ASUS xDSL (PPPoE) Bridge Mode

[UK Sentinel]

ASUS xDSL (PPPoE) Bridge Mode

Applies to the following xDSL Modem/Routers – is applicable for DSL-AC68U, DSL-N66U, DSL-N17U, DSL-AC56U, DSL-AC52U, and DSL-N16.

PPPoE stands for Point-to-Point Protocol over Ethernet, a network protocol for encapsulating Point-to-Point Protocol (PPP) frames inside Ethernet frames. It is used mainly with DSL services where individual users connect to a DSL modem over Ethernet.

ASUS xDSL Modem Router combos can be configured to operate in PPPoE Bridge Mode thus enables the ASUS device (Modem/Router) to act as a Modem only and allow other devices to connect directly to the PPPoE connection (router) and obtain the IP Address directly.

To set your device to work in bridge mode, please go to WAN – Internet Connection.

If you are using VDSL mode, please find your VLAN ID first. If 802.1Q is disabled, just ignore it. If 802.1Q is enabled, remember your VLAN ID, for instance 101.

Now please:
set “Service Unit” to “Bridge #1” (or any other you like)

set “Enable” to “Yes”

If you have VLAN ID:

set “Enable” of 802.1Q to “Yes” and fill in the VLAN ID, for instance 101.

And press “Apply” button.

Then go to LAN – IPTV, please choose IPTV STB port, check “Remove VLAN TAG from WAN” option, and press “Apply”.

 

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[Lax]

Sorry for reviving this old thread. I tried to put my DSL-AC68U to bridge mode. However, the option is not there.

I can only create a bridge for IPTV.

But not for the internet connection where the client does the pppoe authentication.

Can anyone confirm this?

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[UK Sentinel]

Bridge mode for DSL-AC68U was removed a while back I believe.

Try  PPPoE Relay is enabled ?

WAN > NAT Pass through

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[Lax]

Hmm, they still advertise this for dsl-ac68u on their support page.

https://www.asus.com/support/FAQ/1015722/

My ISP doesn’t let me connect with more than 1 client. So relay is out of question.

I have found another workaround though. It just is not ideal and I don’t want to use it.

In IPTV settings you can strip vlan tag with that checkbox “Remove VLAN tag from WAN” then select a port. Connect your router to that port. Then create a bridge IPTV connection from WAN, internet connection. Remove the internet connection such that only bridge IPTV remains.

After that, your router takes it over. But it just is not transparent enough for me to see what is going on. So, I cannot trust it.

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[UK Sentinel]

I did load the latest firmware for the DSL-AC68U – DSL-AC68U-300438641995 – and the Bridge mode option was not available.

On your DSL-AC68U – under WAN remove the PPPoE Account Authentication and password detail and then that may allow you to connect another router / device and use ISP authentication there ?

 

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[Lax]

Yeah, I will try that and see how it will handle it but without bridging dsl modem I would be a pride owner of shiny new double NAT.

I guess DMZing my router IP can fix that. Though, I am not sure what would be the implications.

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[UK Sentinel]

I believe PPPoE Relay does not use NAT as the PPPoE device will get its own IP adddress etc

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[Lax]

Nope, I have to use NAT with ac68u with pppoe relay because, I need to identify the dsl interface using ac68u with Vlan ID because my ISP uses 802.1Q.

I have a rt-ac5300 behind dsl-ac68u and I cannot set Vlan ID with rt-ac5300. There is no 802.1Q setting on the ac5300 router.

Disabling NAT on the WAN/Internet Connections on AC68U doesn’t help either because I lose internet connection with NAT disabled.

Here is what I did.

On AC68U,

I enabled PPPoE relay.

Connected LAN 1 of AC68U to WAN of RT-AC5300

Changed the IP address of AC68U to 192.168.0.1 (using similar DHCP range)

On DHCP server I assigned a static IP to RT-AC5300 WAN MAC so it is easy to access.

AC68U WAN settings are attached.

I had to use automatic IP here but I don’t know how correct it is. Any idea?

AC5300 WAN settings are attached.

According to logic I should be behind double NAT. However, I checked and apparently I am not. Well, at least I can access my devices just fine without any port forwarding on the ac68u.

Also, I get the attached warning message on the DSL-AC68U GUI with these settings.

“Your ISP’s DHCP does not function properly.”

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Attachments:

1. 

   ac68u-WAN-1.png
   

2. 

   ac5300-WAN-1.png
   

3. 

   warning-1.png
   

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[UK Sentinel]

Great news in that you now not having double NAT issues and hopefully all working well

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[Lax]

Yeah, thanks for helping out and clarifying things. Asus faq site was misleading me.

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[UK Sentinel]

As an update, seems the DSL-N16 still supports ‘Bridge Mode’

N16 & tuf gaming AX 5400

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[Author]

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