My roommate and I bought the same laptop last week. The Dell Inspiron 15 7000 series i7559. When we try to hook both of th

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jsmithepa


While you are in there, please check both MAC addresses. If they are the same then you need to return one of them.
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JackNaylorPE

JackNaylorPE

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1. Make sure that the two laptops have different names ... i.e.

Joe' Laptop
Bill's Lappie

2. If possible, (check w/ network administrator) set static IP addresses for both laptops. See post #8 here

http://www.sevenforums.com/network-sharing/311437-how-set-up-static-dns-ip-address.html

Open up a command prompt
http://www.sevenforums.com/tutorials/947-command-prompt.html

Type "ipconfig" without the quotes and hit return

The IPv4 Address is what you are likely being assigned by the dorm's router, say

192.168.1.14

That 14 is you... that DHCP range will typically be between say

192.168.0.2 and 192.168.0.254

or

192.168.1.2 and 192.168.1.254

Network administrators have different preferences on what happens on the networks they administer... some like assigned addresses, other prefer that the router assign as needed.

Problem arises when two folk's puters wanna use the same IP address. On my networks, I assign IP addresses for desktops and let router assign for laptops. So, again, ask your network admin how he wants you to solve the problem.
 
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Fitz4492

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You know what I don't think either of us have named our laptops yet. So I will try that first. And we did open the command promp and type in "ipconfig" and I'm pretty certain we had the same IPv4 address. I'll double check once I get back from class in a few hours and let you all know. Thank you both so much.
 
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JackNaylorPE

JackNaylorPE

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That is not very plausible as MAC addresses are supposed to be unique. The only way I can envision that happening would be

a) spoofing
b) a mistake during manufacturing
c) willful negligence on the part of the manufacturer.

http://www.dummies.com/how-to/content/cisco-networking-mac-addressing.html

The MAC address is a 12-digit hexadecimal number or 48 bits in length. This address is assigned by the hardware manufacturer and is globally unique, so you should not have duplicate addresses on your network
Click to expand...
 
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Fitz4492

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So we took a second look and had the same IPv4 address. I watched some YouTube video and manually input a new IPv4 address in. Now we both seem to have internet but when we try to play a game of counter strike go in steam only one of us gets into a match. Any ideas?

 
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JackNaylorPE

JackNaylorPE

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You chances of winning a $250 million dollar lottery after surviving a lightning strike are greater. :). MAC addresses, by definition, must be "globally unique".

It is possible, manufacturers aren't perfect.... but given the maturity of the Dell Inspiron line, if there was an issue, it would have been caught and recalled by now.

But as you said, no harm in checking if your both sitting in the same room.
 
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jsmithepa

jsmithepa

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Before you spend the time returning it to Dell, this MAC maybe user-changeable. Go into the NIC's property and see. If that doesn't work, shoot an email to Dell tech support, they may know a way to do this yourself. Just change one of the digit to something else.
 
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JackNaylorPE

JackNaylorPE

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I'd play the lottery ... TODAY !

If they are the same, I would consider returning BOTH laptops. That is indicative of those units perhaps being used for testing and then sold to you as new. I would not spoof it and creating a new MAC address is likely to be someone else's.

From above link

Typically, the problem of duplicate MAC addresses arises because people choose not to use the vendor-assigned hardware address, but instead use a self-assigned address (also called a locally administered address). This is a technique used by hackers to circumvent MAC-based security restrictions.

This is more common when using main frame systems that communicate via MAC addresses rather than protocol addresses (such as IP addresses).

In the later case, if a computer or its network card is replaced due to a hardware failure, you would have to reconfigure several systems to work with the new MAC address, so it is far easier to assign the new network card the same MAC address as the failed card. Unless you are in the small minority of people with a system such as this, or are a big time hacker, you can safely ignore the ability to manage your own MAC address.
Click to expand...

 
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