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07.30.2008 at 01:48PM PDT, ID: 23608992
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9.0

Strongest iptable configuration?

Asked by Envoy2064 in Linux Network Security, Networking Hardware Firewalls, Ubuntu

Tags: ,

Hi,
   I am new to Linux and iptables. I'm wondering if I can get "expert" verification of the iptables configuration listed in the following site: http://articles.techrepublic.com.com/5100-10878_11-5997057.html

According to that site, the following iptables configuration is "is superior, security-wise, to every single distro-default iptables configuration":

*mangle
:PREROUTING ACCEPT [48436:11233990]
:INPUT ACCEPT [48436:11233990]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [29730:6162034]
:POSTROUTING ACCEPT [29730:6162034]
COMMIT

*nat
:PREROUTING ACCEPT [391:49336]
:POSTROUTING ACCEPT [1793:110951]
:OUTPUT ACCEPT [1793:110951]
COMMIT

*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [1418:147349]
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 631 -j ACCEPT
-A INPUT -p all -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
-A INPUT -j DROP
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 22 -j ACCEPT
-A OUTPUT -p tcp -m tcp --sport 631 -j ACCEPT
COMMIT

So my questions are:

- Is it true that this is superior to most linux distro default configs?
- Will this configuration enable "stealth" mode?
- Can anyone explain what each block of text means? Is there any way to verify this using more official documentations?

Any insight into this will be much appreciated!Start Free Trial
[+][-]07.30.2008 at 04:18PM PDT, ID: 22125654

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[+][-]07.30.2008 at 04:29PM PDT, ID: 22125744

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[+][-]07.30.2008 at 06:33PM PDT, ID: 22126259

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[+][-]07.31.2008 at 12:29AM PDT, ID: 22127591

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[+][-]07.31.2008 at 07:50AM PDT, ID: 22130224

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[+][-]07.31.2008 at 10:49AM PDT, ID: 22131886

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About this solution

Zones: Linux Network Security, Networking Hardware Firewalls, Ubuntu
Tags: Linux, iptables
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Solution Provided By: MushyPea
Participating Experts: 2
Solution Grade: A
 
 
[+][-]08.02.2008 at 04:43PM PDT, ID: 22146054

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