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DDWRT administrator page > Administration Tab > Commands > Paste following inside Command Shell.
iptables -I FORWARD -s 102.132.96.0/20 -j REJECT
iptables -I FORWARD -s 102.132.96.0/24 -j REJECT
iptables -I FORWARD -s 103.4.96.0/22 -j REJECT
iptables -I FORWARD -s 129.134.0.0/17 -j REJECT
iptables -I FORWARD -s 129.134.25.0/24 -j REJECT
iptables -I FORWARD -s 129.134.26.0/24 -j REJECT
iptables -I FORWARD -s 129.134.27.0/24 -j REJECT
iptables -I FORWARD -s 129.134.28.0/24 -j REJECT
iptables -I FORWARD -s 129.134.29.0/24 -j REJECT
iptables -I FORWARD -s 129.134.30.0/23 -j REJECT
iptables -I FORWARD -s 129.134.30.0/24 -j REJECT
iptables -I FORWARD -s 129.134.31.0/24 -j REJECT
iptables -I FORWARD -s 129.134.64.0/24 -j REJECT
iptables -I FORWARD -s 129.134.65.0/24 -j REJECT
iptables -I FORWARD -s 129.134.66.0/24 -j REJECT
iptables -I FORWARD -s 129.134.67.0/24 -j REJECT
iptables -I FORWARD -s 129.134.68.0/24 -j REJECT
iptables -I FORWARD -s 129.134.69.0/24 -j REJECT
iptables -I FORWARD -s 129.134.70.0/24 -j REJECT
iptables -I FORWARD -s 157.240.0.0/17 -j REJECT
iptables -I FORWARD -s 157.240.0.0/24 -j REJECT
iptables -I FORWARD -s 157.240.10.0/24 -j REJECT
iptables -I FORWARD -s 157.240.1.0/24 -j REJECT
iptables -I FORWARD -s 157.240.11.0/24 -j REJECT
iptables -I FORWARD -s 157.240.12.0/24 -j REJECT
iptables -I FORWARD -s 157.240.13.0/24 -j REJECT
iptables -I FORWARD -s 157.240.14.0/24 -j REJECT
iptables -I FORWARD -s 157.240.17.0/24 -j REJECT
iptables -I FORWARD -s 157.240.18.0/24 -j REJECT
iptables -I FORWARD -s 157.240.19.0/24 -j REJECT
iptables -I FORWARD -s 157.240.192.0/18 -j REJECT
iptables -I FORWARD -s 157.240.193.0/24 -j REJECT
iptables -I FORWARD -s 157.240.194.0/24 -j REJECT
iptables -I FORWARD -s 157.240.195.0/24 -j REJECT
iptables -I FORWARD -s 157.240.196.0/24 -j REJECT
iptables -I FORWARD -s 157.240.197.0/24 -j REJECT
iptables -I FORWARD -s 157.240.199.0/24 -j REJECT
iptables -I FORWARD -s 157.240.200.0/24 -j REJECT
iptables -I FORWARD -s 157.240.20.0/24 -j REJECT
iptables -I FORWARD -s 157.240.201.0/24 -j REJECT
iptables -I FORWARD -s 157.240.2.0/24 -j REJECT
iptables -I FORWARD -s 157.240.204.0/24 -j REJECT
iptables -I FORWARD -s 157.240.205.0/24 -j REJECT
iptables -I FORWARD -s 157.240.206.0/24 -j REJECT
iptables -I FORWARD -s 157.240.209.0/24 -j REJECT
iptables -I FORWARD -s 157.240.210.0/24 -j REJECT
iptables -I FORWARD -s 157.240.21.0/24 -j REJECT
iptables -I FORWARD -s 157.240.211.0/24 -j REJECT
iptables -I FORWARD -s 157.240.212.0/24 -j REJECT
iptables -I FORWARD -s 157.240.213.0/24 -j REJECT
iptables -I FORWARD -s 157.240.216.0/24 -j REJECT
iptables -I FORWARD -s 157.240.217.0/24 -j REJECT
iptables -I FORWARD -s 157.240.218.0/24 -j REJECT
iptables -I FORWARD -s 157.240.220.0/24 -j REJECT
iptables -I FORWARD -s 157.240.22.0/24 -j REJECT
iptables -I FORWARD -s 157.240.221.0/24 -j REJECT
iptables -I FORWARD -s 157.240.222.0/24 -j REJECT
iptables -I FORWARD -s 157.240.223.0/24 -j REJECT
iptables -I FORWARD -s 157.240.24.0/24 -j REJECT
iptables -I FORWARD -s 157.240.26.0/24 -j REJECT
iptables -I FORWARD -s 157.240.27.0/24 -j REJECT
iptables -I FORWARD -s 157.240.28.0/24 -j REJECT
iptables -I FORWARD -s 157.240.29.0/24 -j REJECT
iptables -I FORWARD -s 157.240.30.0/24 -j REJECT
iptables -I FORWARD -s 157.240.3.0/24 -j REJECT
iptables -I FORWARD -s 157.240.6.0/24 -j REJECT
iptables -I FORWARD -s 157.240.7.0/24 -j REJECT
iptables -I FORWARD -s 157.240.8.0/24 -j REJECT
iptables -I FORWARD -s 157.240.9.0/24 -j REJECT
iptables -I FORWARD -s 173.252.64.0/19 -j REJECT
iptables -I FORWARD -s 173.252.88.0/21 -j REJECT
iptables -I FORWARD -s 173.252.96.0/19 -j REJECT
iptables -I FORWARD -s 179.60.192.0/22 -j REJECT
iptables -I FORWARD -s 179.60.192.0/24 -j REJECT
iptables -I FORWARD -s 179.60.194.0/24 -j REJECT
iptables -I FORWARD -s 179.60.195.0/24 -j REJECT
iptables -I FORWARD -s 185.60.216.0/22 -j REJECT
iptables -I FORWARD -s 185.60.216.0/24 -j REJECT
iptables -I FORWARD -s 185.60.217.0/24 -j REJECT
iptables -I FORWARD -s 185.60.218.0/24 -j REJECT
iptables -I FORWARD -s 185.60.219.0/24 -j REJECT
iptables -I FORWARD -s 185.89.218.0/23 -j REJECT
iptables -I FORWARD -s 185.89.218.0/24 -j REJECT
iptables -I FORWARD -s 185.89.219.0/24 -j REJECT
iptables -I FORWARD -s 204.15.20.0/22 -j REJECT
iptables -I FORWARD -s 31.13.24.0/21 -j REJECT
iptables -I FORWARD -s 31.13.64.0/18 -j REJECT
iptables -I FORWARD -s 31.13.64.0/19 -j REJECT
iptables -I FORWARD -s 31.13.64.0/24 -j REJECT
iptables -I FORWARD -s 31.13.65.0/24 -j REJECT
iptables -I FORWARD -s 31.13.66.0/24 -j REJECT
iptables -I FORWARD -s 31.13.67.0/24 -j REJECT
iptables -I FORWARD -s 31.13.69.0/24 -j REJECT
iptables -I FORWARD -s 31.13.70.0/24 -j REJECT
iptables -I FORWARD -s 31.13.71.0/24 -j REJECT
iptables -I FORWARD -s 31.13.72.0/24 -j REJECT
iptables -I FORWARD -s 31.13.73.0/24 -j REJECT
iptables -I FORWARD -s 31.13.74.0/24 -j REJECT
iptables -I FORWARD -s 31.13.75.0/24 -j REJECT
iptables -I FORWARD -s 31.13.76.0/24 -j REJECT
Then press `save firewall` button. And we're good!
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