Acknowledgments

I'd like to thank a number of people who have helped to make this project a reality. First and foremost are Michelle and Chris at Cisco Press, without whose help this book would still be on the drawing board. And I don't want to forgot all the other Cisco Press people involved with the production of this book, including: Marc, Patrick, Ginny, Tammi, Gina, Louisa, Brett, and Larrythanks!

I'd also like to thank the technical reviewers, Henry Benjamin, Tim Sammut, Wen Zhang, Nathan Lohr, Ivan Pepelnjak, Robert Brown, and Andrew Makin, who contributed interesting and useful comments as I went along.

Finally, I'd like to thank W. Mark Townsley for reviewing Chapter 5, as well as Glen Zorn and Luca Martini for confirming important points with regard to PPTP voluntary tunnel mode architecture and draft-martini Layer 2 MPLS transport respectively.

Also, thanks to Vicky at Astricom for the loan of one of Astricom's ISDN simulators.