From time to tie I need to reference the use of a IP alias called RFC1918 to separate traffic from local network from other (aka “Internet”) traffic. RFC 1918 was published to “Address Allocation for Private Internets”, which is our local network. There is nobody on internet using any IP in the range described by RFC 1918. Those IPs are only found inside our house/offices!
Go to Firewall >> Aliases, click on Add and do as follows:
- Name: RFC1918 or Private_IPv4s
- Description: All private IPv4 networks
- Type: Networks
Click on Save and Apply changes and this alias can now be used by firewall rules to distinguish between local and Internet traffic!