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Posts published in July 2018

Cisco switch security features cheatsheet

Shahriar 0

Cisco switches (running IOS) have plenty of features that are critical to modern networks. Some are Cisco security features that eliminate several important attack vectors on layer 2. This is arguably the most important defense mechanism because ACLs and security mechanisms on software (layer 7) will sometimes fall short protecting the network because of the extreme complexity of communication up in this layer. So the earlier you close the holes the better! As an example security features like protected ports can…

Inside Windows Page Frame Number (PFN) – Part 1

Sina Karvandi 0

Introduction (Page Frame Number) Windows and almost all the OSs use Page Frame Number Database in order to have a track of virtually allocated pages to know which page must be freed or evicted or if a page needs to be cached and etc. All of these kinds of stuff manages through a list, called Page Frame Number (PFN). A long list of explanation about the states of every physically and virtually allocated pages and its corresponding attributes. In the rest…

Captive portal detection with a working sample in all major OSs!

Shahriar 0

Hi everyone I’ve been working on a project which involves a developing a captive portal system from scratch. and I’m going to gradually post more of challenges we faced and the way we solved them too. But for now I’m going to talk about captive portal detection in different OSs and how we’ve implemented it. It is not a really difficult or lengthy concept but the sad thing is that it’s not very well documented or not even documented at…