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  • Sites and Services

    Hi Guys,
    In our company we have a big site and services deployment.
    We have 3 domains in the forest.
    Lately when I join a computer in one of the domain it shows up in a different site that is supposed to be in.
    What could be going wrong?
    I checked and the IP range is in the correct site that it is supposed to be in.

  • #2
    Re: Sites and Services

    what do you mean "it shows up in a different site that is supposed to be in" ?
    could you please elaborate this a bit more.

    Comment


    • #3
      Re: Sites and Services

      Hi Akila,
      So I have 4 sites with 4 different subnets.

      Site A IP range: 10.1.1.1/24
      Site B IP range: 10.2.1.1/24
      Site C IP range: 10.3.1.1/24
      Site D IP range: 10.4.1.1/24

      Every site has 2 DC in it [for redundancy]
      All this is specified in Sites and Services correctly.

      When I join a computer with ip for example 10.1.1.50 to the domain, in my opinion the first DC to know about that should be one site A.
      So when I use the mmc active directory users and computers and I login in that DC [of Site A] I do not see that computer yet, but for example site B is the first one to know about it.
      After replications happens site A knows about it.

      My question is how can I make sure that site A is the first one to know about it?
      I checked the IP ranges and everything is correct.

      Any help is appreciated.

      Comment


      • #4
        Re: Sites and Services

        Your subnet mask is wrong. you're using a /24 subnet mask which means that the first three octets are in the same network, so 10.1.0.0, 10.2.0.0, 10.3.0.0, and 10.4.0.0 are all in the same subnet. You probably meant to use a /16 subnet which would mean that 10.1.0.0, 10.2.0.0, 10.3.0.0, and 10.4.0.0 would all be different subnets. The only way to correct this is to change your subnet mask.

        Comment


        • #5
          Re: Sites and Services

          Hi joeqwqerty,
          You are correct I made a typing mistake.

          Comment


          • #6
            Re: Sites and Services

            Was your mistake in Sites and Services or in your post? What is the subnet mask you are using?

            Comment


            • #7
              Re: Sites and Services

              Originally posted by joeqwerty View Post
              Your subnet mask is wrong. you're using a /24 subnet mask which means that the first three octets are in the same network, so 10.1.0.0, 10.2.0.0, 10.3.0.0, and 10.4.0.0 are all in the same subnet. You probably meant to use a /16 subnet which would mean that 10.1.0.0, 10.2.0.0, 10.3.0.0, and 10.4.0.0 would all be different subnets. The only way to correct this is to change your subnet mask.
              Actually, no....
              A 24 bit subnet mask means that the first three octets must be the same for the computers to be on the same network, so all four subnets are separate.

              I agree that a 16-bit mask is probably needed so that e.g.
              10.1.1.0 and 10.1.2.0
              are on the same network. With 24 bits they are separate.
              Tom Jones
              MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
              PhD, MSc, FIAP, MIITT
              IT Trainer / Consultant
              Ossian Ltd
              Scotland

              ** Remember to give credit where credit is due and leave reputation points where appropriate **

              Comment


              • #8
                Re: Sites and Services

                I'm either tired or not thinking about this right:

                With a /24 subnet mask:
                10.1.1.0, 10.2.1.0, 10.3.1.0, etc. are on the same subnet
                10.1.1.0, 10.1.2.0, 10.1.3.0, etc. are on different subnets

                and so on and so on?

                Comment


                • #9
                  Re: Sites and Services

                  Originally posted by joeqwerty View Post
                  I'm either tired or not thinking about this right:

                  With a /24 subnet mask:
                  10.1.1.0, 10.2.1.0, 10.3.1.0, etc. are on the same subnet
                  10.1.1.0, 10.1.2.0, 10.1.3.0, etc. are on different subnets

                  and so on and so on?
                  No, All are on different subnets with a 24-bit mask
                  16 Bit Mask:
                  10.1.1.0, 10.1.2.0 are on the same subnet
                  10.2.1.0, 10.2.2.0 are in the same subnet (but different to the line above)

                  24 Bit:
                  10.1.1.0
                  10.1.2.0
                  10.2.1.0
                  10.2.2.0
                  are all on different subnets
                  Tom Jones
                  MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
                  PhD, MSc, FIAP, MIITT
                  IT Trainer / Consultant
                  Ossian Ltd
                  Scotland

                  ** Remember to give credit where credit is due and leave reputation points where appropriate **

                  Comment


                  • #10
                    Re: Sites and Services

                    Well then I'm tired AND not thinking about it right.

                    Comment


                    • #11
                      Re: Sites and Services

                      Originally posted by joeqwerty View Post
                      Your subnet mask is wrong. you're using a /24 subnet mask which means that the first three octets are in the same network, so 10.1.0.0, 10.2.0.0, 10.3.0.0, and 10.4.0.0 are all in the same subnet. You probably meant to use a /16 subnet which would mean that 10.1.0.0, 10.2.0.0, 10.3.0.0, and 10.4.0.0 would all be different subnets. The only way to correct this is to change your subnet mask.
                      I think you got Confused with the 8 bit subnet.
                      the subnets are valid and not on the same network.
                      24 bit is for the last part of the IP , e.g 10.1.1.xxx , 10.2.1.xxx
                      with 8 bit Otherwise known as CLASS-A, you are right , it would be on the same network.

                      Comment


                      • #12
                        Re: Sites and Services

                        Originally posted by joeqwerty View Post
                        Was your mistake in Sites and Services or in your post? What is the subnet mask you are using?
                        in my post

                        Comment


                        • #13
                          Re: Sites and Services

                          I know my Sites and Services reflects correctly the IP Subnets.
                          But why does not a machine show up in the correct DC first?

                          Comment


                          • #14
                            Re: Sites and Services

                            What is the primary DNS server for the PC and where are the FSMO roles in this setup?
                            Akila will probably shoot me down for asking irrelevant questions. I'm only guessing here
                            cheers
                            Andy

                            Please read this before you post:


                            Quis custodiet ipsos custodes?

                            Comment


                            • #15
                              Re: Sites and Services

                              Hi,

                              I've come accross a similar problem to yours in: http://www.experts-exchange.com/OS/M..._23767179.html

                              The solutions towards the end of the page indicate it might be a DNS Issue with SRV records (Or at least that's how they resolved their problem by editing the SRV records in DNS.)
                              Hope it helps.
                              Caesar's cipher - 3

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                              SFX JNRS FC U6 MNGR

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