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Old 04-01-2016, 02:43 AM   #1
iFunction
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Internet access blocked on Raspberry Pi


Hi there,

This is just a general question about how this is done. At work on the visitor network, I suspect some new rules have been set up, as I can no longer get onto the internet with a raspberry pi, yet all other connections to this network work, so I can get on using my phone and other computers, but no Linux computers can get on.

Is this something that is possible to do as a side effect of setting up some configuration rules on the network? Or, is it my configuration of my Raspberry Pi. I have 36 of these and have not had a problem till 2 days ago.

Any advice on this would be appreciated and just to confirm, I have no intention of violating Works computer policies, but it would be good to know what is going on.

Kind regards
iFunk
 
Old 04-01-2016, 03:14 AM   #2
ferrari
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Can you not ask the administrators about access requirements? Maybe they have implemented access control (MAC address filtering). If so, that can be reasonably easily circumvented as explained here

http://www.howtogeek.com/204458/why-...-wi-fi-router/
 
Old 04-01-2016, 03:32 AM   #3
iFunction
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I work for a growing company of 2000 employees and we have many visitors due to the historic nature of the business, so i suspect mac filtering is not being used otherwise visitors would not be able to get on the network.

Unfortunately the IT department will not support our departments project (don't ask - this is a nightmare for me) and so any requests to even flush the cache on the visitors network will not happen.

What I am trying to determine is why none of my raspberry Pi's not connect to the internet when they did 3 days ago, so I was suspecting they have put some sort of block on Linux OS as a security thing maybe?
 
Old 04-01-2016, 03:36 AM   #4
ferrari
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Another thought that I had - Is it possible that they have implemented captive portal? That would then require a device user to accept terms and conditions shown on an interstitial web page before being able to gain internet access. Existing devices may already be on some kind of whitelist perhaps.
 
Old 04-01-2016, 03:42 AM   #5
iFunction
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Yes yes, they implemented that this week apparently. Will that prevent internet access for a linux machine then? Is there a way to get to the terms and conditions, as I can't get to that even?
 
Old 04-01-2016, 03:42 AM   #6
ferrari
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Quote:
Unfortunately the IT department will not support our departments project (don't ask - this is a nightmare for me) and so any requests to even flush the cache on the visitors network will not happen.
Well, I guess to could try MAC spoofing (using the donor MAC address of a device that can connect successfully). Not hard to do with Linux devices.

Another approach would be to use internet connection sharing on a device that can connect, creating a hotspot for the Raspberry Pi devices to connect to.

Quote:
What I am trying to determine is why none of my raspberry Pi's not connect to the internet when they did 3 days ago, so I was suspecting they have put some sort of block on Linux OS as a security thing maybe?
I know there is software like netcut (ARP spoofing/poisoning) that can be used for this type of blocking.
 
Old 04-01-2016, 03:44 AM   #7
iFunction
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The problem is that apt-get no longer works, so development of the system here has somewhat ground to a halt.
 
Old 04-01-2016, 03:58 AM   #8
ferrari
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Quote:
Yes yes, they implemented that this week apparently. Will that prevent internet access for a linux machine then? Is there a way to get to the terms and conditions, as I can't get to that even?
Captive Portal? One way to go might be to consider internet connection sharing with a laptop with additional wireless NIC, or invest in a travel router that can do the same. For the latter, a laptop connected to this can be used to complete the initial login page.
 
Old 04-01-2016, 04:01 AM   #9
ferrari
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BTW, captive portal normally won't prevent access to a Linux machine, but you will need to fire up a browser manually, and try navigating to a web page. This should bring up the login page to get authenticated.

See here
https://askleo.com/why-cant-i-connec...eless-network/
 
  


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