Archives for Networking Essentials
NGINX as a reverse proxy (for apache or any web server)
Reverse Proxies sit in front a web server (or server farm) to better distribute the load to the server (a load balancer in a sense. In fact, all load balancers…
HTTP Proxies – Fiddler versus Wireshark
Why Proxy your HTTP requests? Proxying requests providers more control. The three most common proxies: HTTP proxy (so you can close port 80 and 443) Internal DNS servers (proxy requests…
Quick ping and telnet tests
PING (does not equal internet connectivity) ping (cloudflare's dns) --> Should return something like Reply from : bytes=32 time=34ms TTL=55 ping (google's dns) Telnet (over port 80 = equals internet…
What each octet means – subdividing a network into multiple subnets
The Network Part vs. the Host Part --> Network Part .0 --> Host Part A subnet mask of means that the first three octets of the address will be used…
What is a Certificate Singing Request – CSR ?
A CSR is quite literally a request to have a certificate created and digitally signed by a CA. There are three important parts to a CSR: Your public key. The…
DNS servers for your VPN connection
Most VPN services that you can pay for will be configured to redirect all of your IP traffic through the VPN tunnel. (In openvpn, the server option is "redirect-gateway".) This will include…
Restoring Deleted AD Sites, Zones and Objects
Restoring an entire Deleted Site Running the Powershell commands, you may see some errors ('could not add object, as it is in ') . Just Ignore these (Quick) Restoring a Deleted…
Testing whether a client is part of an AD
Say your AD Site is 'AVARMA' - and you are trying to figure out if the following IP address is assigned to that site Doing this on the local client…
Active Directory Domain Basics
Active Directory domains are grouped in a tree structure; a group of Active Directory trees is known as a forest, which is the highest level of organization within Active Directory.…
Kubeadm – Bootstrap a kubernetes cluster
Building a cluster through various steps – kubeadm is the preferred way to start up a ; In the following order, kubeadm Kubeadm init Pre Flight Checks – Pull container…