Increase Addresses

Discussion in 'Server Networking' started by Stonecold316, Aug 15, 2005.

  1. Stonecold316

    Stonecold316 Guest

    We currently have a scope of 192.168.1.x-192.168.2.254 with a mask of
    255.255.254.0 .DHCP server is on .0 and our router is on .1 We want to
    increase our address due to more devices being added to the network By adding
    a .2 and .3 to the scope. I tried to delete the current scope and recreate it
    192.168.1.x-192.168.3.254 with a mask of 255.255.254.0. . We were able to
    obtain and IP from the .2 but could not ping or resolve and address on the
    network. I reverted back to the original config for now. Any help would be
    greatly welcomed
     
    Stonecold316, Aug 15, 2005
    #1
    1. Advertisements

  2. Stonecold316

    Neteng Guest

    Check your subnet masks.
     
    Neteng, Aug 15, 2005
    #2
    1. Advertisements

  3. Stonecold316

    Stonecold316 Guest

    What should the mask be. I plan on removing the curretn scope and recreating
    as 192.168.0.x-192.168.3.x What should the mask be
     
    Stonecold316, Aug 15, 2005
    #3
  4. Stonecold316

    Neteng Guest

    Network Subnet Mask #Hosts Host Range
    Broadcast
    510 Hosts
    192.168.0.0 255.255.254.0 510 192.168.0.1 to 192.168.1.254
    192.168.1.255

    1022 Hosts
    192.168.0.0 255.255.252.0 1022 192.168.0.1 to 192.168.3.254
    192.168.3.255

    I would highly suggest using multiple Class C's and separate with a router.
    Any more than 250 devices on a segment and performance blows.
     
    Neteng, Aug 15, 2005
    #4
  5. Stonecold316

    Stonecold316 Guest

    Slight config error in original post we currently have
    192.168.0.1-192.168.1.254 with a mask of 255.255.254.0 DHCP server is
    192.168.0.100. We have a router configured with 192.168.1.254 and also our
    default gateway. Do we need an addition router to perform this task. scope
    changes.
     
    Stonecold316, Aug 15, 2005
    #5
  6. Stonecold316

    Neteng Guest

    If your increasing the subnet, you do not need another router. You will have
    to change the subnet mask on every device though.
     
    Neteng, Aug 15, 2005
    #6
  7. I didn't post earlier,..but the whole thing is a bad idea from the
    beginning. You should keep the number of Hosts per segment down below 300.
    A straight 24bit mask does this fine. You should divide the system up into
    254-host subnets (24bit mask) and use a LAN Router or Layer3 Switch between
    the segments.

    --
    Phillip Windell [MCP, MVP, CCNA]
    www.wandtv.com
    -----------------------------------------------------
    Understanding the ISA 2004 Access Rule Processing
    http://www.isaserver.org/articles/ISA2004_AccessRules.html

    Microsoft Internet Security & Acceleration Server: Guidance
    http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
    http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

    Microsoft Internet Security & Acceleration Server: Partners
    http://www.microsoft.com/isaserver/partners/default.asp
     
    Phillip Windell, Aug 15, 2005
    #7
  8. Stonecold316

    Stonecold316 Guest

    -----Router 192.168.1.254 255.255.254.0-------
    -----------switch----------
    ^
    ----192.168.0.x-----------------192.168.1.x
    ^
    DHCP Server 192.168.0.100 255.255.254.0 Default gateway
    192.168.1.254
    Current Scope 192.168.0.1-192.168.1.254
    So you are saying 4 seperate scopes
    192.168.0.x 255.255.255.0
    192.168.1.x 255.255.255.0
    192.168.2.x 255.255.255.0
    192.168.3.x 255.255.255.0
    And change the router to 192.168.1.254 255.255.255.0 ?


     
    Stonecold316, Aug 16, 2005
    #8
  9. Stonecold316

    Neteng Guest

    No, You need a router that has four LAN interfaces, each one having a
    different subnet. For example eth0 is 192.168.0.0, eth1 is 192.168.1.0, etc.
    For devices on one subnet to talk to devices on another subnet, it has to go
    through the router.


     
    Neteng, Aug 16, 2005
    #9
  10. Stonecold316

    Stonecold316 Guest

    OK I can deal with that but can you answer how the curretn scope
    works(192.168.0.1-192.168.1.254/23 when there is only one interface on the
    router(192.168.1.254) and no .0 routers?

     
    Stonecold316, Aug 16, 2005
    #10
  11. Stonecold316

    Stonecold316 Guest

    I found that from the router it connects to a swicth(GB) which is also
    chained to other switches. All clients are currently all connect through
    these switches/hubs

     
    Stonecold316, Aug 16, 2005
    #11
  12. Stonecold316

    Neteng Guest

    Sure. All your devices (including the router) fall in your subnet range of
    valid address. Your valid host range is 192.168.0.1-192.168.1.254, this is
    one subnet. What your doing is commonly referred to as supernetting. Let's
    look at an example:

    192.168.0.1 255.255.255.0
    192.168.1.1 255.255.255.0

    These two subnets are each a class C. For one to talk to the other a router
    would need to be in between. But we don't have a router and I need more than
    254 addresses on my network. What are my options? Use a Class B address with
    a default or adjusted mask or we can supernet the two class C networks
    together. Instead of the subnet mask of /24 we move the bit to the left.
    This increases the number of host available on that subnet.

    Our network ID is 192.168.0.0
    Subnet Mask is 255.255.254.0
    Number of hosts is 510
    Our host range is 192.168.0.1 to 192.168.1.254

    Basically we 'merged' the two Class C networks together and formed a bigger
    one (by changing the subnet mask).

    Now I want to converge the following subnets:

    192.168.0.0
    192.168.1.0
    192.168.2.0
    192.168.3.0

    What should the subnet mask be?
    255.255.255.252

    Our network ID is 192.168.0.0
    Subnet Mask is 255.255.252.0
    Number of hosts is 1022
    Our host range is 192.168.0.1 to 192.168.3.254

    Again this one large network that encompasses four Class C networks.

    To answer your questions; even though you have multiple "networks" they are
    all encompassed by the subnet mask. You don't need a router on each
    "network" because the subnet mask has changed it into one large network.



     
    Neteng, Aug 16, 2005
    #12
  13. Stonecold316

    Stonecold316 Guest

    Thank you very much one last thing to make sure i have it, you state
    255.255.255.252 mask but in next section stated 255.255.252.0. Which is
    correct
     
    Stonecold316, Aug 16, 2005
    #13
  14. Stonecold316

    Neteng Guest

    oops should have been 255.255.252.0

     
    Neteng, Aug 16, 2005
    #14
  15. Stonecold316

    Stonecold316 Guest

    thank you very much. Do I need to change my mask on the router to?
    When I tried it before I could get and ip address on the client 192.168.2.x
    or 3.x but could not connect to any resources.

     
    Stonecold316, Aug 16, 2005
    #15
  16. Stonecold316

    Neteng Guest

    The subnet mask will have to change on ALL devices. Easily done with DHCP,
    but for static address (router/servers/printers) it will have to be done
    manually.

     
    Neteng, Aug 16, 2005
    #16
  17. There wouldn't be so much confusion if you did it like I suggested with
    straight normal 24bit masks.

    --
    Phillip Windell [MCP, MVP, CCNA]
    www.wandtv.com
    -----------------------------------------------------
    Understanding the ISA 2004 Access Rule Processing
    http://www.isaserver.org/articles/ISA2004_AccessRules.html

    Microsoft Internet Security & Acceleration Server: Guidance
    http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
    http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

    Microsoft Internet Security & Acceleration Server: Partners
    http://www.microsoft.com/isaserver/partners/default.asp
    -----------------------------------------------------


     
    Phillip Windell, Aug 16, 2005
    #17
  18. Stonecold316

    Neteng Guest

    1. Maybe he will do that (like I suggested as well)
    2. Maybe he wants to learn
    3. Maybe he has to have a subnet larger than a /24
    4. Maybe your way isn't the right way every time

     
    Neteng, Aug 17, 2005
    #18
  19. Then he should indicate the need for that so we know what the system
    requirements are so we aren't just "guessing". It is the "guessing" about
    networks we can't see and have no background knowledge about (but still
    expected to help fix) that make me "irritable" at times.
    I've never claimed that,...and we've both been in this group long enough for
    you to already know that and not imply that I think that. I always give what
    I believe is both the most "straight forward" and "simplest" solution
    according to "common" industry standards. I can't give every possible
    solution in a simple email and would never want to try.

    --
    Phillip Windell [MCP, MVP, CCNA]
    www.wandtv.com
    -----------------------------------------------------
    Understanding the ISA 2004 Access Rule Processing
    http://www.isaserver.org/articles/ISA2004_AccessRules.html

    Microsoft Internet Security & Acceleration Server: Guidance
    http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
    http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

    Microsoft Internet Security & Acceleration Server: Partners
    http://www.microsoft.com/isaserver/partners/default.asp
    -----------------------------------------------------
     
    Phillip Windell, Aug 17, 2005
    #19
  20. Stonecold316

    Stonecold316 Guest

    ok, lets not argue. i am not new to this but the reuirements handed done to
    to do with what we have I have never done before. That is expand our
    existing scope 192.168.0.1-192.168.1.254 255.255.254.0 to incorporate 2 new
    ranges 192.168.2.x and 192.168.3.x we need to add the new ranges to cover
    alot of standalone devices, not pcs being put in. Right now the current scope
    house static and dhcp , I want to make .0 and .1 strictly static as well .2
    straight dhcp and .3 half dhcp and half static. Tonite I am going to delete
    current scope and recreate as 192.168.0.1-192.168.3.254 255.255.252.0 and
    change the router subnet and see what happens. Thank you for all the help you
    2 have given me.

     
    Stonecold316, Aug 17, 2005
    #20
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.