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Linux Firewalls Cheat Sheet by

Linux commands for firewalls

firewalld (RHEL/­Fedora)

Command
Purpose
 
firewa­ll-cmd --state
Firewall status
 
firewa­ll-cmd --get-­act­ive­-zones
Active zones
 
firewa­ll-cmd --list-all
List zone config­uration
 
firewa­ll-cmd --list­-se­rvices
Allowed services
`firew­all-cmd --list­-ports
Open ports
 
firewa­ll-cmd --add-­ser­vic­e=http --perm­anent
Allow service
 
firewa­ll-cmd --remo­ve-­ser­vic­e=http -permanent
Remove service
 
firewa­ll-cmd --add-­por­t=8­0/tcp --perm­anent
Open port
 
firewa­ll-cmd --remo­ve-­por­t=8­0/tcp --perm­anent
Close port
 
firewa­ll-cmd --reload
Reload rules

UFW (Ubuntu)

Command
Purpose
 
ufw enable
Enable firewall
 
ufw disable
Disable firewall
 
ufw status
Show status
 
ufw status verbose
Detailed status
 
ufw allow ssh
Allow SSH
 
ufw allow 80/tcp
Allow port
 
ufw deny 23
Deny port
 
ufw delete allow 80/tcp
Remove rule
 
ufw reload
Reload rules
 
ufw reset
Reset firewall

IP Forwarding

Command
Purpose
 
sysctl net.ip­v4.i­p_­forward
Check status
 
sysctl -w net.ip­v4.i­p_­for­ward=1
Enable tempor­arily
 

iptables (Legacy)

Command
Purpose
 
iptables -L
List rules
 
iptables -L -n -v
Detailed rules
 
iptables -F
Flush rules
 
iptables -A INPUT ...
Append rule
 
iptables -D
Delete rule
 
iptables -I
Insert rule
 
iptables -P INPUT DROP
Set default policy
 
iptabl­es-save
Save rules
 
iptabl­es-­restore
Restore rules

ipset

Command
 
ipset create
 
ipset add
 
ipset del
 
ipset list
 
ipset destroy
 

NAT

Command
Purpose
 
iptables -t nat -L
View NAT table
 
nft list table nat
View nftables NAT rules

nftables (Modern)

Command
Purpose
 
nft list ruleset
Show all rules
 
nft flush ruleset
Remove all rules
 
nft add table inet filter
Create table
 
nft add chain ...
Create chain
 
nft delete rule ...
Delete rule
 
nft delete table ...
Delete table
       
 

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  • Published: 6th August, 2026

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