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Posted by Juergen Kluth on February 13, 2008, 9:20 pm
Hi,
Your answer confirms what i am starting to think about what i have read the
last hours (http://www.redbooks.ibm.com/redbooks/pdfs/sg242580.pdf ~ page
177 and on)
I want to dig into vpn. ... and started with rfc (?).
There (in the rfc) almost is the LAC at ISP configuration described and i
asked myself what i would have to do (call my ISP ?).
Seems to be "compulsory tunnel".
May be this config is of "earlier times", or has some special features (like
dedicated bandwith with tunnel over atm or has some security advantages
(?).).
I feel very sure this was a "product one could by from his ISP".
The other, "voluntary tunnel", was in my focus, because from my eye i am a
theoretical remote user with dsl (PPPoE - connection to ISP), but this isnt
easy to find in rfc.
And at least the Windows client is able to connect via L2TP (has the LAC in
it, i think).
still at the very surface ...
Thanx + regards
jk
>>> There's not much point in the ISP initiating the tunnel at their LAC
>>> if there's not something at the remote network end to terminate that
>>> tunnel...
>
>>You are right , i forgot the LNS
>>But again : If i would or would have to work with this config:
>>-Must i ask in this case wether the ISP has a "LAC" capable device
>>(normally
>>i would assume a DSLAM or else for the endpoint of my dial up connection)
>>?
>>to create a tunnel to "my" LNS ?
>
> Not sure what the question is here. In this model of you connecting to
> an ISP, and the ISP auto-tunneling your taffic, yes, the ISP would
> have to have a RAS/BRAS device capable of being a L2TP LAC. That in
> turn would identify your clients dialing in and auto-starting the
> tunnel for that user to the LNS.
>
>>-"My" LNS, must the this be connected by a fixed / leased line ? Or must
>>it
>>just typically have a constant IP address ?
>
> It can be anywhere you have IP connectivity to. Policies of the
> service the ISP offering you L2TP services may dictate what they
> consider reasonable for connection back to your LNS. The L2TP
> tunnelling all happens on the layer-3 IP layer though.
>
> A fixed IP address is pretty much a given for the LNS end.
>
> The other model you originally mentioned last in your first post with
> an onsite CPE user device being a LAC to initiate the tunnel across
> the Net doesn't require the ISPs involvement in any fashion what-so-ever.
>
>
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