This IS possible for specific modes. Specifically, both the 2.0.x and 2.2.x kernels support patches to allow for both ONE or MULTIPLE PPTP users behind a IPMASQ server to connect to the -same- PPTP server. The 2.4.x kernels currently have a BETA version of a PPTP module available on the IPMASQ WWW site. Please check out John Hardin's PPTP Masq page for details.