[icebraining]

This is network diagram described in the article:

                                                        +----------------------+
                                                        |                      |
                                          +-----------> | Neighbor's router    |
                                          |             |                      |
  +-----------+      +------------------+ |             +----------------------+
  |           |      |                  | +                                     
  | OP's PC   +----> | Buffalo Router   |               +----------------------+
  |           |      |                  | +             |                      |
  +-----------+      +------------------+ |             | OP Comcast connection|
                                          +-----------> |                      |
                                                        +----------------------+

There are no double connections to any router.