Removing of known devices from a Cisco router

[glubsch1984]

Dear all

I am in the situation that my neighbor accuses me of having used his internet connection by connecting to his Cisco router from my home via Wifi.

The router is a Cisco EPC3828D, i think this is an older one and I cannot find any documentation.

When analysing the routers user interface, the only devices listed as known by the router are devices owned by my neighbor and his family, but no device of mine.

As far as I know from other router brands, the only ways to remove a known device from the router list, is to do it from a device but not the one with which you log into the router as it is not possible to remove a device actually connected. And the other way would be a factory reset either using the user interface or a reset option an the devices hardware, but this would also erase the saved internet credentials to connect to your provider, so it should be reconfigured to connect to the internet (provider).

Could someone please confirm for the router EPC3828D that:

- It is not possible to delete your own device in use from the known devices list and that to remove a device from this list one has to use another device which would then still be listed.

- A factory reset would also remove the saved internet provider information / credentials and would be noticed by the owner.

Thank you very much for your help.

[marce1000]

                    >....It is not possible to delete your own device in use from the known devices list 

 And it would be a waste of time too. Tell your neighbor to use a strong wifi password with WPA2 (e.g.) , from your side you could

do the same (e.g2.) 

 M.

[glubsch1984]

The point is that even with no device of mine showing up in his router, they still pretend that I used his Wifi.

I feel that I have to prove that this cannot be possible.

Concerning the WPA2, as it seems he used the WPA2 standart, but only with the default password that was predefined by Cisco and this was only 8 digits, nothing more.

And they pretend because it was WPA2 that nonody could easily find that out...

[marce1000]

                       > I feel that I have to prove that this cannot be possible.

  I don't see it that way, if he chooses a strong wifi password , reboots his router , then he is safe from unwanted connections and previous ones have been cleared because of the reboot.

 M.

[glubsch1984]

All you write is absolutely correct for future actions.

But the case is that about 2 years ago, his IP appeared in accounts where it should not and they want to pretend it was me and not himself.

Considering that none of the listed devices is one of mine, I need the confirmation that I would not have been able to remove a device of mine without the device I would have used to do that removal still showing up.

And that if with a factory reset all devices would have been removed, so would also have his internet connection credentials been removed and he would have noticed that because it would have needed to be newly configured.

I hope it is somehow clear what I mean to say.

Furthermore the statement that his 8 digit WPA2 password would have been that safe, is not correct in my opinion and it could have been attacked.

[marce1000]

 >...But the case is that about 2 years ago, his IP appeared in accounts where it should not and they want to pretend it was me and not himself.

   Delirious , a thief-in-da-house  or unauthorized use by a home/family member could have done the same thing.

  >Furthermore the statement that his 8 digit WPA2 password would have been that safe, is not correct in my opinion and it could have been attacked.

                    Anything  can be attacked but not necessarily cracked

 M.

[glubsch1984]

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@marce1000 wrote:

 >...But the case is that about 2 years ago, his IP appeared in accounts where it should not and they want to pretend it was me and not himself.

   Delirious , a thief-in-da-house  or unauthorized use by a home/family member could have done the same thing.

---

Yes really delirious, but I am in a mess now because of this, but it is obvious that it could not have been me...

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@marce1000 wrote:

  >Furthermore the statement that his 8 digit WPA2 password would have been that safe, is not correct in my opinion and it could have been attacked.

                    Anything  can be attacked but not necessarily cracked

 M.

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Ok, but means attacked that someone could get into the Wifi without knowing the password by whatever means?

[Georg Pauwen]

Hello,

which router model do YOU have ?

[glubsch1984]

The router concerned is a Cisco EPC3828D (the one my neighbour used and on which he accuses me to have had access, but no device of mine is showing up).

I personally use a FritzBox 7590, and there I know that the only possibilities to remove a known device are as I described in my initial post. But I do not know if it is the same with the Cisco router, but I suppose it should be.

[Georg Pauwen]

Hello,

as suggested by @marce1000 , have a look at the link below and (try to) explain to your neighbor that once he enters an SSID and a password (which you don't know) there is no way you can get access to his network.

I just checked which networks are visible from my laptop, the count is 29. I cannot connect to any of them since they are secured.

https://setuprouter.com/router/cisco/epc3828d/login.htm

[glubsch1984]

Ok so far, but the problem is that I once knew his password.

That is why it is important to explain that if no device of mine shows up, than I did not use it.

And I think there are people out there that can hack into a Wifi protected with a WPA2 passcode of 8 digits and even if a better password would have been used.

Is it normal that the user manual in the link is in a strange language I do not know?

[Georg Pauwen]

What language is the link in ? I only see English...

[glubsch1984]

The user manual:

https://setuprouter.com/router/cisco/epc3828d/2062.pdf

[paul driver]

Hello

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@glubsch1984 wrote:
When analysing the routers user interface, the only devices listed as known by the router are devices owned by my neighbor and his family, but no device of mine.

The point is that even with no device of mine showing up in his router, they still pretend that I used his Wifi.

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Do you mean if the wifi listing of the router, if so all that this means is the neighbors wifi router is broadcasting its wifi network, now if they have not applied ay authentication/encryption to their wifi network then anyone not just you would be able to connect if they are within range, so the onus is on them to secure their own network not you?

AS for your own WIFI network, I would also suggest you do the same, disable SSIDs from broadcasting and apply authentication/encryption to them.

[glubsch1984]

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@paul driver wrote:

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Do you mean if the wifi listing of the router, if so all that this means is the neighbors wifi router is broadcasting its wifi network, now if they have not applied ay authentication/encryption to their wifi network then anyone not just you would be able to connect if they are within range, so the onus is on them to secure their own network not you?

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It was protected by a WPA2 password of 8 digits.

I mean the list of known wireless devices.

The list shows the wireless devices which are currently connected with the router or known from previous connections.

And there is no device of mine listed in his router. Only devices of him, his wife, and his parents.

The problem is that I once knew his password.

That is why it is important to explain that if no device of mine shows up, then I did not use it.