New modem router from the cable provider

[pcrene]

Hello All and Cheeseboy,

My old modem gave my linsysrouter an extenral ip. The new router i got last week is a complete router with 4 internal RJ45.
To start i disabled the DHCP in the router from the cable firm and made my old router DMZ. So almost the old situation.
I thought it would be nice to connect the WAN to the cable-router and the LAN to my linksys (preferable due to the 1G ip interface).

But when i try to configure the WAN port in the bubba with static IP i cannot change the gateway adres and the dns adres. Do you have a tip how to configure this? (tip: DHCP of this port is disabled)

Rene

[Ubi]

are you *sure* it is disabled? I've seen my share of routers that say they do, but don't

what does /etc/network/interfaces say?

thanks

[pcrene]

Hello ubi,

I had my share of stess this eve...

I changed the network config en lost both ports...
Via a ip scanner i found that LAN was having 192.168.10.1 (remark) with dhcp active
Manually changed /etc/network/interfaces back.... So now up and running again..
Lost 5kg in weight due to stress...

Rene

Remark: internaly i use 192.168.0.x cable modem, 192.168.1.x router

[Gordon]

I'm trying to draw a picture of this but I'm not really getting what you're trying to accomplish. It seems you want to place the B3 (it is about the B3, right?) in parallel of your old router which now routes between the LAN and what has now been promoted to DMZ. You want the B3 WAN interface to have a fixed IP, but that does not make any sense because everything you'd want to expose to the outside will already be configured in your old router to run through the B3's LAN interface.

First off. There's no need to set a fixed IP on the B3's WAN interface. Today's smart modem/router combos all have a configuration option to assign a fixed IP to a specific device (identified by it's hardware defined MAC address) with the express intention to allow inbound traffic to reach the correct host. The one you got will probably allow setting this per service/port and maybe even protocol.

Second. I don't see any real benefit from keeping the old router in there, since the B3 will perform the exact same function. Unless of course you're generating a lot of internet traffic and require some sort of load balancing?

[pcrene]

Hello Gordon, Ubi,

Situation before last weekend:
Calblemodem that gave my linksys router an external ipadres bubba,pc,laptop,tv satelite connected to the internal 1G network

New situation:
The cable firm has send me a complete router with a cable connection. This cable connection has 4 RJ45 for internal use. On one of these ports i have connected the linksysrouter and made the linksys DMZ.
To get better insight of internet and internal trafic of the bubba3 i wanted to connect the WAN port of the B3 to the cablerouter and connect the LAN port to the linksysrouter (1G network for e.g. movies).

My linksys has internal ip range 192.168.1.X but due to the change in configuration the ip adres of the lan port became 192.168.10.1 (my stupid mistake). It took me a while to find this ip-adres so i could change the LNA port back to my orignal network.

via vnstat i can see now the real internet trafic and local trafic.

Rene

[Gordon]

So essentially this is about off-loading. You want the internet traffic that is generated on the LAN to pass through the linksys router and the B3 should only receive traffic that is meant for one of its local services.

Then you need to go into the configuration of the new modem and check if you can tell it to pass incoming traffic to a specific internal host (i.e. on your DMZ). You want this to be on a per service level and not just route everything to the B3.

Next, if you're confident this will work, reset the B3 to its normal network configuration on the WAN side and connect it to the modem. Find the "attached computers" page in the modem configuration and select the B3 listed there for editing. In most cases there will be a dialog that allows you to preset what IP the selected device should receive every time. Next go into the firewall settings on the modem and tell it to forward the ports you want to have exposed towards the B3. There should be nothing else to it.