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  1. #1
    Join Date
    Jan 2010
    Posts
    20

    Default question bout ppp

    why canot we see PPP or HDLC or FRAME RELAY headers in packet sniffers? i use wireshark as my packet sniffer.... but i alway see application tcp/udp then ip then ethernet header...... where does ppp or hdlc encapsulation take place???

    does that mean packt should look like application tcp/udp ip ppp????

  2. #2
    Join Date
    Nov 2008
    Location
    Birmingham, UK
    Posts
    1,441

    Default

    PPP and HDLC use their own frame header and trailer, in place of the usual Ethernet header. PPPoE encapsulates PPP frames inside an Ethernet frame. Compare a PPP captured frame header with an Ethernet header.
    CCNP R&S, CCNA DC
    Currently studying: CCIE R&S, CCNP Data Centre
    Follow my CCIE progress with study notes on my blog: http://beyondccna.blogspot.co.uk/

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