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Trying to Bridge my XFINITY XB3 (modem/router) with my ASUS RT-N56U.

MrStealYaGrl 13 10 January 13, 2015 at 05:10 PM
I want to have my RT-N56U upstairs and wirelessly bridged to my XB3 so that I do not have to have a 50 foot ethernet cord running from downstairs to the upstairs room.
Does anyone know how to do this?

This is my understanding:
Set the XB3 (modem/router) to BRIDGE ONLY.
Copy down the MAC.
Set the N56U as WAP ONLY (Wireless access point).
Copy down the MAC.
Enter the MAC of the XB3 in the MAC list for the N56U.
Enter the MAC of the N56U in the MAC list for the XB3.

Is this true? Some expert guidance would be appreciated.

Follow-on question: Lets say I do get this bridge working, will the connection from the N56U have the full speed? or HALF the speed?

Thanks!

7 Comments

1

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Joined Mar 2004
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#2
If you set the XB3 to bridge mode that just bridges WAN to LAN (LAN/Switch to WiFi is usually automatically bridged in these devices), basically for passing your public IP directly to a router. It may be technically possible to do what you are asking, but overly complex.

The simpler approach is this. XB3 operates normally, you even set it up as a DHCP server. Then the N56U has to act as a repeater with DHCP turned off. However, with stock firmware on the Asus it may not be possible. There is no official release DDWRT firmware available, however there seems to be a third party firmware called Padavan [google.com] which is capable of acting as a repeater.

If you do get this working you will suffer a speed drop when connected through the Asus box. It requires half the bandwidth to transmit to your device and half to transmit back to the XB3, this is standard with all repeaters. The real question here is why you are not using the Asus box downstairs, are you having a signal issue?
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#3
what you listed is if you don't want to use your xfinity router as a router (just a modem). since you said bridge and talk about up stairs I assume you want to put the 2nd access point up stairs and that process will be different.
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#4
Quote from MrStealYaGrl View Post :
I want to have my RT-N56U upstairs and wirelessly bridged to my XB3 so that I do not have to have a 50 foot ethernet cord running from downstairs to the upstairs room.
Does anyone know how to do this?

This is my understanding:
Set the XB3 (modem/router) to BRIDGE ONLY.
Copy down the MAC.
Set the N56U as WAP ONLY (Wireless access point).
Copy down the MAC.
Enter the MAC of the XB3 in the MAC list for the N56U.
Enter the MAC of the N56U in the MAC list for the XB3.
NO! NO! NO! NO! NO!

For what you're trying to accomplish, you don't want to set the comcast gateway to bridge mode. I'd recommend flashing the RT-N56U with a version of Tomato or DD-WRT and setting it to act as a wireless client-bridge. You could also go for a set of HomePlug AV/AV2 powerline networking adapters.

There is a something called WDS that would involve similar setup to what you described (and is kind of a pain), but you generally aren't messing with any settings that refer to bridging when you set it up. Bridging can mean / apply to a few different things so you have to be a bit careful. These methods to extend a wifi network reduce network throughput.

It sounds like your real problem is you're wifi isn't getting the job done, there may be simpler and more effective things you should try first (more information needed).
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#5
Quote from jkee View Post :
NO! NO! NO! NO! NO!

For what you're trying to accomplish, you don't want to set the comcast gateway to bridge mode. I'd recommend flashing the RT-N56U with a version of Tomato or DD-WRT and setting it to act as a wireless client-bridge. You could also go for a set of HomePlug AV/AV2 powerline networking adapters.

There is a something called WDS that would involve similar setup to what you described (and is kind of a pain), but you generally aren't messing with any settings that refer to bridging when you set it up. Bridging can mean / apply to a few different things so you have to be a bit careful. These methods to extend a wifi network reduce network throughput.

It sounds like your real problem is you're wifi isn't getting the job done, there may be simpler and more effective things you should try first (more information needed).
Man, thank you very much.
This was very very helpful! Much appreciated
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#6
Quote from MrStealYaGrl View Post :
Man, thank you very much.
This was very very helpful! Much appreciated
It could be helpful if you told us about your wireless problems.

It might be as simple to improve you wifi as changing to a channel with less interference (pick between 1, 6, and 11).

As others have suggested, you might want to just connect your Asus RT-N56U router to your cable gateway with an ethernet cable and turn off the cable gateway's routing/wifi functions (this is often done by switching the wan mode to transparent bridging). If you do this and mess up your ability to get to the internet you can see if you can access anything by going to 192.168.100.1 or you may have to reset your cable modem's settings by holding the reset button for up to 30 seconds (find the manual online).
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#7
Set your comcast to bridge only and DMZ all ports to the ASUS.
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#8
Powerline adapters will work in this situation. U should get near to max speed. Might sure u find the "two" better outlets. Otherwise your choose is to leave the rt-n56u with the xb3 and get something like openmesh. U can mesh u house or apartment. Linking multiple device for wifi and lan.
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