In this article I show how you can host multiple websites in containers on a single server. Each containers exposes a different port, which is…
Category: Networking
IPv6 subnets table
The below table shows IPv6 prefixes (/32 and greater), including the number of bits used for the network portion and the number of IP addresses.
IPv4 CIDR table
The below CIDR table lists all 32 subnet masks for IPv4 addresses, including the number of IP addresses that can be used for hosts.
Subnets in IPv6
Most IPv6 addresses are /64 addresses. However, that is not set in stone. If you need to create one or more IPv6 subnets, the basics…
Introduction to IPv6
When IPv4 addresses were invented in the early 1980s nobody suspected the world would ever run out of IP addresses. An IPv4 address is a…
How to calculate the number of IPs in a subnet
In my article about subnetting and CIDR I looked at how you can identify what part of an IP address is part of the network.…
Subnets and CIDR in IPv4
This article is a gentle introduction to IPv4 subnets and CIDR. It includes a brief history lesson about network classes that explains why subnets were…
CSF on the command line
Although CSF has a graphical interface for WHM, you might prefer to manage the firewall using the command line. This article covers the most common…
Managing the CSF firewall in WHM
ConfigServer Firewall (CSF) is commonly used on cPanel servers to stop malicious traffic going in and out from a server. Like most other firewalls, CSF…