This past July, I found myself looking for a way to test a web application from behind “the great firewall of China” (aka Golden Shield). The problem is that I can’t test that something works in China if I’m not in China. My first thought was to use Nord VPN to connect to a VPN …Continue reading "Hide My Ass VPN sucks for app testing"
I have been using Hamachi since first hearing about it on Security Now, over 10 years ago. Hamachi is a hosted virtual private network solution that can create links with devices that are behind NAT firewalls. Hamachi is able to do so by using server-assisted NAT traversal. I mostly use it to access virtual machines from outside of …Continue reading "Getting Hamachi working with the Raspberry Pi 3"
IPv4 addresses are divided into five classes. Each IP address class has a different maximum number of IPs that exist within it. Class First Octet Range Default Subnet Mask Maximum Number of Hosts Per Network A 1-127 255.0.0.0 16,777,214 Hosts (2^24-2) B 128-191 255.255.0.0 65,534 Hosts (2^16-2) C 192-223 255.255.255.0 254 Hosts (2^8-2) D 224-239 …Continue reading "What are IP address classes?"
This week’s phone app is the Network+ Vocabulary App. I have been taking a Network+ class at the Milwaukee Area Technical College and I figured that writing a study guide for the test, would both net me another app and help me study. For note, this covers the vocabulary for exam N10-005. Try it in …Continue reading "Killing two birds with one stone: The Network+ Vocabulary App"
The OSI (Open Systems Interconnection) model, is a conceptual model of computer-to-computer communications, over a network. It was defined was defined in ISO/IEC 7498-1, by the International Organization for Standardization (ISO) in 1984. The model is not meant to specify exactly what processes occur. Instead, it describes them. The OSI model, has seven layers: (1) Physical, (2) …Continue reading "What is the OSI model?"