May 2018
Intermediate to advanced
326 pages
8h 32m
English
Content preview from Practical Network Scanning
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Defense against port scans
So far, we have learned how to use port scanning techniques to discover and detect information about remote hosts. Let's try to understand that any services/hosts will be vulnerable to port scans, which are exposed to users through some sort of connectivity. This might include an enterprise WAN or the internet. Port scanning is also not classed as illegal activity unless information is used to exploit systems.
The amount of information that should be exposed to the outside world is down to the system administrator. Any IP scanning starts with an ICMP, and you can block all incoming ICMPs on an enterprise edge device. This will make Ping ineffective and will filter ICMP unreachable messages to block Traceroute as ...
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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.