Throughout all my posts I will be using IP addressing that is purposefully reserved globally for use in documentation, these ranges are; 192.0.2.0/24 (TEST-NET-1) 198.51.100.0/24 (TEST-NET-2) 203.0.113.0/24 (TEST-NET-3) You can read more about this in RFC5737 and I generally use these ranges to document internet connectivity in addition to the standard RFC1918 addressing for internal