iptables linux firewall recommended rules for public computing

Whether you are at work, at the coffee shop or on the public internet here are some basic but effective rules for iptables that lock things down (eg. no one can SMB or SSH to you or really anything):

 

# Generated by iptables-save v1.4.21 on Fri Dec 14 14:00:08 2018
*nat
:PREROUTING ACCEPT [160:19844]
:INPUT ACCEPT [4:357]
:OUTPUT ACCEPT [2955:182236]
:POSTROUTING ACCEPT [2955:182236]
COMMIT
# Completed on Fri Dec 14 14:00:08 2018
# Generated by iptables-save v1.4.21 on Fri Dec 14 14:00:08 2018
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [1284:148262]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: "
-A INPUT -j DROP

COMMIT
# Completed on Fri Dec 14 14:00:08 2018

 


Tags:

iptables, linux, firewall, recommended, computingwhether, eg, smb, ssh, generated, fri, dec, nat, prerouting, input, output, postrouting, completed, filter, established, min, prefix, quot,

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