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GRE and L2TP

2004-03-17 22:16:23
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.

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