Hi, What is it in L2TP that i cant do with a simple GRE tunneling when implementing a remote access VPN for a mobile client to connect to the corporate network. In L2TP, since it uses PPP end-to-end, the LNS is able to supply dynamic IP address using IPCP to the remote client. LNS takes this IP address from a pool of IP addresses it has. If one were to use GRE, then the same can be done by using some out-of-band mechanism (or even have a fixed IP address which the mobile client is instructed to use). GRE will tunnel the data packet originated from the mobile client, the inner IP header will have the ip addresses as assigned by the corporate network. The outer IP header will contain the IP address of teh ISP and the gateway to reach the corporate network. My whole point is that i want to know as to what is the burning need to have L2TP! Regards, Rohit P.S. Am not sure if this is indeed the right place to ask this question. But since there will be a lot of experienced people on this list who would have worked on both these protocols, replying to this one should be very easy. __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com