Linux Commands Reference - Complete Linux Command Guide
Comprehensive Linux command reference with 150+ commands. Search, filter by category, and view detailed usage examples.
iptables
Linux kernel firewall rule management
Syntax
iptables [OPTION]... COMMAND [CHAIN] [RULE-SPEC]Common Options
-AAppend rule to chain-DDelete rule-IInsert rule at head-LList all rules-FFlush all rules-PSet chain policy-tSpecify table-jSpecify target action-pSpecify protocol--dportSpecify destination port-sSpecify source addressCommon Examples
iptables -L -n -vList all rules
iptables -A INPUT -p tcp --dport 80 -j ACCEPTAllow HTTP traffic
iptables -A INPUT -s 192.168.1.0/24 -j ACCEPTAllow subnet
iptables -P INPUT DROPSet default drop policy
iptables -FFlush all rules
iptables -A INPUT -p tcp --dport 22 -j ACCEPTAllow SSH connections
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