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 networks.