Networking

Add a Secondary IPv4 Address to Your VPS

This tutorial explains how to setup an additional IPv4 address on your Vultr VPS. We will assume the following: The Main IP Address of your VPS is 1.2.3.4. You have purchased an additional IP address through the Vultr control panel, and you were assigne...

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How to Establish a GRE Tunnel Between Two CentOS 7 Servers

Introduction What is GRE? What are some advantages? GRE stands for Generic Routing Encapsulation, which allows two servers to communicate privately. GRE tunnels are useful as they allow all types of traffic to go through. It is relatively easy to set up...

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Multiple Private Networks

Vultr introduced support for multiple private networks in early 2018. This feature is offered as an enhancement to the standard private networking. When enabled, you can allocate multiple isolated private networks in any of Vultr's datacenters. Private N...

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Installing Bro IDS on Ubuntu 16.04

Introduction Bro is a powerful open-source network analysis framework. Bro's primary focus is on network security monitoring. Bro also provides a platform for general traffic analysis as well as trouble-shooting assistance and performance measurements. I...

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Easy IPTables Configuration and Examples on Ubuntu 16.04

Introduction iptables is a powerful tool used to configure the Linux-kernel's integrated firewall. It comes preinstalled on most Ubuntu distributions, however if you are using a customized Ubuntu version or running inside a container you will most likely...

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How to Use Mosh on CentOS 7 for Remote Server Administration

Mosh, the abbreviation of "mobile shell", is a rising remote terminal application designed to provide better connectivity and user experience than SSH-based terminal applications. When talking about remote server administration technologies, SSH obviousl...

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How to Install OpenNMS on Ubuntu 16.04 LTS

OpenNMS is an enterprise-grade open source network management platform that can be used to monitor and manage numerous devices from a single instance. With all kinds of metrics collected by OpenNMS, system administrators can easily discover service outage...

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How to Install OpenNMS on CentOS 7

OpenNMS is an enterprise-grade open source network management platform that can be used to monitor and manage numerous devices from a single instance. With all kinds of metrics collected by OpenNMS, system administrators can easily discover service outage...

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Example Letter of Authorization for BGP Announcements

Please use the following template when requesting authorization for BGP announcements. AUTHORIZATION LETTER [DATE] To whom it may concern, This letter serves as authorization for Vultr with AS20473 to announce the following IP address blocks: [IP SPA...

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How to Setup Dynamic DNS

What is Dynamic DNS? Let's take a common example of a DNS setup. Your domain is example.com, and you have "A" records for server1.example.com and server2.example.com. Server1 is hosted in Vultr, but server2 is hosted on a local network, like inside your ...

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