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Dsl modem and wireless router on different networks

Last response: in Wireless Networking
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May 12, 2012 5:08:59 PM

Hello,
my dlink dsl-520b dls modem is using 192.168.1.1 and is plugged into the WAN port on my dlink wireless router.
the wireless router is 192.168.0.1. (these are both in the main building which is remote from my shop).
Then i have a netgear wireless access point This spreads the signal properly, and I can get connectivity on all my computers -although i do have to specify a default route on the computers on my shop side of the access point.

question is - I noticed that the internet light on my modem is red which indicates no internet connection. I am still able to access the internet fine, but i would like to be able to log into the modem from my network. I was able to do this before by setting a computer with a netmask of 255.255.0.0. Would that be the proper method or is there something I am missing? I have lots of networking experience but never really used multiple private ip ranges.
I should also mention that this is a linux network - no windows machines at all.
May 12, 2012 5:40:23 PM

You have two routers -- I would recommend that you either (1) turn off the DHCP service in the dsl-520b, and leave the wireless router DHCP on and change the netmask to 255.255.255.0 and direct all your computers to obtain IP from the 192.168.0.1 gateway, OR (2) leave the dsl-520b DHCP on and assign the wireless a reserved dynamic or static address in the network range but outside the DHCP assignable range, like 192.168.1.230 and stop DHCP assignments at .229 -- then turn off the DHCP in the wireless to use it as an AP with a netmask of 255.255.255.0 and direct all computers to the gateway 192.168.1.1. In the second case your other AP would be something like 192.168.1.231 or a dynamic reserved address.

Your choice, and assuming that you don't really need two networks for some reason.

I assume that your current additional AP is using different radio channels from the wireless modem, that they use the same SSID and passkey so that your computers will seamlessly connect to the stronger AP.
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May 12, 2012 9:19:16 PM

Thanks for the speedy response.

I am using method (1) -
DHCP off in DSL-520b with ethernet cable going to wan port on the wireless router.
DHCP on in the router
DHCP off in the AP. The AP has a static ip of 192.168.0.100, and uses the same SSID, and i believe
its on the same channel as well.

as to needing two networks......i could use/do that, but hardly from necessity - more the twisted nature

on local network the only DHCP machine is the wireless i used to config from the shop.
all the rest are static. The DHCP does not seem to work very well behind the AP. The assigned
netmask is 255.255.255.0.

this makes the dsl modem nonaccessable from the internal network. The internet is working
properly so the signal is making it through.

I guess the bottom line here is this: I would like to be able to access the modem at 192.168.1.1
from my browser so I can config some things, and I dont want to have to put a cable to it everytime
i need access. That is where the 255.255.0.0 netmask came into play. i think im making it too
complicated because of my twisted nature. or staring directly at the problem and not seeing it.
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May 19, 2012 2:36:48 PM

Yes, you are over-complicating it. After some thought, I would recommend that you change your network configuration to the second that I discussed.

Leave the dsl-520b (gateway 192.168.1.1) DHCP on and assign the wireless a reserved dynamic or static address in the network range but outside the DHCP assignable range, like 192.168.1.230 and stop DHCP assignments at .229 -- then turn off the DHCP in the wireless to use it as an AP with a netmask of 255.255.255.0 and direct all computers to the gateway 192.168.1.1. In the second case your other AP would be something like 192.168.1.231 or a dynamic reserved address.

Physically connect the AP to the router with a CAT5e cable going LAN to LAN (not WAN).

Use *different* radio channels for the wireless modem and AP to avoid interference between them, and use the same SSID and passkey.

Using a netmask of 255.255.0.0 gave you a much larger network that could accommodate some 65,000 devices, so that allowed a connection between the two subnets by putting them in the same network, but at the cost of a slower network as broadcasts go to all the possible connected devices. Use 255.255.255.0 -- that allows a gateway of 192.168.1.1, broadcast of 162.168.1.255, and you can use the addresses from .2 to .254 however you wish, but the equipment you have will work better.
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May 21, 2012 5:52:15 PM

my setup is somewhat what you have said - the major difference is that the access point is setup remotely from the router - across about 35' of paved parking lot. its all working fairly well right now.

the reason i would need to use 255.255.0.0 for the ONE computer would be to access the modem thru its web interface:

dsl modem: 192.168.1.1
wireless router: 192.168.0.1
webserver: 192.168.0.20
AP: 192.168.0.200

routers DHCP range is 192.168.0.50-60

at this point when you goto the web address for the webserver you get the modem signin page, but it wont allow me into it that way. its all just laziness to avoid the walk across the parking lot with a ladder and laptop :D 

thanks for the replys
Don
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May 21, 2012 6:08:43 PM

Ah, okay. It's funny but with most networking questions here there are some unstated things going on, like a parking lot in the mix. :) 
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May 21, 2012 9:35:46 PM

the parking lot isnt really significant in this situation i guess - i just want to be able to access the modem from the shop. That was a good piece of info on the size of the subnet - i wasnt aware that info was sent out to every possible address. lol guess thats why its called a hobby!
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!