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613 Views 8 Replies Latest reply: May 16, 2012 3:07 PM by Vivek Nagar RSS

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MAC address

May 7, 2012 3:05 AM

Mayur 56 posts since
Apr 25, 2011

Hi, Friends...

 

Recently, I have learned that when when One device send packet to another device, it automatically adds it MAC address. Ya got it!!!

 

 

But, now my question is that this is limited with Ethernet Technology

 

what about serial line...or leased line connectivity

 

i want to know that what happend when packet goes through one serial interface to another serial interface. i know the fact that both addresses are necessary to succeessfully communication (MAC & IP Address).

 

which addresses are used in serial technology plz  help me!!!!

 

mayur

  • AshwinR 357 posts since
    May 7, 2012
    Currently Being Moderated
    1. May 7, 2012 6:56 AM (in response to Mayur)
    Re: MAC address

    On Serial Link we do not use Ethernet as you have already stated, instead the following are used:Frame Relay, ATM, PPP HDLC etc..

     

    Ethernet          MAC Addess

    Frame Relay   DLCI 

    ATM                VPI/VCI

  • Vivek Nagar 141 posts since
    Jan 25, 2010
    Currently Being Moderated
    2. May 7, 2012 7:05 AM (in response to Mayur)
    Re: MAC address

    Hello Mayur,

     

    For serial link, if you open the frame you can see mac address is

    broadcast MAC address (FF:FF:FF:FF:FF:FF).

     

    as serial P2P has only one end.

     

     

    Thanks

    Vivek

  • Kumar Mantri 311 posts since
    Jan 6, 2011
    Currently Being Moderated
    3. May 7, 2012 8:09 AM (in response to Vivek Nagar)
    Re: MAC address

    Hello Network specialist,

     

    there is no way it shows the broadcast address in the frame on serial links when using wan protocols hdlc,ppp, etc

     

    in L2 part if we use HDLC,PPP we can see just the type of wan protocol using and its contents thats all or if we use FRAMERELAY as a wan protocol and as we map with dlci's there dlci's act as a L2 address for framerelay network.

    Regards,

    Kumarmantri

  • Mr. Akshay J 132 posts since
    Jul 3, 2011
    Currently Being Moderated
    4. May 9, 2012 5:29 AM (in response to Kumar Mantri)
    Re: MAC address

    Dear Mayur,

    On point to point links, just because there is only one way out, there is no need for any addressing.

    A simple example, when two people are talking to each other, they have no need to refer to each other by names, since only one person is listening to it on the other end.

  • Vivek Nagar 141 posts since
    Jan 25, 2010
    Currently Being Moderated
    6. May 9, 2012 12:01 PM (in response to Mayur)
    Re: MAC address

    Hi Friend,

     

    kindly see below line for HDLC

     

    The Address field is used to specify the type of packet contained in the cHDLC frame; 0x0F for Unicast and 0x8F for Broadcast packets.

     

    PPP

     

    Address - In HDLC environments, the Address field is used to address the frame to the destination node. On a point-to-point link, the destination node does not need to be addressed. Therefore, for PPP, the Address field is set to 0xFF, the broadcast address. If both PPP peers agree to perform address and control field compression during LCP negotiation, the Address field is not included.

     

    thanks

    Vivek

  • Kumar Mantri 311 posts since
    Jan 6, 2011
    Currently Being Moderated
    7. May 10, 2012 5:54 AM (in response to Vivek Nagar)
    Re: MAC address

    Hi Vivek,

     

    i absolutely agree with you that hexFF means all stations, but in the address of field of PPP protocol the address is of  hexFF which is of 1byte not the 48 bit mac-address FF:FF:FF:FF:FF:FF

     

    Regards,

    KumarMantri

  • Vivek Nagar 141 posts since
    Jan 25, 2010
    Currently Being Moderated
    8. May 16, 2012 3:07 PM (in response to Kumar Mantri)
    Re: MAC address

    Kumar,

     

    PPP address field set to 0xFF

     

    thanks

    Vivek

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