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Reply to Message Icon Go to Main Page Icon

Modem and Router

Original Message
Name: networkid83
Date: September 1, 2007 at 05:30:46 Pacific
Subject: Modem and Router
OS: XP
CPU/Ram: Celeron
Model/Manufacturer: Custom
Comment:
Hello,

Out of curiosity I want answer to simple question.

I have a Dlink 4 port modem connecting to ISP.

Also have wireless Netgear 4 port router which connects to my modem using ethernet cable.

I can use access internet when i connect my desktop PC to netgear router without problems.

But why cant i access internet when i connect my desktop pc to a ethernet port on to a modem?

I am not very computer literate!

Is it because router takes over the responsibility to assign ip address when router is in place??

Networkid


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Response Number 1
Name: paulsep
Date: September 1, 2007 at 06:29:09 Pacific
Subject: Modem and Router
Reply: (edit)
Because you have to authenticate to your ISP.
I guess, normally the Router does the authentication for you and every pc connected to that router, has access to the internet.
If you directly connect your pc to your modem, the authentication has to be done from you pc.
When this is done, you can access the internet.

Paul


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Response Number 2
Name: StuartS
Date: September 1, 2007 at 07:02:36 Pacific
Subject: Modem and Router
Reply: (edit)
There is no such thing as four port modem. A modem either plugs into a router which in turn has a built in four port switch or you have a router/modem combination which may also have a built in switch. If it has four ports there is something more than just a modem there.

What you have here is two routers in the same network. This is usually unnecessary but it can be made to work. You will need to disable DHCP on one of the routers. It is the DHCP which allocates private addresses to each computer in the network.

Some model numbers would help so that the guess work can be taken out of it.

Incidentaly, it is the modem that does the authentication. Not the router. The router does the network address translation from the public IP address provided by the modem.

Stuart


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Response Number 3
Name: networkid83
Date: September 1, 2007 at 07:07:12 Pacific
Subject: Modem and Router
Reply: (edit)
Thanks for the help!!

Makes sense

Networkid


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Response Number 4
Name: networkid83
Date: September 1, 2007 at 07:11:54 Pacific
Subject: Modem and Router
Reply: (edit)
StuartS,

I have Dlink wired router and netgear wireless router. My mistake!

So, what you is saying is to disable DHCP in the wired Dlink router??

Right?

Networkid


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Response Number 5
Name: StuartS
Date: September 1, 2007 at 09:23:53 Pacific
Subject: Modem and Router
Reply: (edit)
If you want to plug anything into the Dlink is is probably best to Enable DHCP in that and disable DHCP in the wireless router as well as Network Address Translation. Let the Dlink do all the work as is is the first router in the chain.

You are then just using the wireless router as a wireless access point and Ethernet switch.

Stuart


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Response Number 6
Name: Walter Mitty
Date: September 1, 2007 at 10:33:17 Pacific
Subject: Modem and Router
Reply: (edit)
Why not have DHCP in both ??

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Response Number 7
Name: StuartS
Date: September 1, 2007 at 13:06:27 Pacific
Subject: Modem and Router
Reply: (edit)
Because you cant have two routers on the same network both issuing IP addresses. They will both get confused and Network Address Translation wont work properly.

You can have two DHCP servers on a client/server network but that is a different thing altogether. The two DHCP servers communicate with each other so there is no confusion. There is no facility with SOHO router for them to communicate with each other.

Stuart


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Response Number 8
Name: networkid83
Date: September 1, 2007 at 20:02:32 Pacific
Subject: Modem and Router
Reply: (edit)
Good point StuartS!!

Thanks

Networkid

"Try more achieve more"


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