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How do i decrease the speed of 11n to less than that of the AP's physical connection?

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  • 1.  How do i decrease the speed of 11n to less than that of the AP's physical connection?

    Posted May 28, 2014 06:20 AM

    My users laptops are connecting at higher then 100mbps, which is all good but their laptops are choosing this link over their LAN as the switches are only 100mbps, is there a way i can reduse this as the AP's interface is also conencted to a 100mbps port. i would much prefer to use LAN then WLAN when dual homed

     

    Thanks in advance



  • 2.  RE: How do i decrease the speed of 11n to less than that of the AP's physical connection?

    EMPLOYEE
    Posted May 28, 2014 06:34 AM
    There's really no way to do what you are asking. The best solution would be to enable wireless/LAN switching in the BIOS so that only one is active at a time.


  • 3.  RE: How do i decrease the speed of 11n to less than that of the AP's physical connection?

    Posted May 29, 2014 12:08 AM

     

    Will pile on some additional suggestions:

     

    If I remember correctly, OnGuard has a function that allows you to disable wifi if the wired NIC is active.  That's an option if you have ClearPass + OnGuard.

     

    You can manipulate the metric for Window's network connections in the TCP/IP properties.  Not ideal, but I've used this before for dual-connected devices.



  • 4.  RE: How do i decrease the speed of 11n to less than that of the AP's physical connection?

    Posted May 31, 2014 08:39 AM

    you can set the priority of the interfaces in windows 7 at least, see for example:

    http://support.microsoft.com/kb/2526067

    http://levynewsnetwork.wordpress.com/2011/12/01/windows-7-default-internet-connection-choice/

     

     



  • 5.  RE: How do i decrease the speed of 11n to less than that of the AP's physical connection?
    Best Answer

    EMPLOYEE
    Posted May 31, 2014 09:00 AM

    Not to be pushy but like I said before, all you need is to do is have 20 mhz channels enabled on your wireless.  The "route print" command on your Windows PC will tell you the priority of the interfaces.  Here is the association of a Windows 7 device connected to a 40 mhz channel:

    (192.168.1.3) #     show ap association client-mac 84:3a:4b:34:dd:2c

The phy column shows client's operational capabilities for current association

Flags: A: Active, B: Band Steerable, H: Hotspot(802.11u) client, K: 802.11K client, R: 802.11R client, W: WMM client, w: 802.11w client

PHY Details: HT   : High throughput;      20: 20MHz;  40: 40MHz
             VHT  : Very High throughput; 80: 80MHz; 160: 160MHz; 80p80: 80MHz + 80MHz
             <n>ss: <n> spatial streams

Association Table
-----------------
Name        bssid              mac                auth  assoc  aid  l-int  essid     vlan-id  tunnel-id  phy             assoc. time  num assoc  Flags  Band steer moves (T/S)
----        -----              ---                ----  -----  ---  -----  -----     -------  ---------  ---             -----------  ---------  -----  ----------------------
Office-225  9c:1c:12:90:5d:91  84:3a:4b:34:dd:2c  y     y      2    100    ACME-TLS  1        0x10017    a-HT-40sgi-2ss  1m:49s       1          WAB    0/0

..snip

     Here is the ipconfig for that device: .121 is the wireless interface and .92 is the wired.

     

    Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : gateway.2wire.net
   IPv4 Address. . . . . . . . . . . : 192.168.1.121
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : gateway.2wire.net
   IPv4 Address. . . . . . . . . . . : 192.168.1.92
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254

     Below is the route print from the Windows PC, which indicates that Windows will treat both interfaces at the same metric of 20 for the default route 0.0.0.0, which likely will lead to the issue the OP is now experiencing:

    IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0    192.168.1.254    192.168.1.121     20
          0.0.0.0          0.0.0.0    192.168.1.254     192.168.1.92     20
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      192.168.1.0    255.255.255.0         On-link     192.168.1.121    276
      192.168.1.0    255.255.255.0         On-link      192.168.1.92    276
     192.168.1.92  255.255.255.255         On-link      192.168.1.92    276
    192.168.1.121  255.255.255.255         On-link     192.168.1.121    276
    192.168.1.255  255.255.255.255         On-link     192.168.1.121    276
    192.168.1.255  255.255.255.255         On-link      192.168.1.92    276
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link     192.168.1.121    276
        224.0.0.0        240.0.0.0         On-link      192.168.1.92    276
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link     192.168.1.121    276
  255.255.255.255  255.255.255.255         On-link      192.168.1.92    276

     

    Just changing it to 20mhz channels:

    (192.168.1.3) #     show ap association client-mac 84:3a:4b:34:dd:2c

The phy column shows client's operational capabilities for current association

Flags: A: Active, B: Band Steerable, H: Hotspot(802.11u) client, K: 802.11K client, R: 802.11R client, W: WMM client, w: 802.11w client

PHY Details: HT   : High throughput;      20: 20MHz;  40: 40MHz
             VHT  : Very High throughput; 80: 80MHz; 160: 160MHz; 80p80: 80MHz + 80MHz
             <n>ss: <n> spatial streams

Association Table
-----------------
Name        bssid              mac                auth  assoc  aid  l-int  essid     vlan-id  tunnel-id  phy             assoc. time  num assoc  Flags  Band steer moves (T/S)
----        -----              ---                ----  -----  ---  -----  -----     -------  ---------  ---             -----------  ---------  -----  ----------------------
Office-225  9c:1c:12:90:5d:91  84:3a:4b:34:dd:2c  y     y      1    100    ACME-TLS  1        0x10017    a-HT-20sgi-2ss  49s          1          WAB    0/0

..snip

     ...also changes the priority:

     

    C:\Users\cjoseph>route print
..snip

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0    192.168.1.254    192.168.1.121     25
          0.0.0.0          0.0.0.0    192.168.1.254     192.168.1.92     20
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      192.168.1.0    255.255.255.0         On-link     192.168.1.121    281
      192.168.1.0    255.255.255.0         On-link      192.168.1.92    276
     192.168.1.92  255.255.255.255         On-link      192.168.1.92    276
    192.168.1.121  255.255.255.255         On-link     192.168.1.121    281
    192.168.1.255  255.255.255.255         On-link     192.168.1.121    281
    192.168.1.255  255.255.255.255         On-link      192.168.1.92    276
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link     192.168.1.121    281
        224.0.0.0        240.0.0.0         On-link      192.168.1.92    276
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link     192.168.1.121    281
  255.255.255.255  255.255.255.255         On-link      192.168.1.92    276

     the ethernet or .92 priority reduces to 20, so the traffic will always go out that interface.



  • 6.  RE: How do i decrease the speed of 11n to less than that of the AP's physical connection?

    EMPLOYEE
    Posted May 28, 2014 07:52 AM
    @woodyxpd wrote:

    My users laptops are connecting at higher then 100mbps, which is all good but their laptops are choosing this link over their LAN as the switches are only 100mbps, is there a way i can reduse this as the AP's interface is also conencted to a 100mbps port. i would much prefer to use LAN then WLAN when dual homed

     

    Thanks in advance

    You should only use 20mhz channels in the 5ghz spectrum, if that is the case.  If you are using a controller-based AP, the command is:

     

    config t
    rf arm-profile "default"
  40MHz-allowed-bands "None"

     Use the "route print" command on the commandline of  your Windows computer to confirm that the computer will prefer the Wired over the wireless interface.