VPN
From DD-WRT Wiki
DoC_DaR says in thread: http://forum.bsr-clan.de/viewtopic.php?p=23607
On DD-WRT, set pptp server to active, set IP of router (192.168.1.1), set range for connections(192.168.1.20-30) example of ten client set up.
Set up Chap Secret ex. ( testmachine * password1234 *) All done here.
Goto PC and select Create new Connection in Network Connection area. Select Connect to Network at my Workplace, select Virtual Private Connection, give it a name (home link).
Select what applies, dial up or LAN. Type WAN IP address (10.28.44.71) Must be static address. [loxza says that s/he has had luck with dynamic IP using dyndns.org]
Then at connect window, type name and password (testmachine password1234). Use no capital letters.
There is more info on winxp VPN at <[1]> under PPTP VPN.
Good Luck.