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Changing subnet masks when subnetting

Discussion in 'Network Infrastructure' started by oliness, Nov 6, 2008.

  1. oliness

    oliness Bit Poster

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    Do different subnets on the same network always need to have same subnet mask? Say you have two subnets that both have a /24 mask. If you need to expand the number of hosts on one subnet by so much that it will need a /23 mask but the other subnet does not need any additional hosts, do you still also need to change the other subnet's mask to /23? Are there any problems if you don't do this?
     
    Certifications: A+, Security+, MCP, MCSA
    WIP: MCSE
  2. Tinus1959

    Tinus1959 Gigabyte Poster

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    No. This technic is called VLSM, Variable Lenght Subnet Masking. You just use the mask you need to support the users.
     
    Certifications: See my signature
    WIP: MCSD, MCAD, CCNA, CCNP

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