about to add an additional router, wire or wireless

Hi all,


Internet Connection:-
DSL 4MB/4MB (up and down)
Static IP
(for home use)
--------------

Wiring connection:
PC -> Router -> Modem -> ISP

Modem and router are supplied by ISP.

Modem:
Comtrend
Model SR-2010 (4 wire)

Router - wire

The modem is provided with 4 sockets, only one being used and connected to the router.

I'm prepared to set up an addional network with a wireless router. Would it be possible to connect it to an used socket of the modem. In this connection both routers will be connected to the same modem?

I have tested the sockets of the modem. All work with the wire modem without problem.

Please advise. TIA

B.R.
satimis

No, I can't believe that would work.
Your ISP gives you one IP, the modem connects and acts as a bridge, and router's WAN has the ip your ISP delivers.
This I'm pretty sure of, because if the modem actually holds the public IP and has 4 switchports then there would be no need for the router.

Originally Posted by pingu No, I can't believe that would work. Your ISP gives you one IP, the modem connects and acts as a bridge, and router's WAN has the ip your ISP delivers. This I'm pretty sure of, because if the modem actually holds the public IP and has 4 switchports then there would be no need for the router.

Hi,

Just made following test.

- removed the cable for connecting the PC to router
- plugin the cable direct to the modem

Connection was broken. That means I must connect the system as;
PC -> Router -> Modem -> ISP

I have been using this ISP for more than 4 years. IIRC before I have asked them whether I can connect PC to modem direct without passing through the route. They told me it is possible with the password provided by them. At the that time I subscribed ADSL plan, 8M down and 250K up, with static IP as well. I suppose I have the said password stored some where.

B.R.
satimis

Well, if you can login to the router then maybe you can get the password. Not very likely, but it happens sometimes.
Best bet is to ask your ISP, hopefully they'll allow you to replace their router.
You need to get some config info as well and change your wl-router accordingly.
That info can definitely be read logged in on router - but again, easiest is to ask your ISP.

Originally Posted by pingu Well, if you can login to the router then maybe you can get the password. Not very likely, but it happens sometimes. Best bet is to ask your ISP, hopefully they'll allow you to replace their router. You need to get some config info as well and change your wl-router accordingly. That info can definitely be read logged in on router - but again, easiest is to ask your ISP.

Hi,

Thanks for your advice.

My aim is not connecting the 2nd network to ISP. Just for interest whether it is possible to connect the 2nd network to the socket of the modem.

I'm testing Cloud here, OpenStack and Opennebula. They need 2 networks, one for external and another for internal. For such reason I need an additional router for 2nd network.

Ah, but then connect your wl-router ("WLR") to the router ("ISPR") - it surely has switchports available?
If not just buy a small switch, they cost almost nothing today.
Give your WLR a static ip, make sure it's outside the dhcp range ISPR uses.
Then for LAN on WLR choose a network adress different from the one your pc is on.

... okay maybe I missed out of one thing:
You need to reach your servers on a public ip?
That's trickier, but can be done.

Since you can't just add another router to the modem, you'll have to do port-forwarding. If you can't access ISPR then you're lost. You'll have to get config & password to replace their router with your own - but now you'll need a router with interfaces for 3 different networks!

Hi pingu,

Lot of thanks for your advice.

Actually I need a 2nd loop for testing Cloud according to the guide which I'm following. I haven't got to that step yet just making preparation in advance. I think a switch may also do the job for internal looping?

Originally Posted by pingu ... okay maybe I missed out of one thing: You need to reach your servers on a public ip? That's trickier, but can be done. Since you can't just add another router to the modem, you'll have to do port-forwarding. If you can't access ISPR then you're lost. You'll have to get config & password to replace their router with your own - but now you'll need a router with interfaces for 3 different networks!

Interesting !!! The second router can connect Internet via the same modem? Using the same static IP?

Advice and pointer would be much appreciated. TIA

B.R.
satimis