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IP Address Look up on Ethernet

 
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IP Address Look up on Ethernet, look up unknown ip addess of connected device
GSReddy
post 1 Aug, 2008 - 11:20 AM
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Hi

I would need to look up the IP address on other end connected hardware through ethernet. I mean, connect laptop to one end of ethernet and other end to hardware. But, I do not know the hardware IP Address, Subnet mask, and Gateway.

I'm wondring, is there any way that I can write peace of code in c# to pull those address from connected hardware.

I greatly appreciate your help.

Thank you,
Reddy
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skaoth
post 1 Aug, 2008 - 01:09 PM
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Are you using a crossover cable to connect these devices together (laptop to hardware)?
If you are then the info you need is here: http://en.wikipedia.org/wiki/Ethernet_crossover_cable
at the bottom of the page section "Networks created using crossover cable"

If your not, then you may never know. because what means that the two devices will have to use a router to communicate with each other. When using routers, it is pretty much unknown what the internal addressing scheme is. This is assuming that the two devices are on separate networks

This post has been edited by skaoth: 1 Aug, 2008 - 01:11 PM
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DeCompile
post 1 Aug, 2008 - 04:07 PM
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The great thing about today's hardware in respect to the previous era's hardware is that network adaptors of today will actually auto - negotiate their network.

This means that if they detect that they are connected to another computer directly, they will swap their internals and act as if they have a cross over cable connected.

In regards to your question, if the other computer has a static IP address and you are connecting directly to it you can do it this way:

It can be done, unfortunately it takes a very very long time to find it. As you have to set the network address of every available network subnet. So that's over 65 million different combinations. There are shortcuts, but even still. It will be quicker to just read it off the other computer.

Otherwise you would have to:

Change IP address of the local network adapter, and subnet.
Ping all addresses available in that subnet and then change to the next one.
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skaoth
post 1 Aug, 2008 - 08:17 PM
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QUOTE
The great thing about today's hardware in respect to the previous era's hardware is that network adaptors of today will actually auto - negotiate their network.


Am I starting to show my age here!!
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DeCompile
post 1 Aug, 2008 - 08:32 PM
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It certainly could be. biggrin.gif

Although, I will admit you do see 'legacy' devices in the field sometimes.
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