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Thread: Wildcard mask

  1. Junior Member
    Join Date
    Jun 2011
    Location
    Los Angeles, Ca
    Posts
    19

    Certifications
    Healthcare IT technician, RHIA, Project +
    #1

    Default Wildcard mask

    I am basically a caretaker for a network someone else setup, using 3550 multilayer switches.

    Some of the switches have ACLs, and he's using some wildcard masks that make no sense to me.

    0.0.251.255
    0.0.0.9

    From my study, those would equate to non-valid subnet masks of 255.255.4.0 and 255.255.255.246.

    I asked him about this but he was evasive.

    How is he getting away with this?
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  2. Senior Member
    Join Date
    Jan 2013
    Posts
    169
    #2
    Wildcard Masks arent just an inverse subnet mask matching entire length - here's a good explanation

    https://howdoesinternetwork.com/2013/wildcard-mask
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