How add rule to iptables in Linux CentOS 7 [Block other DNS]
How add rule to iptables in Linux CentOS 7 so as to:
ALLOW TCP/UDP IN/OUT to 208.67.222.222 or 208.67.220.220 on Port 53 and BLOCK TCP/UDP IN/OUT all IP addresses on Port 53
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Your best bet is to visit a Linux CentOS forum. This is where the nerds for the iptables command are.
Or see https://www.ixquick.com/do/search?q=iptables+block+dns
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