Limit speed/bandwidth of VPN clients on Linux server

I need a way to limit the Internet connection speed of VPN clients on a linux server. The VPN I'm currently using is PPTP. Users can connect to the server and then access the Internet via the VPN connection. I would like to be able to set their Internet access speed to something around dialup speed. When the VPN users/clients connect to the server, they are issued an IP address (either internal or external). So I imagine the speed limiting (bandwidth limiting) will take place on the IP address. All users/clients will receive the same speed. Therefore, the 1 script/solution you provide should simply apply to a list or range of IP addresses on the server. I have heard that "tc" (netem) might be one solution. But I'm not familiar with it. Whatever your suggestion is, I will also need to know what (if any) server requirements or kernal modifications will be necessary. Thanks for reading! ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Linux (Debian or CentOS)