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Nov 20th, 2007
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1 plugged in Ok, 2 plugged in 1 disconnects

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Windows XP Sp2
Netgear dual speed DS106 hub 10/100
Norton Anti-virus 2005
Mac Make up - Mac ip spoofer
PeerGaurdian

Ive been sharing a cable connection with my roomate for the last 5 months no problem.
We were able to both get on simultaneously after he installed mac make up on his system and spoofed my mac address. Everything has been fine until yesterday.
It seems that anytime he is plugged into the hub I automatically disconnect from the network.
If I disconnect him, I instantly get back on the network.
Ive tried unplugging the hub for while to reset it, I tried different ports on the hub, Both of us have done a restore point in XP to several days ago before it happen (no help), He still has mac makeup installed on his system and it still has my mac address in there. I reinstalled my network components in windows, no help.
It seems like something really easy with the symptoms but my network ability is limited.
If someone can point me out in the right direction it would be greatly appreciated.
Let me know if you need more info,
Thanks in advance,
-Dogmatic
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Nov 20th, 2007
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

Assuming you have no router, it may be that the other end, the ISP, has set some policies to prevent what you're doing.

I would have thought that if you come out of the cable modem into the switch and then distribute to two PCs, you wouldn't need to do any MAC address spoofing.

Can you tell us more?
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

Click to Expand / Collapse  Quote originally posted by Suspishio ...
Assuming you have no router, it may be that the other end, the ISP, has set some policies to prevent what you're doing.

I would have thought that if you come out of the cable modem into the switch and then distribute to two PCs, you wouldn't need to do any MAC address spoofing.

Can you tell us more?

Hm, well I went to go look to the path of where we get our data. It looks like its fiber all the way to a box outside the house, it then turns into Cat5 all the way to the garage to a UPS unit, which then the cat5 line goes directly into the computer room. So its not cable, sorry.
I hope that helps in determining this issue,
Thanks Suspishio for the fast reply.
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

I can see why you'd want to spoof a MAC address - it's likely to be because of policies set by the network administrators to prevent more than one MAC address being used per LAN connexion.

But there are other detection techniques they can use, particularly IP addressing. And a swiytch can be detected. So suspect network admin policies being enforced.

At least from this distance, this is what I suspect.
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

When we first got the connection, we had the same issue when more then 1 person tried to access it.
Only until the 2nd system spoofed the mac address were we both able to access the connection.

a small update: I had some torrents downloading and my roommate wanted to use the net. So I just plugged him in, it did what I thought it would do and all my downloads stopped. I left the system for 30 mins and came back to see that 2 of the 3 downloads were still going, but not that fast (30k Sec). I checked HTTP, but that was still unsuccessful.
If I unplug him, the downloads go "full speed".

Is there another way around the particular network admin policies that stop both of us accessing the full connection at the same time?

Thanks for all your help Suspishio.
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

The slow down was prolly due to bandwidth consumed by the other device trying to get on. Not sure - would need to see it to know for sure. But that doesn't really matter.

There is no way round policies set at the service provision end if they are determined to defeat route sharing.

I suggest that you contact the network administrators and persuade them that it is unreasonably restrictive to your joint studies (have I got that right?) when a room is being shared to prevent one of the people from accessing the network. They can reset policies at patch panel level.
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

why not just buy a proper router, plug both pcs in with their own macs, and make the router simulate the mac on the outgoing connection to the ISP?
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

Click to Expand / Collapse  Quote originally posted by DimaYasny ...
why not just buy a proper router, plug both pcs in with their own macs, and make the router simulate the mac on the outgoing connection to the ISP?
Because, based on what dogmatic has said, the network administrator has restricted the LAN segment to a single user.

When that's sorted out, the switch will do fine.
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

that is exactly why soho routers have mac emulation built in.
I've done this with quite a few different ISPs all over the world, and it worked everywhere inspite of the ISP's restrictions, because the router simply acts as a single PC plugged into the network, and the machines behind it go surf a NAT gateway.
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Re: 1 plugged in Ok, 2 plugged in 1 disconnects

Click to Expand / Collapse  Quote originally posted by DimaYasny ...
that is exactly why soho routers have mac emulation built in.
I've done this with quite a few different ISPs all over the world, and it worked everywhere inspite of the ISP's restrictions, because the router simply acts as a single PC plugged into the network, and the machines behind it go surf a NAT gateway.
Yes indeed. NAT - a good point.
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