multiple DSL lines for single infrastructure

Discussion in 'Cisco' started by Phil Schuman, Mar 16, 2005.

  1. Phil Schuman

    Phil Schuman Guest

    A friend with a small biz called and asked me a question
    about how he can increase bandwidth by adding a 2nd DSL line.

    He has a single DSL line, with a wireless router for laptops,
    and a 24-port switch for the office hardwired desktops.
    He wants to increase bandwidth by adding a 2nd DSL line,
    along with a 2nd wireless router.

    Now - the question - how to setup the infrastructure -

    Each wireless router will have a different SSID - so that is ok -
    BUT - how to handle the IP addressing between the 2 DSL routers...
    THINKING - split the single wireless router subnet,
    into two wireless router subnets - 192.168.10.x and 192.168.20.x

    HOWEVER -
    Can they both co-exist on the same Ethernet physical network
    and go thru the same Ethernet switch ?

    Each PC/laptop GW will point to each subnet's router,
    so that should be ok -

    But - since they are on the same "physical network"
    if I wanted to talk from a PC or laptop on .10 to a printer on .20
    will ARP's from the .20 have been recorded by the .10 PC,
    or am I always forced to go to the GW router for resolution.
    And, if I go to the router, will they have "seen" each others address,
    or will I need to manually add a static address for each other's subnet
    ?

    tnx for the discussion, comments, education -


    DSL line #1 DSL line #2
    DSL modem #1 DSL modem #2
    Wireless router (.10.1) Wireless router (.20.1)
    |
    |
    |----------->>> single switch <<<<---------|
    |
    |
    192.168.10.100 192.168.20.100
    192.168.10.101 192.168.20.101
    GW = 192.168.10.1 GW = 192.168.20.1
     
    Phil Schuman, Mar 16, 2005
    #1
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  2. Phil Schuman

    J. Clarke Guest

    Froogle "load balancing router". It sounds like you're drastically
    overcomplicating something that should be fairly simple to do.
     
    J. Clarke, Mar 16, 2005
    #2
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  3. From: "Phil Schuman" <>

    | A friend with a small biz called and asked me a question
    | about how he can increase bandwidth by adding a 2nd DSL line.
    |
    | He has a single DSL line, with a wireless router for laptops,
    | and a 24-port switch for the office hardwired desktops.
    | He wants to increase bandwidth by adding a 2nd DSL line,
    | along with a 2nd wireless router.
    |
    | Now - the question - how to setup the infrastructure -
    |
    | Each wireless router will have a different SSID - so that is ok -
    | BUT - how to handle the IP addressing between the 2 DSL routers...
    | THINKING - split the single wireless router subnet,
    | into two wireless router subnets - 192.168.10.x and 192.168.20.x
    |
    | HOWEVER -
    | Can they both co-exist on the same Ethernet physical network
    | and go thru the same Ethernet switch ?
    |
    | Each PC/laptop GW will point to each subnet's router,
    | so that should be ok -
    |
    | But - since they are on the same "physical network"
    | if I wanted to talk from a PC or laptop on .10 to a printer on .20
    | will ARP's from the .20 have been recorded by the .10 PC,
    | or am I always forced to go to the GW router for resolution.
    | And, if I go to the router, will they have "seen" each others address,
    | or will I need to manually add a static address for each other's subnet
    | ?
    |
    | tnx for the discussion, comments, education -
    |
    | DSL line #1 DSL line #2
    | DSL modem #1 DSL modem #2
    | Wireless router (.10.1) Wireless router (.20.1)
    |>
    |> ----------->>> single switch <<<<---------|
    |>
    | 192.168.10.100 192.168.20.100
    | 192.168.10.101 192.168.20.101
    | GW = 192.168.10.1 GW = 192.168.20.1
    |


    Your friend needs to double the DSL bandwidth and not get two DSL lines and really should be
    SDSL rather than ADSL which he probably has. He will not double his bandwidth effectively
    with two xDSL lines and two wireless Routers.

    If the person really wants to xDSL lines tthen what is really needed is a Load Balanced
    Router that has two WAN ports such as the Edimax PermaLink PRI-682
    http://www.edimax.com/html/english/products/PRI682.htm
     
    David H. Lipman, Mar 16, 2005
    #3
  4. Phil Schuman

    Phil Schuman Guest

    tnx for the comments about a dual port WAN router...
    We'll have to look into those, but then how is the price,
    and does each WAN port directly support DSL/PPPoE, etc ?
    Here was another network design that I thought off....

    Instead of having 2 subnets, and then having to setup a route between
    them,
    why not just keep ONE subnet, as the problem is just with the GW address
    to force 1/2 the traffic to each DSL line.... yeah, not load balanced,
    but cheap :)
    I wonder if this will work.... 192.168.1.xxx 255.255.255.0
    Take each router, and setup it's DHCP with a limited number of addresses
    (1/2 of the total), and with a unique range .100-.110 and .200-.210, but
    on the same subnet. Then, both will reply to any subnet DHCP request,
    and maybe 1/2 will be satisfied by each router. If not, then at least a
    stop-gap measure will be that each router will only serve up 1/2 of the
    PC's used. So, if say 20 PC's all try to get DHCP served, then 10 should
    be "forced" to each router by the limited DHCP reply and it's associated
    DHCP info (address, DNS, GW address).
    thoughts ?
     
    Phil Schuman, Mar 18, 2005
    #4
  5. Phil Schuman

    J. Clarke Guest

    $150 and up.
    Yes. They're designed specifically for that purpose.
    That's not going to force traffic to either line, it's just going to give
    you messy DHCP. to make it work, you will probably need to lock IP
    addresses to MAC addresses, which pretty much defeats the purpose of DHCP.
     
    J. Clarke, Mar 18, 2005
    #5
  6. Phil Schuman

    Phil Schuman Guest

    If 10 PCs receive the GW address as 192.168.1.1
    and 10 PCs receive the GW address as 192.168.1.2
    then each "logical group" will use "their" GW and DSL line.
    Yeah - it's not load balanced, but merely spliting
    the infrastructure between 2 lines - a roll of the DHCP dice -
    I know multiple GWs work, as we did it with our T1s and ISDN,
    and also used multiple DHCP servers - with non-overlapping scopes.
     
    Phil Schuman, Mar 19, 2005
    #6
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