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Shadowsocks is a fast tunnel proxy that helps bypass firewall limitations. For more details, you can refer to its homepage. The installation of shadowsocks on CentOS-7 is pretty easy as we just need to run pip, as below: # pip install…

How can I keep a log of hourly, daily, monthly network traffic for my server as its monthly traffic is limited? vnStat is a tool that designed for this.  vnStat is a console-based network traffic monitor for Linux and BSD…

I was using TP-Link WN725N on Raspberry Pi, it worked smoothly well even without any additional configurations. While when I plugged it on a Debian desktop, I noticed that the adapter cannot work at all.

I had occasion recently to try and figure out how to use the builtin firewall to prevent some “bot” from hitting the services running on a Macbook. Mac OS X comes with the FreeBSD firewall program that called IPFW. It’s…

You may have heard of Netperf, which is a benchmark tool that is used to measure the performance of many different types of networking.  But normally what we care are the throughput and latency. As the throughput may affected by…

There are ways to do port forwarding and redirection. We will show some examples here. Redirect a port When you need to redirect a port to another one on local host, it’s quite easy, here is the trick

GSLB is short for Global Server Load Balancing, and is a tried and tested way of improving the availability and speed of Internet-based services. GSLB enables distribution of traffic across multiple sites, manages disaster recovery, and ensures that applications are…

When running in promiscuous mode, all traffic the network card receives can be read. This configuration is useful for us to do network monitoring, like for a network intrusion detection system.