Dear Rick, first my apologies that i have to write a post like this but i couldnt resist my urge to make this request. I am quite sure it will be helpful to all ppl like me who want to gain expertise like you and other experts here.
My question is simple, we all can see you are proficient in almost all areas of routing and switching. How do you do this ? i know you are in this field for a long time but one can be judged by his wordings and explanations that you dont only know how to make something work but also have a sound background information on how something is actually working. How do you approach to understand something ?
Take for example, i have seen your answers on AAA. Lets talk about it. What path will you take to understand AAA so that you are sure you have understand each and everything and are able to implement it with complete knowledge. There are simply lots of things right ? so how do you approach them to make sure you understand them fully !!!
I am not afraid of hardworking but no matter how much i read i still think i havent even reach the intermediate level of that technology.
No one shares his secret but over here i am making a request if you could share how to understand technology like you.
Kindly just dont skip this post, provide something that could really help me, after all its just a request Sir.
I admire all the experts here, pls no one be offended as to i just addressed Rick but i simply admire him and have learnt a lot from his answers here.
Waiting for your answer Sir....
I have looked at your post about using ppp over Frame Relay with virtual-access and I believe that the explanation given by Giuseppe is pretty good. It is a fairly well known fact that to ping your own IP address on a serial interface the router must actually send the ping request over the interface which will be received by the peer at the other end of the link. And the peer must forward the ping request back to you. (and then you must send the response over the link and the peer must receive the response and send it back to you).
When the encapsulation on the link is ppp or HDLC the situation is straightforward and you can ping your own address since the router will forward everything for the subnet out the interface. But when the encapsulation is Frame Relay the situation introduces the necessity of mapping addresses to DLCIs. It is a reasonably well known fact that in multipoint Frame Relay that you can not ping your own IP address until you provide a mapping of the address to a DLCI since Frame Relay will not automatically produce that mapping.
The situation becomes more complex when you mix PPP and Frame Relay. When you run PPP over Frame Relay there is not a good way to map your own address to a DLCI.