May 2018
Intermediate to advanced
326 pages
8h 32m
English
Content preview from Practical Network Scanning
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System firewall configuration
To restrict traffic based on firewall rules, traffic should only be allowed into ports that need to be open for services. For example, secure web servers will need to provide access to TCP port 443 to most users, but they do not need Remote Desktop Protocol (RDP) or Secure Shell (SSH) management access from all source IPs.
For Windows, you can configure new inbound and outbound rules using advanced security options:
For Linux, sudo iptables -L lists your current rules in iptables. If you have just set up your server, you will have no rules and the output should be similar to the following screenshot:
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.