Re: serial-line protocols

From: Raj Malhotra (ral.mal_at_gmail.com)
Date: 09/01/04

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    Date: Wed, 1 Sep 2004 20:05:51 +0530
To: "Vijayakumar.S" <vijay@nsecure.net>

    Hi,

                                                                    
    ----------------------------------
    ----------------------------------
    | ROUTER | -------PPP fiber link---| ROUTER |
    ----------------------------------
                                                                     
    ----------------------------------
           | |
    ------------------ ------------------
    | switch | | switch |
    ------------------ ------------------

    We are not allowed to touch the left part of the diagram for any type
    of deployment
    due to policies. We can deploy only on the outgoing link which is PPP.
    If we deploy any of the optical taps, the tap only splits the light
    wave to give us a portion
    of the raw data going on the link. Our NIDS has an ethernet interface
    and hence we need
    a protocol converter to convert from PPP to ethernet frames.
    How does the protocol converter detect the IP frames before it can
    encapsulate it into
    an ethernet frame and send out.

    Raj

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