Thus spake "Eric A. Hall" <ehall@ehsco.com>

The example blocks/domains are useful for what they are, but their scope of usefulness is much smaller than real blocks/domains when it comes to documenting the detailed interactions between hosts and networks on the public Internet.

They weren't intended for that purpose. If you need to show several networks connected to each other, RFC1918 space should suffice for nearly any example. For examples demonstrating NAT, you can use 192.0.2/24 on the outside and RFC1918 on the inside. Or, as at least one vendor does, you can use your own IP space in your examples. Given you only wanted a single /24 for your book (per your own statement), it's hard to imagine that one of the above address blocks couldn't be used. S -- Stephen Sprunk "So long as they don't get violent, I want to let CCIE #3723 everyone say what they wish, for I myself have always K5SSS said exactly what pleased me." --Albert Einstein