Is this a good firewall to keep brute force atackers out?

Robin

7/20/24, 1:49 AM

I am wondering, is the script below a good firewall script to keep brute force attackers out off my desktop?

iptables -F
iptables -A INPUT -i lo -p all -j ACCEPT
iptables -A OUTPUT -o lo -p all -j ACCEPT
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT

Anyone?

1 + 3

iptables

firewall

user535733

7/20/24, 1:58 AM

Why specifically brute force attackers? What vulnerable service are they attempting to bruteforce? This seems like a possible [XY Question](https://en.wikipedia.org/wiki/XY_problem): You might be trying to ask about basic good security habits instead.

pLumo

7/20/24, 7:06 AM

Against bruteforce, there is `fail2ban`.

Doug Smythies

7/20/24, 2:08 PM

With a default OUTPUT policy of ACCEPT, you do not need `iptables -A OUTPUT -o lo -p all -j ACCEPT`. If your ip address is static then okay, but if DHCP then you need to allow it in.

Score:1

Ubuntu

24601

7/20/24, 7:31 AM

If you want a "hardened" version of Ubuntu then look at Ubuntu Pro rather than try to do the job yourself.

Ubuntu Pro is a security-hardened version of Ubuntu targeted at enterprise and corporate users who cannot compromise on stability. It is sold as a subscription, but it is free for non-commercial use on up to five computers.

How to Geek Reference

Ubuntu Reference

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Elon Musk

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