Hello:

If a computer has both wireless and hardwired Ethernet cards, how does one choose to send info by choosing one against another?

E.g:

• This specific PC runs DAQ via a LabVIEW TCP/IP application over a hard wired ethernet port with a static peer-to-peer address. The static address is set as: 192.168.#.#

• But then, access is also available via the wireless modem. This same computer does in fact allow web browsing using the internet wire-less link.

My question is: I need to create a program that will choose to link via the wireless internet connection to access a remote internet server machine rather than the hardwired connection. So, how does one choose one option versus the other when both are active?

Otherwise, is it safe to assume that if you enter the address: 192.168.#.# then the peer-to-peer network port will be used and that if the address is something like: 116.135.9.11 then the wireless internet connection will be selected automatically?


Thanks

Anthony

This post has been edited by alukindo: Oct 3 2008, 07:05 PM

Try searching and reading about routing tables. Essentially, which adapter to use is determined by the settings (e.g. the network mask), but if the adapters overlap, I'm not sure you can control this. At most, I believe you can call some Windows functions to change the priorities.

Hi Anthony,

I had to deal with this in the past and I went back to the help to find the answer again:

TCPIP INSTR TCPIP[board]::host address[::LAN device name][::INSTR] TCP/IP Instr TCPIP SOCKET TCPIP[board]::host address::port::SOCKET TCP/IP Socket
[board] is the number of the interface (0,1,2,3,...) that you can specify and therefore force LabVIEW to use. For example, if your wireless card is adapter 2, you would use the VISA resource:

TCPIP2:192.168.1.100

I am not 100% sure whether [board] is the exact same thing as the output of Windows "Route print" function but I'll let you test it! Let us konw what you find out.

Olivier

In addition to the other good pointers you've received, here's one more piece of advice, since you said you're running on a PC (I'm assuming you're running under a Windows OS):

Open 'Network Connections', either through the Control Panel or by right-clicking on an adapter icon in the SysTray. On the menu, select 'Advanced->Advanced Settings...'. From here, Windows allows you to reorder adapter priority. This comes in to play when multiple adapters can each reach the same destination address.

I've seen too many laptops with built-in WiFi that used the wireless adapter for all network traffic, even when docked to a 100base-T line It's a quick fix, and I always get "Wow! my [mail/websurfing/fileserver copy/etc] is SO MUCH faster now!"
Dave