Connect only the wireless router to ADSL modem with ethernet cable and bar the direct PC connections to the modem

gini_d

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May 8, 2014
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I have a ITI ADSL Modem with single ethernet port and an iball 150N Wireless Router. The connection with the ISP is through the PPPoe mode in the modem and the router has been connected via an ethernet cable to the modem.
The problem I am having is that I want only router to be able to connect with modem, other users if they try to take the ethernet cable from the modem and plugin into their laptops or PCs they should not be able to do so?
How can I establish this?

Approaches I have tried :
1. Putting the modem in bridge mode and use the router in pppoe mode - didn't work because bridge mode in modem doesn't work
2. Mac filter only the router through modem. This stopped traffic from all other station.

Please help me do this.
 
Solution
MAC address is like an identification card for a network.

if you block their MAC address on the modem, and not on the router... then the effects will be a conflict of communication by the router and modem, because the router will be pulling data "upload/download" from the modem.

since the MAC address is static, meaning it doesn't change, the router will allow that particular MAC address to connect to the network, but the modem will prevent that MAC address from receiving or sending data.


The thing is I have a shared internet connection, I connect to internet through WLAN but the other user pulls out the cable from the modem and connects that to his PC. So, I am left connected only to the router but no internet access. For Clarity, the modem is only basic adsl modem.

 


Sorry for the confusion, There are two devices a modem and router, the ISP ADSL line connects to the Modem through ADSL Splitter directly and the ethernet cable from modem connects to the iball wireless router.
 

I am sitting right in front of it. The setup is quite similar to this picture
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just to be clear....

1. your computer is physically connected to the router via WIRED (RJ45) Ethernet cable. is this correct?

2. other people are connected to the router via WIRED Ethernet cable or WIRELESS signal?

3. you want to limit or disable Internet connection to those people?
 


Answer to your questions:
1. I connect through Wireless Signal only router is connected to modem through ethernet cable.
2. Other people connect through wireless signal too but there lies the problem as explained below.
4. I want to avoid others to physically disconnect the ethernet cable from router.

Rephrasing:

In usual situation:
All stations are connected to wireless router through Wireless Signal and access internet.

In Problematic situation:
A mischievous user pulls out the ethernet cable from router and connects that to his PC and is able to connect to internet while other users are still connected to router and therefore are not able to access internet.
I want to avoid this user from accessing internet directly from modem but he should be able to connect through router.
 
short answer, no.

your problems is that if someone removes the ethernet cable from the router, so that the culprit can connect directly to the modem and ("pardon the use of words") Hog/monopolize the internet connection, resulting in loss of the said internet connection when you re-attach the ethernet cable to the router.

this happens because your router like a computer has an IP address and a gateway address provided by your ISP thru the modem, so if someone connects the modem's ethernet cable to their computer, the modem will assign a different IP address, thus if you reconnect it back to the router, no internet connection.

but it should restore to normal if you turn off the router for 30 seconds then on again.
 


Thanks for the elaborate answer, there is one solution that comes to my mind:
- Block the mac address of the said user on the modem and allow it on the router.
- The question is will he be able to access internet through router or the modem will block the incoming or outgoing packets

 
MAC address is like an identification card for a network.

if you block their MAC address on the modem, and not on the router... then the effects will be a conflict of communication by the router and modem, because the router will be pulling data "upload/download" from the modem.

since the MAC address is static, meaning it doesn't change, the router will allow that particular MAC address to connect to the network, but the modem will prevent that MAC address from receiving or sending data.
 
Solution


So, I am stuck with the option of buying MODEM-cum-ROUTER, still many thanks for answering my question.