Is it possible to configure a Cisco 837 (SOHO 97) as an "half bridge" (or ZIPB or "dhcp spoofing") A

Discussion in 'Cisco' started by saratoga444in, May 21, 2006.

  1. Hi,

    my ADSL connection is a dynamic IP, public IP, PPPoA (no, PPPoE is not
    available) connection. I would like to use my Cisco 837 as an "half
    bridging" ADSL modem, a functionality that many cheap ADSL
    modem/routers have: is it possible to configure it in a such way?

    "Half brigding" (sometimes called "dhcp spoofing" or ZIPB or "zero IP
    bridging") makes possible to assign the IP address you obtain from your
    provider (the only one it gives you) to some host on your DMZ/LAN
    (maybe a more powerfull router) without any NAT on the ADSL modem.

    Here is how it works:

    1) the ADSL modem connects to the internet provider using PPPoA and
    obtains a (dynamic) public IP address

    2) the ADSL modem's DHCP server listens on the LAN (of course the modem
    has to have an ethernet port) and gives the public IP address (the one
    obtained upon connection) to any LAN client who requests one

    3) the ADSL modem forwards the traffic destinated to the public IP from
    the ATM interface to the LAN, and viceversa... without any NAT!

    So, is it possible to configure my Cisco to act like this?
    saratoga444in, May 21, 2006
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  2. saratoga444in

    Merv Guest

    Merv, May 22, 2006
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