Note that you can get this to work by doing 2 things.
1. Install Jon Welfringer's TCP/IP simulator mod. [Link: remotecentral.com]
2. Configure all your extenders in PEP2/PEP3 with fixed IP address and supply the IP address of the extender (Note that you should supply the real IP address of the extender so if DHCP, may want to update extender to used fixed IP address).