Rohit Gupta wrote:
Hi,
L2TP is an encapsulation that allows multiplexing of multiple PPP sessions
between two IP-connected endpoints, and a control protocol for dynamically
Since L2TP is so strongly tied with PPP, can i assume that it will be *mostly*
used when a user
dials (ISDN/modem) into the ISP network (LAC) to contact the corporate network.
It tends to be used rather often for PPPoA and PPPoE in DSL environments these
days as well.
Can I then connect a small branch office to the corporate network using L2TP?
Does it make any
sense doing that.
Sure, in some cases.
> I am now talking of a deployment scenario. Do you ever have two branches
connected via L2TP?
A number of small routers on the market today have the ability to initiate an
L2TP session from the router to an LNS.
> I searched the internet and found only scenarios wherein a remote access user
dials into the ISP to access the corporate network using L2TP. Is the former
possible?
Look for "L2TP voluntary tunneling" or "client-initiated L2TP"
Also, if you are going to be running L2TP over the Internet and you are worried
about folks hacking the connection, you would want to secure the L2TP tunnel
with IPsec transport mode as defined in RFC3193.
In theory, one could have a small office with some < 10 users connected to
switch which in turn
dials into the ISPs network. Is this possible?
If you are using L2TP over IP to connect to an ISP to get IP access you likely
have a bit of a chicken and egg problem.
But, yes, if you already have IP connectivity from one ISP, but want to use L2TP
to connect to another ISP (perhaps with some other value add on their network)
it is *possible* if the ISP allows L2TP connections from your router. Typically,
an ISP would accept L2TP connections only from a wholesale access provider (or
in some cases from their own PC client). In any case, you'd probably have to
find a very knowledgable person at your ISP to talk to this about as it likely
isn't standard practice.
- Mark
With regards,
Rohit
P.S.
And thanks to everybody for responding both on the list and offline!
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