How to clear an iptables rule

ClearOne of themIptablesThe rule is actually very simple:

Use iptables-I FORWARD-s XXX. XXX. XXX. after XXX-j drops multiple rules, how can I clear only one of them? I use IPCOP. After iptables-F is used, all rules will be cleared. Only after the router is restarted can I access the internet, how can I clear only one of them without clearing all of them?

A. Add A rule.

-D. delete a rule.

-I insert a rule

-F clears a chain

We can use either of the two methods to delete a rule. First, because we know that this is the only rule in the INPUT chain, we will delete it by number:

# Iptables-d input 1

Delete the rule numbered 1 in the INPUT chain

The second method is-A command ing, but replace-A with-D. This is useful when the rules in your chain are complex and you do not want to calculate their numbers. In this case, we can use:

# Iptables-d input-s 127.0.0.1-p icmp-j DROP

The-D syntax must be as accurate as-A (or-I or-R. If the chain contains multiple identical rules, only the first rule is deleted.

Through the above article, we should all learn one of the two methods. I hope this article will help you!

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