Simple Pix questions

Discussion in 'Cisco' started by Ian McKellan, Jan 7, 2006.

  1. Ian McKellan

    Ian McKellan Guest

    Hi guys,
    New to pix so just two quick questions:

    1. What is the 0.0.0.0 0.0.0.0 network mean? Does this mean any network?

    2. What is the subnet mask 255.255.255.255? And how is this different than a
    regular /24 subnet mask in pix language?

    Thank you.
    Ian McKellan, Jan 7, 2006
    #1
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  2. Ian McKellan

    Make Guest


    > New to pix so just two quick questions:
    >
    > 1. What is the 0.0.0.0 0.0.0.0 network mean? Does this mean any network?

    This is default route.

    > 2. What is the subnet mask 255.255.255.255? And how is this different than
    > a regular /24 subnet mask in pix language?

    This means host.
    Make, Jan 7, 2006
    #2
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  3. "Make" <> wrote in message
    news:dpnul4$ea9$...

    > > 2. What is the subnet mask 255.255.255.255? And how is this different

    than
    > > a regular /24 subnet mask in pix language?

    > This means host.

    and by this it means, that the IP portion must be a host and not a subnet.
    fx
    192.168.1.10 255.255.255.255 - means this specific host
    and
    192.168.1.0 255.255.255.0 means the entire network i.e. 192.168.1.1-.254

    HTH
    Martin
    Martin Bilgrav, Jan 7, 2006
    #3
  4. In article <ZpNvf.4102$>,
    Martin Bilgrav <> wrote:
    >192.168.1.10 255.255.255.255 - means this specific host
    >and
    >192.168.1.0 255.255.255.0 means the entire network i.e. 192.168.1.1-.254


    In the context of static() statements, in PIX 6,
    192.168.1.0 255.255.255.0 in reference to an -inside- IP would
    mean "translate 192.168.1.1-.254 but specifically block packets
    that appear to be from host 192.168.1.0 or host 192.168.1.255 as those
    are assumed to be the base and broadcast addresses of the subnet
    and so should not have any traffic -from- them; in the IDS functions,
    mark traffic that would have been translated to hosts 192.168.1.0
    and 192.16.1.255 as destinations as if it was an attempt to send
    traffic to a broadcast address."

    However, in *most* other cases, 192.168.1.0 255.255.255.0 would
    mean hosts 192.168.1.0 through 192.168.1.255 with no restrictions
    on traffic to or from 192.168.1.0 or 192.168.1.255 .

    There are only few other cases in PIX 6 where the first and last
    addresses are assumed to be base and broadcast addresses. Interface
    addresses of coures. I found one situation documented last week, but it
    has slipped my mind again. Not explicitly documented but inferrable
    by various bits of documentation is that dynamically allocated addresses
    are assumed to be embedded in such a situation.
    Walter Roberson, Jan 7, 2006
    #4
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