CGN3ACSMR Bridge Mode - Port 1

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Resident Expert
Resident Expert
Posts: 14,189

Re: CGN3ACSMR Bridge Mode - Port 1

There is only about one scenario where i would see it possibly properly in use.
(likely what I will do when I switch to bridge mode).

 

I currently have smart home monitoring, with the seperate Netgear router.
Its currently plugged into the CGN3 in NON bridge mode.

My modem is in the basement, My router (even when i switch to bridge) will be upstairs, and dont want BOTH wireless right beside each other (for lessening interfearance, even though on different channels).
What i would likely try then..
Is leaving the port one running up to my ASUS.  Then in the 2nd port, the netgear.
It can get a seperate external IP, etc.  It doesnt have to have any other communication to the rest of my existing network, etc.



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Rogers Employee
Rogers Employee
Posts: 992

Re: CGN3ACSMR Bridge Mode - Port 1

But if it's not in a bridge mode. it doesn't get a external IP. At least that's what i thought...

man this networking stuff is confusing to me 😕
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Resident Expert
Resident Expert
Posts: 14,189

Re: CGN3ACSMR Bridge Mode - Port 1

Yes, sorry should have explained better.

In my current setup, it doesnt get an external, you are correct.


But when i DO, it would have its own 🙂



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Rogers Employee
Rogers Employee
Posts: 992

Re: CGN3ACSMR Bridge Mode - Port 1

Oh okay, that makes sense - I am trying to think of why an secondary external IP would ever be needed.
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Resident Expert
Resident Expert
Posts: 6,749

Re: CGN3ACSMR Bridge Mode - Port 1

A second IP address could be usefull if you wanted to run the Home Monitoring on its own network as Gdkitty indicated, or if you wanted to use a separate VPN service and not have it interfere with the rest of your home network.  Or you could use one network with Open DNS and another network with the Family Open DNS address which filters IP addresses for kids.   There are probably other uses that are possible that don't come to mind at the moment.

 

The big question is whether or not the modem will be stable in Bridge mode with two networks running their own IP addresses.



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Rogers Employee
Rogers Employee
Posts: 992

Re: CGN3ACSMR Bridge Mode - Port 1

Very interesting.
VPN service has my interests.
Actually Datalink i'll be sending you a PM about a specific question...
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I Plan to Stick Around
Posts: 135

Re: CGN3ACSMR Bridge Mode - Port 1

I am using the 2nd IP with my Linksys VoIP adapter since it is also a NAT router I was not concerned with securing it behind my firewall.  This way I do not need to mess around with port forwarding on my firewall and I can tinker/upgrade etc my firewall while keeping the phone running. 

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Resident Expert
Resident Expert
Posts: 6,749

Re: CGN3ACSMR Bridge Mode - Port 1

@sbenninger what modem are you using in Bridge mode and, have you had any issues with modem stability, given that it's supplying two IP addresses?



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I Plan to Stick Around
Posts: 135

Re: CGN3ACSMR Bridge Mode - Port 1

Sorry should have mentioned i have an older CGN3 with no issues with stability using the second address. Doesnt really help the original poster...was just adding another use case for 2 ip's.

 

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Rogers Employee
Rogers Employee
Posts: 992

Re: CGN3ACSMR Bridge Mode - Port 1

Ah touche, 2nd IP would be useful for Voip since it won't have echo effect or latency due to firewalls and routing (if set that way).
Neat. Thanks @sbenninger 🙂