August 2018
Intermediate to advanced
482 pages
12h 44m
English
Content preview from Practical Linux Security Cookbook - Second Edition
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How to do it...
We will try to create a basic rule set of iptables, using which we will restrict all the incoming packets, except for those that are necessary for us:
- The first step will be to create a rule to allow access to the loopback interface so that the services on the system can communicate properly with each other locally. The command to do so is as follows:
iptables -A INPUT -i lo -j ACCEPT
This is necessary for the system to function properly.
- Next, we will create the rule for the outbound connections that have been initiated by our system:
iptables -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
This will accept ...
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