipset add ru $IP,8444
    done
done

# 4. Execute the file you have just created to fill the ipset, it should take only a few seconds.

# 5. And finally, create an iptables entry to put the new ipset to work.
iptables -I INPUT -m set --match-set ru src -j DROP