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  • How to change subnet?

    Hi all,

    Please I need to icrease subnet in my network. Now I have subnet 192.168.1.0 / 255.255.255.0. I would like to change it to 192.168.1.0 / 255.255.252.0. It is simple, but is it problem in my enviroment?

    I have 2 domain controllers running on windows 2003 R2 standart, DNS active directory integrated. DHCP server.

    one windows 2003 standart server with Exchnage 2003.

    Does anybody know how to do it correctly?

    Thanks
    Thanks

    Caspi

  • #2
    Re: How to change subnet?

    I'd have a look at who has a fixed IP, they will have to be changed manually, the the DHCP server for one.

    Also you may want to look into using a Class A or Class B private range instead of a Class C just to make things easier as/if you grow.
    I don't know anything about (you or your) computers.
    Research/test for yourself when listening to free advice.

    Comment


    • #3
      Re: How to change subnet?

      I think it is not so easy, what about DNS, and domain controllers and exchange? changes are automatic?
      Thanks

      Caspi

      Comment


      • #4
        Re: How to change subnet?

        Yeah you should be fine, you are
        Originally posted by caspi View Post
        DNS active directory integrated.
        Are objects set to automatically register themselves?
        You may need to restart some services/servers to get them to refresh.

        To be complete.
        You will have to check you routers, switches, printers, firewalls and any other network attached/aware devices.
        Will your DHCP scope's exclusion range need to be changed?
        Will any mappings change?
        Are there any programs/databases with hard coded IP addresses which might need to be looked at?
        Have you a MIMEsweeper?
        You are using a frontend server for exchange?
        For exchange to be 100% sure it might be best to ask in the exchange forum.

        I believe that almost everything you've to consider but if I've missed something there is more then just I here.
        I don't know anything about (you or your) computers.
        Research/test for yourself when listening to free advice.

        Comment


        • #5
          Re: How to change subnet?

          Changing your subnet mask to 252 will decrease the amount of available addresses.

          Business are usually always recommended to use a class A. Try using 10.x.x.x for your change. You should not see any LOCAL impact.

          Please be aware: if you have multiple sites, routers, switches, servers, they will need to be reconfigured for the new subnet. Servers (which usually have static IPS) will need to have their IPs changed.

          Comment


          • #6
            Re: How to change subnet?

            Originally posted by ifoam View Post
            Changing your subnet mask to 252 will decrease the amount of available addresses.
            It is not true...
            Thanks

            Caspi

            Comment


            • #7
              Re: How to change subnet?

              Originally posted by ifoam View Post
              Changing your subnet mask to 252 will decrease the amount of available addresses.
              Not true. A 255.255.255.0 subnet will give you 254 free addresses.
              A 255.255.252.0 will give you 1022 free addresses

              Originally posted by ifoam View Post
              Business are usually always recommended to use a class A. Try using 10.x.x.x for your change. You should not see any LOCAL impact.
              The broadcast domain will be too large. I don't see why this is recommended?

              Originally posted by ifoam View Post
              Please be aware: if you have multiple sites, routers, switches, servers, they will need to be reconfigured for the new subnet. Servers (which usually have static IPS) will need to have their IPs changed.
              Ip addresses doens't need to be changed.
              It depends how the subnet will be created. SubnetMask needs to be changed.
              Marcel
              Technical Consultant
              Netherlands
              http://www.phetios.com
              http://blog.nessus.nl

              MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
              "No matter how secure, there is always the human factor."

              "Enjoy life today, tomorrow may never come."
              "If you're going through hell, keep going. ~Winston Churchill"

              Comment


              • #8
                Re: How to change subnet?

                Wouldn't it be easier to go down the:
                192.168.10.0/255.255.x.x route?

                You'd then have 192.168.1.x and 192.168.10.x ranges to play with.

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