Re: With both wireless & ethernet connected, which connection does Windows use?

Discussion in 'Wireless Networking' started by Judy Zappacosta, Apr 21, 2010.

  1. On Wed, 21 Apr 2010 12:52:20 GMT, AnthonyL wrote:

    >>When a WinXP computer has both a wireless connection (54 Mbps) and an
    >>ethernet connection (100 Mbps), how does Windows choose which connection to
    >>actually use?


    > Go to the command prompt and type Route Print

    See the "route print" below.
    It's kind of hard to understand.
    There are multiple "25" metrics.
    Which one does it use?
    Lan or Wan?

    Microsoft Windows XP [Version 5.1.2600]
    (C) Copyright 1985-2001 Microsoft Corp.

    C:\>route print
    ===========================================================================
    Interface List
    0x1 ........................... MS TCP Loopback interface
    0x2 ...00 22 14 ac 03 28 ...... Broadcom 440x 10/100 Integrated Controller
    - Pac
    ket Scheduler Miniport
    0x3 ...00 6f 16 95 bc 9e ...... Intel(R) PRO/Wireless 2200BG Network
    Connection
    - Packet Scheduler Miniport
    ===========================================================================
    ===========================================================================
    Active Routes:
    Network Destination Netmask Gateway Interface
    Metric
    0.0.0.0 0.0.0.0 192.168.1.40 192.168.1.102 25
    0.0.0.0 0.0.0.0 192.168.1.40 192.168.1.101 20
    192.168.1.0 255.255.255.0 192.168.1.101 192.168.1.101 20
    192.168.1.0 255.255.255.0 192.168.1.102 192.168.1.102 25
    192.168.1.101 255.255.255.255 127.0.0.1 127.0.0.1 20
    192.168.1.102 255.255.255.255 127.0.0.1 127.0.0.1 25
    192.255.255.255 255.255.255.255 192.168.1.101 192.168.1.101 20
    192.255.255.255 255.255.255.255 192.168.1.102 192.168.1.102 25
    127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
    224.0.0.0 240.0.0.0 192.168.1.101 192.168.1.101 20
    224.0.0.0 240.0.0.0 192.168.1.102 192.168.1.102 25
    255.255.255.255 255.255.255.255 192.168.1.101 192.168.1.101 1
    255.255.255.255 255.255.255.255 192.168.1.102 192.168.1.102 1
    Default Gateway: 192.168.1.40
    ===========================================================================
    Persistent Routes:
    None
    Judy Zappacosta, Apr 21, 2010
    #1
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  2. Judy Zappacosta

    DevilsPGD Guest

    In message <> Judy Zappacosta
    <> was claimed to have wrote:

    >
    >On Wed, 21 Apr 2010 12:52:20 GMT, AnthonyL wrote:
    >
    >>>When a WinXP computer has both a wireless connection (54 Mbps) and an
    >>>ethernet connection (100 Mbps), how does Windows choose which connection to
    >>>actually use?

    >
    >> Go to the command prompt and type Route Print

    >See the "route print" below.
    >It's kind of hard to understand.
    >There are multiple "25" metrics.
    >Which one does it use?
    >Lan or Wan?
    >
    >===========================================================================
    >Active Routes:
    >Network Destination Netmask Gateway Interface
    >Metric
    > 0.0.0.0 0.0.0.0 192.168.1.40 192.168.1.102 25
    > 0.0.0.0 0.0.0.0 192.168.1.40 192.168.1.101 20
    > 192.168.1.0 255.255.255.0 192.168.1.101 192.168.1.101 20
    > 192.168.1.0 255.255.255.0 192.168.1.102 192.168.1.102 25
    > 192.168.1.101 255.255.255.255 127.0.0.1 127.0.0.1 20
    > 192.168.1.102 255.255.255.255 127.0.0.1 127.0.0.1 25
    > 192.255.255.255 255.255.255.255 192.168.1.101 192.168.1.101 20
    > 192.255.255.255 255.255.255.255 192.168.1.102 192.168.1.102 25
    > 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
    > 224.0.0.0 240.0.0.0 192.168.1.101 192.168.1.101 20
    > 224.0.0.0 240.0.0.0 192.168.1.102 192.168.1.102 25
    > 255.255.255.255 255.255.255.255 192.168.1.101 192.168.1.101 1
    > 255.255.255.255 255.255.255.255 192.168.1.102 192.168.1.102 1
    >Default Gateway: 192.168.1.40
    >===========================================================================


    There aren't any duplicated routes with the same metric here, but
    rather, you have two almost identical routing options for any particular
    destination, one with a metric of 20 and the other with a metric of 25.

    The only routes that aren't exactly duplicated are the 192.168.1.101 and
    192.168.1.102 routes which are routed as loopback addresses.

    Since 20 wins over 25, 192.168.1.101 will be the default interface.
    DevilsPGD, Apr 22, 2010
    #2
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  3. Judy Zappacosta

    bod43 Guest

    Re: With both wireless & ethernet connected, which connection doesWindows use?

    On 22 Apr, 02:52, DevilsPGD <>
    wrote:
    > In message <> Judy Zappacosta
    > <> was claimed to have wrote:
    >
    >
    >
    >
    >
    > >On Wed, 21 Apr 2010 12:52:20 GMT, AnthonyL wrote:

    >
    > >>>When a WinXP computer has both a wireless connection (54 Mbps) and an
    > >>>ethernet connection (100 Mbps), how does Windows choose which connection to
    > >>>actually use?

    >
    > >> Go to the command prompt and type Route Print

    > >See the "route print" below.
    > >It's kind of hard to understand.
    > >There are multiple "25" metrics.
    > >Which one does it use?
    > >Lan or Wan?

    >
    > >===========================================================================
    > >Active Routes:
    > >Network Destination        Netmask          Gateway       Interface
    > >Metric
    > >           0.0.0.0          0.0.0.0      192.168.1.40    192.168.1.102  25
    > >           0.0.0.0          0.0.0.0      192.168.1.40    192.168.1.101  20
    > >       192.168.1.0    255.255.255.0     192.168.1.101    192.168.1.101  20
    > >       192.168.1.0    255.255.255.0     192.168.1.102    192.168.1.102  25
    > >     192.168.1.101  255.255.255.255        127.0.0.1       127.0.0.1    20
    > >     192.168.1.102  255.255.255.255        127.0.0.1       127.0.0.1    25
    > >   192.255.255.255  255.255.255.255     192.168.1.101    192..168.1.101  20
    > >   192.255.255.255  255.255.255.255     192.168.1.102    192..168.1.102  25
    > >         127.0.0.0        255.0.0.0        127.0..0.1       127.0.0.1    1
    > >         224.0.0.0        240.0.0.0     192.168.1.101    192.168.1.101  20
    > >         224.0.0.0        240.0.0.0     192.168.1.102    192.168.1.102  25
    > >   255.255.255.255  255.255.255.255     192.168.1.101    192..168.1.101  1
    > >   255.255.255.255  255.255.255.255     192.168.1.102    192..168.1.102  1
    > >Default Gateway:       192.168.1.40
    > >===========================================================================

    >
    > There aren't any duplicated routes with the same metric here, but
    > rather, you have two almost identical routing options for any particular
    > destination, one with a metric of 20 and the other with a metric of 25.
    >
    > The only routes that aren't exactly duplicated are the 192.168.1.101 and
    > 192.168.1.102 routes which are routed as loopback addresses.
    >
    > Since 20 wins over 25, 192.168.1.101 will be the default interface.


    You can chose which interface to use:-
    http://support.microsoft.com/kb/894564

    The only entries that are particularly relevant
    are the top four.

    The top two determine which interfaces are used for
    traffic sent to your router, the next two are for
    local traffic to PCs on your local network.
    In both cases interface 192.168.1.101
    is being used since the metric is 20 which is better
    than 25.

    Just ignore the rest, it is only there to confuse you:)
    bod43, Apr 22, 2010
    #3
  4. Judy Zappacosta

    Char Jackson Guest

    Re: With both wireless & ethernet connected, which connection does Windows use?

    On Thu, 22 Apr 2010 20:21:16 +0000 (UTC), Judy Zappacosta
    <> wrote:

    >On Thu, 22 Apr 2010 08:08:39 -0700 (PDT), bod43 wrote:
    >
    >> The top two determine which interfaces are used for
    >> traffic sent to your router,

    >
    >I first ran an "ipconfig /all" which defined the LAN at 192.168.1.101 and
    >the WAN at 192.168.1.102.


    The ipconfig command doesn't tell you that. It tells you the IP
    address assigned to each network interface, their respective subnet
    masks, gateways, and DNS servers.

    What you found is that one of your network interfaces is assigned the
    IP address 192.168.1.101 and the other network interface is assigned
    the IP address 192.168.1.102.

    LAN = local area network, the network on your side of the router.
    WAN = wide area network, everything on the other side of the router.

    >Then I ran a "route /print" which reported the 192.168.1.101 metric cost
    >was 20 and the 192.168.1.102 metric cost was 25.


    The command is simply "route print", not "route /print", but you got
    it right since you saw the metrics.

    >So, given your information, I can conclude the WinXP PC is using the LAN
    >which has a lower metric cost than the WAN.


    LAN and WAN are again misused here, but you're correct that one
    interface (with the lower metric) is given priority over the other
    interface (with the higher metric).

    >Is a "20" a "decent" metric cost?


    The actual metric values are unimportant. The important thing is their
    values relative to each other.
    Char Jackson, Apr 23, 2010
    #4
  5. Judy Zappacosta

    Char Jackson Guest

    Re: With both wireless & ethernet connected, which connection does Windows use?

    On Fri, 23 Apr 2010 04:22:59 +0000 (UTC), Judy Zappacosta
    <> wrote:

    >On Thu, 22 Apr 2010 19:18:43 -0500, Char Jackson wrote:
    >
    >>>Is a "20" a "decent" metric cost?

    >> The actual metric values are unimportant. The important thing is their
    >> values relative to each other.

    >
    >I was accidentally using WAN to mean the wireless area network and the LAN
    >to be the wired network but I do see what you mean.
    >
    >So this seems to work to tell which network interface card is being used
    >when there are more than one network interface cards:
    >
    >(1) Run "ipconfig /all" to figure out which network interface card is
    >associated with each IP address


    Good.

    >(2) Run "route print" to figure out which IP address has the lowest metric
    >(the first two lines of the output).


    Good.

    >(3) The IP address with the lowest metric is the one being used; the other
    >IP address is not being used.


    I'd rewrite that to say, "The network interface with the lowest metric
    is the one being used by default." Other network interface(s) would be
    used if specific route statements apply to them.

    >Did I get it right this time?


    Very good.
    Char Jackson, Apr 23, 2010
    #5
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