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Thread: Adding subnets to sites and services

  1. #1
    Mike L Guest

    Adding subnets to sites and services

    I have a question that is specific to adding a new subnet. In this scenario
    we are adding a 10.54.3.0 /25. What I would like clarified is should the
    subnet be set with 10.54.3.128 because of the /25 bit SM or can I define it
    as 10.54.3.0 /25? Reason for the question is it was brought up today as we
    are re-iping some of our sites. I was under the impression that you could use
    10.54.3.0 /25 and the .0 would cover everything that is in the .3 net? So
    another scenario would be 10.54.3.0 /26, is this correct or does it need to
    be 10.54.3.64 because of the /26? I found a little information on the web but
    nothing that came out and said this is the way it should or should not be.
    Any help is appreciated and hopefully someone can give a good explanation,
    thanks!

  2. #2
    Marcin Guest

    Re: Adding subnets to sites and services

    Mike
    as per the CIDR notation, which is used in this case, 10.54.3.0/25 and
    10.54.3.128/25 designate two separate IP address ranges. If each of them is
    supposed to be allocated to a distinct site, then you should be specific and
    assign them accordingly - otherwise (if both of them are part of the same
    site), you can simply use 10.54.3.0/24...

    hth
    Marcin

    "Mike L" <MikeL@discussions.microsoft.com> wrote in message
    news:1238DDB7-C4A7-402D-B495-725D86B7B6C0@microsoft.com...
    >I have a question that is specific to adding a new subnet. In this scenario
    > we are adding a 10.54.3.0 /25. What I would like clarified is should the
    > subnet be set with 10.54.3.128 because of the /25 bit SM or can I define
    > it
    > as 10.54.3.0 /25? Reason for the question is it was brought up today as we
    > are re-iping some of our sites. I was under the impression that you could
    > use
    > 10.54.3.0 /25 and the .0 would cover everything that is in the .3 net? So
    > another scenario would be 10.54.3.0 /26, is this correct or does it need
    > to
    > be 10.54.3.64 because of the /26? I found a little information on the web
    > but
    > nothing that came out and said this is the way it should or should not be.
    > Any help is appreciated and hopefully someone can give a good explanation,
    > thanks!




  3. #3
    Mike L Guest

    Re: Adding subnets to sites and services

    Hey Marcin thanks for the reply! Just want to clarify a couple of things. The
    servers at this site will have a 10.54.3.x address with a 255.255.255.128
    SM. So if a node has this setup doesn't sites and services need the subnet
    entry 10.54.3.0 /25 in order to route their DC requests to the correct site?
    Below you state that you can use a 3.0 /24 instead, will this cover all
    setups (/26 /27 /28 etc.) if its the same site? I have always entered in
    subnets with an IP address that ends in .0 with whatever the SM of the site
    is. Thanks and have a good one!


    "Marcin" wrote:

    > Mike
    > as per the CIDR notation, which is used in this case, 10.54.3.0/25 and
    > 10.54.3.128/25 designate two separate IP address ranges. If each of them is
    > supposed to be allocated to a distinct site, then you should be specific and
    > assign them accordingly - otherwise (if both of them are part of the same
    > site), you can simply use 10.54.3.0/24...
    >
    > hth
    > Marcin
    >
    > "Mike L" <MikeL@discussions.microsoft.com> wrote in message
    > news:1238DDB7-C4A7-402D-B495-725D86B7B6C0@microsoft.com...
    > >I have a question that is specific to adding a new subnet. In this scenario
    > > we are adding a 10.54.3.0 /25. What I would like clarified is should the
    > > subnet be set with 10.54.3.128 because of the /25 bit SM or can I define
    > > it
    > > as 10.54.3.0 /25? Reason for the question is it was brought up today as we
    > > are re-iping some of our sites. I was under the impression that you could
    > > use
    > > 10.54.3.0 /25 and the .0 would cover everything that is in the .3 net? So
    > > another scenario would be 10.54.3.0 /26, is this correct or does it need
    > > to
    > > be 10.54.3.64 because of the /26? I found a little information on the web
    > > but
    > > nothing that came out and said this is the way it should or should not be.
    > > Any help is appreciated and hopefully someone can give a good explanation,
    > > thanks!

    >
    >
    >


  4. #4
    Meinolf Weber Guest

    Re: Adding subnets to sites and services

    Hello Mike,

    You have to add the subnets to ADSS if the new subnet is behind a router
    to router(WAN) connection. Otherwise they belong to the same site.

    Best regards

    Meinolf Weber
    Disclaimer: This posting is provided "AS IS" with no warranties, and confers
    no rights.
    ** Please do NOT email, only reply to Newsgroups
    ** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm


    > I have a question that is specific to adding a new subnet. In this
    > scenario we are adding a 10.54.3.0 /25. What I would like clarified is
    > should the subnet be set with 10.54.3.128 because of the /25 bit SM or
    > can I define it as 10.54.3.0 /25? Reason for the question is it was
    > brought up today as we are re-iping some of our sites. I was under the
    > impression that you could use 10.54.3.0 /25 and the .0 would cover
    > everything that is in the .3 net? So another scenario would be
    > 10.54.3.0 /26, is this correct or does it need to be 10.54.3.64
    > because of the /26? I found a little information on the web but
    > nothing that came out and said this is the way it should or should not
    > be. Any help is appreciated and hopefully someone can give a good
    > explanation, thanks!
    >




  5. #5
    Marcin Guest

    Re: Adding subnets to sites and services

    Mike,
    you should be able to combine multiple "classless" subnets when defining AD
    site coverage (i.e. use 10.54.3.0/24 instead of having two entries that
    cover the same IP address range - 10.54.3.0/25 and 10.54.3.128/25)...

    hth
    Marcin

    "Mike L" <MikeL@discussions.microsoft.com> wrote in message
    news:707AB197-78AB-42AF-A950-1F8F89DF9470@microsoft.com...
    > Hey Marcin thanks for the reply! Just want to clarify a couple of things.
    > The
    > servers at this site will have a 10.54.3.x address with a 255.255.255.128
    > SM. So if a node has this setup doesn't sites and services need the subnet
    > entry 10.54.3.0 /25 in order to route their DC requests to the correct
    > site?
    > Below you state that you can use a 3.0 /24 instead, will this cover all
    > setups (/26 /27 /28 etc.) if its the same site? I have always entered in
    > subnets with an IP address that ends in .0 with whatever the SM of the
    > site
    > is. Thanks and have a good one!
    >
    >
    > "Marcin" wrote:
    >
    >> Mike
    >> as per the CIDR notation, which is used in this case, 10.54.3.0/25 and
    >> 10.54.3.128/25 designate two separate IP address ranges. If each of them
    >> is
    >> supposed to be allocated to a distinct site, then you should be specific
    >> and
    >> assign them accordingly - otherwise (if both of them are part of the same
    >> site), you can simply use 10.54.3.0/24...
    >>
    >> hth
    >> Marcin
    >>
    >> "Mike L" <MikeL@discussions.microsoft.com> wrote in message
    >> news:1238DDB7-C4A7-402D-B495-725D86B7B6C0@microsoft.com...
    >> >I have a question that is specific to adding a new subnet. In this
    >> >scenario
    >> > we are adding a 10.54.3.0 /25. What I would like clarified is should
    >> > the
    >> > subnet be set with 10.54.3.128 because of the /25 bit SM or can I
    >> > define
    >> > it
    >> > as 10.54.3.0 /25? Reason for the question is it was brought up today as
    >> > we
    >> > are re-iping some of our sites. I was under the impression that you
    >> > could
    >> > use
    >> > 10.54.3.0 /25 and the .0 would cover everything that is in the .3 net?
    >> > So
    >> > another scenario would be 10.54.3.0 /26, is this correct or does it
    >> > need
    >> > to
    >> > be 10.54.3.64 because of the /26? I found a little information on the
    >> > web
    >> > but
    >> > nothing that came out and said this is the way it should or should not
    >> > be.
    >> > Any help is appreciated and hopefully someone can give a good
    >> > explanation,
    >> > thanks!

    >>
    >>
    >>




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