I have the following question, which I posted on the main site; however, it was closed as too broad.
- There was a concern expressed since this is not a question about the operation of my own network, which is one of the on-topic conditions in the help center. Is the question below on-topic?
- If the question is on-topic, what should I change to make it less broad?
- What parts of the question need to be clarified?
How the router (home gateway router) decides when to use PPP? Means by looking at which parameters it decide ? is it only during VPN ?
From where the role of L2TP starts ? is it from DSLAM ? My frnd told that it starts from BRAS/NAS. I think DSLAM could be a LAC.
If a VPN is been established, then until the VPN terminates does all the data go through the L2TP ? Can we send data w/o tunnel during VPN connection ?
During session establishment in L2TP there is a chance (is it a chance or always ?) that LNS can send a re-configuration message. If re-config happens for e.g if during starting PPP is established with PAP but LNS wants a CHAP then how that happens ? Because according to RFC host should not know about PPP and L2TP, so what type of request is been sent to the Host ? And also during the session if another LNS wants a PAP how it works ? Where the user authentication file saved in HOST side ?
There is been mentioned that During re-configuration of L2TP by LNS it assigns private address to the LAC. So is this private address is something like new address to the HOST ? How this works ? How DHCP-S manages this ?
After session establishment in L2TP, there is no role of LAC ? What about the Tunnel path ? Means does it come through BRAS or not , i think yes because of AAA ? But if tunnel comes through BRAS then how LAC avoids it ? how multiple sessions senario will work here if LAC avoids it ?