What are iptables policies?
What will be an ideal response?
The policy decides what happens to a packet that did not match a rule in the chain. The policy could either be to accept the packet or to drop it.
Two approaches are possible:
Everything is forbidden, except if explicitly allowed.
Everything is allowed, except if explicitly forbidden.
From a security viewpoint, only the first approach is valid.
To set the policy, use the -P option:
iptables -P FORWARD DROP
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What will be an ideal response?