unnumbered for ethernet?

Discussion in 'Cisco' started by Cen, Aug 29, 2005.

  1. Cen

    Cen Guest

    Hi all,
    Do ethernet interfaces support ip unnumbered?
    If not, how do ISPs deliver ethernet termination to customers (e.g. via
    Metro LAN) who require only 1 public IP address? If it were to be delivered
    via traditional ethernet, the minimal address space of /30 would take up 4
    IP addresses; wasting 3 away.
    Cen, Aug 29, 2005
    #1
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  2. In article <dev2sm$7gk$>,
    Cen <> wrote:
    :Do ethernet interfaces support ip unnumbered?

    Not usually, in my experience.

    :If not, how do ISPs deliver ethernet termination to customers (e.g. via
    :Metro LAN) who require only 1 public IP address? If it were to be delivered
    :via traditional ethernet, the minimal address space of /30 would take up 4
    :IP addresses; wasting 3 away.

    PPPoE is one way, the way often used for ADSL.

    Another method, often used for broadband cable, is to use a switched
    or shared segment and have filters that cut out everything other than
    broadcasts and traffic directed to the IPs. This might be accompanied
    by some sort of encryption to prevent people from tapping in before
    the filters.
    --
    "This was a Golden Age, a time of high adventure, rich living and
    hard dying... but nobody thought so." -- Alfred Bester, TSMD
    Walter Roberson, Aug 29, 2005
    #2
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