Re: serial-line protocols
From: Michael McDonough (mpm_at_atceast.com)
Date: 09/03/04
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Date: Fri, 3 Sep 2004 06:34:27 -0700 (PDT) To: Raj Malhotra <ral.mal@gmail.com>, "Vijayakumar.S" <vijay@nsecure.net>
Not sure what your asking regarding "the protocol
converter", but if you need to tap into that fiber
link then why don't you just run a pair of
ethernet<->fiber "bridges back-to-back? Then you tap
the eth in the middle.
--- Raj Malhotra <ral.mal@gmail.com> wrote:
> 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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