How can I change default DNS servers?
How to block dns requests from google (8.8.8.8) and level3 (4.2.2.1, etc)?
I tried this with iptables but nothing happens:
iptables -A INPUT -s 8.8.8.8 -j DROP
iptables -A OUTPUT -d 8.8.8.8 -j DROP
iptables -A INPUT -s 8.8.4.4 -j DROP
iptables -A OUTPUT -d 8.8.4.4 -j DROP
iptables -A INPUT -s 4.2.2.1 -j DROP
iptables -A OUTPUT -d 4.2.2.1 -j DROP
iptables -A INPUT -s 4.2.2.2 -j DROP
iptables -A OUTPUT -d 4.2.2.2 -j DROP
iptables -A INPUT -s 4.2.2.3 -j DROP
iptables -A OUTPUT -d 4.2.2.3 -j DROP
iptables -A INPUT -s 4.2.2.4 -j DROP
iptables -A OUTPUT -d 4.2.2.4 -j DROP
iptables -A INPUT -s 4.2.2.5 -j DROP
iptables -A OUTPUT -d 4.2.2.5 -j DROP
iptables -A INPUT -s 4.2.2.6 -j DROP
iptables -A OUTPUT -d 4.2.2.6 -j DROP
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