WLAN and LAN connection on same Laptop

I have encountered this problem that if a laptop is connected to network through ethernet cable and also by Wireless card, it does not work properly (some small disconnections if there is a disruption in wireless signal etc).
Can someone advise me which connection (cable or wireless) gets preferrence when both are available? Is there a way in Windows XP SP2 to select manually which one should have a priority?
Also is there a way that whenever laptop is connected to network via cable, wireless connection should be stopped/disabled automatically and comes back up again automatically when ethernet cable is un-plugged?
Thanks,

Hi,
First of all, in this multi homed configuration, I experience problems with some applications that pass through the 2 interfaces. The outgoing trafic is forwarded by the ethernet interface whereas the incoming trafic from the server income by the wireless interface (usually because of the first DNS entry associated with the IP address of the wireless infrastructure).
What i know is that In windows XP, there is a preemption made for the interfaces based on the throughoutput of each interfaces. That means your 100 Mbit/s Ethernet interface is always prioritized in comparison of the 54 Mbit/s of your wifi connection. (The 802.11n will change this classification !).
But as you see in my experienced case study, the problem is that you don't control by witch interface the incoming trafic is received.
So, the only way i know to resolve the problem is using CSSC (Cisco Secure Service Client) which is a 802.1x client that manage your PC connexions by allowing priotity to interfaces and used of single-homed configuration. It works if all your interfaces are associated with 802.1x connection. Wether, the CSSC client can't manage all the interfaces.
More information with SCCS user guide:
http://www.cisco.com/en/US/customer/products/ps7034/products_user_guide_list.html
Hope it helps you.
Bye.

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I have read a number of articles and it seems that there are a number of people who have problems with DNS and workstations with both WLAN and LAN adapters. I haven't however found workable solutions.
Workstation Connection Objective:
To enable DNS discovery and Ip connection to client workstations regardless of whether the client is using the WLAN or LAN. Enabling users to use either Wireless or LAN adapter adhoc. ie they dock their laptops at their desks, and undock to take their laptops
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Most people seem to try to control which interface is used on the workstations, ie disable WLAN and only use LAN etc. Trying to disable interfaces isn't going to be feasible and its very inflexible.
I believe I can ensure that the workstations use the NICs in our preferred order:
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But how do I solve the DNS resolution for connection to that asset?
If I disable DHCP Server updates into DNS and allow secure updates from the client. It would be really good if DNS client behaved in the following manner
1. The LAN adapter(referred to as primary ie LAN) with the lowest metric(ie 1) registers/auto updates DNS with the ip(both A and PTR). Any other Adapters don't register. - ie the WLAN
2. The Laptop is undocked and the LAN adapter goes offline, the DNS Client then triggers a registration/auto updates its existing DNS entry with the ip from the next adapter(WLAN) with the next lowest gateway metric(2)...hence replacing the first ip registered.
3. The laptop is docked again, and DNS Client triggers a registration/auto updates its existing DNS entry with the IP from the primary adapter(LAN), replacing the WLAN ip.
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Being able to discover and communicate with all our workstations in our sites is crucial requirement....
This microsoft article says, http://technet.microsoft.com/en-gb/library/cc771255.aspx
Dynamic updates can be sent for any of the following reasons or events:
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    * An IP address lease changes or renews with the DHCP server any one of the installed network connections. For example, when the computer is started or if the ipconfig /renew command is used.
    * The ipconfig /registerdns command is used to manually force a refresh of the client name registration in DNS.
    * At startup time, when the computer is turned on.
    * A member server is promoted to a domain controller.
However from what I am reading, both adapters(LAN,WLAN), if configured to update DNS, will register their Ip addresses. Which leads to an invalid DNS entry if the laptop is undocked, as the IP for LAN adapter isn't removed.
Has anyone solved this problem for their organizations without
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2. Only allowing one adapter to register with DNS
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   - If using the WLAN, then we would have to invest a large amount of money into Wireless to provide the necessary bandwidth
3. Setting GPO's to configure dns updates every 30mins on clients
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4. Defining separate DNS suffixes for their WLAN networks (I read some people did this)
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Hi,
From my point of view, DNS can't be so smart.
As a workaround, please try the steps below,
Disable the DNS register of wireless adapter
Put "ipconfig /regiserdns" in a bat file
Everytime when the wired network is undocked, run the bat file.
If the wired network is docked, wired adapter will register the DNS record.
When the wired network is undocked, run the bat file, then the wireless adapter will register the DNS record.
If the wired network is docked again, wired adapter will register the DNS record automatically.
Best Regards.
Steven Lee
TechNet Community Support

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user454720 wrote:
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WLAN and LAN connection on same Laptop

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