Adding VLAN Tagging
Right now we have a rather simple network configuration. We have a single router with a public-facing IP address on one interface and a private IP address on the second interface. But what if we want to have multiple private networks behind the route?
Our first option in this scenario would be to add additional IP addresses to the internal interface. The ip command allows you to assign multiple IPs to a single interface, with optional interface aliases like eth0:0. This will allow you to assign IP addresses to systems behind the firewall within one of the few ranges and have them all route appropriately.
The downside of this approach is that all the internal IPs exist within the same collision domain of the network. This has ...
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