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Chapter 2. Firewalls with iptables and ipchains > Inserting Firewall Rules
Recipe 2.18. Inserting Firewall Rules
2.18.1. Problem
Rather than appending a rule to a chain, you want to insert or replace one elsewhere in the chain.
2.18.2. Solution
Instead of the -A option, use -I to insert or -R to replace. You'll need to know the numeric position, within the existing rules, of the new rule. For instance, to insert a new rule in the fourth position in the chain:
