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Veki

Posts: 381
Location: Croatia

Posted: Wed, 17th Feb 2010 17:48 Post subject: Blocked internet access - DHCP server	Quick Quote Quote

I have a PC on a network with DHCP server and internet access is blocked. I know that by changing my MAC address I can avoid the block and have been doing so. But now DHCP server is not using my MAC address to identify my PC and is using something else. Anyone knows how can a PC be identified other that MAC address? I read a bit about DHCP and there is something called Client ID. It's a unique PC identifier and most of the time it is PCs MAC address, but it can be something else. Could that be my case? If so, what can Client ID be, how can I find out and change it to avoid the block? Beware of he who would deny you access to information, for in his heart he dreams himself your master. Commisssioner Pravin Lal "U.N. Declaration of Rights"

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shole

Posts: 3363

Posted: Wed, 17th Feb 2010 19:21 Post subject:	Quick Quote Quote

as far as i know, the client first requests the old ip from the dhcp server and takes it if it's available before asking for a new one beyond that i don't know only thing sent should be the mac ofcourse they can trace the traffic's route and block it manually from the router

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LeoNatan
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Posted: Wed, 17th Feb 2010 19:37 Post subject:	Quick Quote Quote

Try chancing the computer network identifier from computer properties. My IMDb Ratings \| Fix NFOHump Cookies \| Hide Users / Threads \| Embedded Content (Videos/GIFs/Twitter/Reddit) \| The Derps Collection Death smiles at us all; all we can do is smile back.

Veki

Posts: 381
Location: Croatia

Posted: Wed, 17th Feb 2010 20:00 Post subject:

shole wrote:

as far as i know, the client first requests the old ip from the dhcp server and takes it if it's available before asking for a new one
beyond that i don't know
only thing sent should be the mac

Can I clear the old IP manually so I may get a new IP?

shole wrote:

ofcourse they can trace the traffic's route and block it manually from the router

How? And how can I avoid that?

iNatan wrote:

Try chancing the computer network identifier from computer properties.

I did, I get the same IP now. Before, I always got a different IP.

This is what I found about Client ID :

http://www.dhcp-handbook.com/dhcp_faq.html#wiaci

Quote:

What is a Client ID?
What is termed the Client ID for the purposes of the DHCP protocol is whatever is used by the protocol to identify the client computer. By default, DHCP implementations typically employ the client's MAC address for this purpose, but the DHCP protocol allows other options. Some DHCP implementations have a setup option to specify the client ID you want. One alternative to the MAC address is simply a character string of your choice. In any case, in order for DHCP to function, you must be certain that no other client is using the client ID you choose, and you must be sure the DHCP server will accept it.

Anyone knows how can I see my PCs Client ID and change it?

Beware of he who would deny you access to information, for in his heart he dreams himself your master.
Commisssioner Pravin Lal
"U.N. Declaration of Rights"

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shole

Posts: 3363

Posted: Thu, 18th Feb 2010 02:29 Post subject:	Quick Quote Quote

the non-mac client id's i would think would be exclusively for special case networks that want to keep it extra locked down there's these switches for ipconfig, but i don't know if they do what you want /registerdns Refreshes all DHCP leases and re-registers DNS names /showclassid Displays all the dhcp class IDs allowed for adapter. /setclassid Modifies the dhcp class id. i don't know what kind of a network you're on, but if they have access to routers in the network between you and the internet, and they block you from the router, there's not many things you can do with that, other than physically going to the router and switching your cable to an open port and hope it's enabled i'm not any expert on any of this though are you stealing your neighbor's corporate cable or something?

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