What is the difference between "Public LAN" and "Private LAN"?

Discussion in 'Network Routers' started by xp_newbie, Nov 29, 2007.

  1. xp_newbie

    xp_newbie Guest

    I have a Westell 327W DSL modem/router and its DHCP config section has
    two types of LAN: Public and Private.

    For the life of me I couldn't figure out what it means. At first I
    thought that this means that "Public LAN" refers to DHCP clients that
    are not protected by the firewall, but then in the Westell 327W manual
    it reads:

    "The Public LAN feature, if available from your service provider,
    allows VersaLink to use LAN IP addresses that are accessible from the
    WAN. Public LAN allows your computer to have global address ability.
    To utilize the Public LAN feature on VersaLink, your ISP must support
    Public LAN and Static IP. Contact your ISP for details."

    I contacted my ISP (Verizon) for details but they were clueless.

    Can someone help?

    xp_newbie, Nov 29, 2007
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  2. xp_newbie

    John B Guest

    I speak without authority on this subject. I conjecture only.

    It seems that most of us use "private IP" network addressing, within our
    firewalled SOHO environments. e.g.,

    A "public LAN" address then, should be one that is registered with InterNIC.
    (?) As such, it is unique in all the world. Your router should allow
    pass-through, so that viewers can access your host so addressed.

    "Accessible from the WAN" implies "accessible from the internet at large."
    The WAN side of any firewall router is the uplink side, while the LAN side
    is the protected side. It is irrelevant whether one side or the other is
    "wired" or "wireless."
    John B, Jan 1, 2008
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