GRE over IPSec Tunnel and NAT Between Cisco and VyOS

The goal of this tutorial is to provide a configuration for Cisco and VyOS network devices with configured PAT (Port Address Translation) that connect two remote sides A and B through point-to-point GRE tunnel encapsulated into a IPsec tunnel. In a previous tutorial we proved that GRE tunnels in conjunction with IPsec tunnels transmit multicast traffic while data […]
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Building Linux L3 switch/router on x86 - Part6 - Connecting Box to the Internet - NAT and Firewall Configuration

This is another tutorial from the series of tutorials that describe building Linux Layer 3 switch on x86 hardware. In a previous tutorial we connected our switch to the Internet via routed port. To connect LAN users to the Internet we have to configure NAT and firewall on the switch. The article shows firewall and […]
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Building Linux L3 switch/router on x86 - Part1 - Introduction

1. What is your tutorials about building L3 switch offering? Frankly, nothing. But if you want to learn how to build our own Linux Multilayer switch/router from scratch, the next several tutorials might help you. 2. Why should I waste my time on reading? Firstly, it is about getting knowledge. Even if you are an experienced Linux […]
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