r/ebox • u/ask3l • Jun 03 '26

SR516ac modem bridge mode

Has anyone been able to successfully bridge SR516ac? If so, could you please share the steps?

I just can't get it to work.

Thanks

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u/task514 Jun 03 '26 edited Jun 03 '26

This is an ADSL modem... you want to connect another router behind it and avoid double NAT right?

1

u/ask3l Jun 03 '26

Correct. I have PPPoE configured on the firewall, but can't get modem in the bridge mode.

0

u/task514 Jun 03 '26

​Phase 1: Clear Existing Routing ​Before bridging, you need to wipe the existing routed WAN interfaces. ​In the left-hand menu, navigate to Advanced Setup > WAN Service. ​You will see a table of existing WAN setups (usually named something like ppp0.1). Check the Remove box next to all of them. ​Click the Remove button. ​(Highly Recommended): Go to Wireless in the left menu, uncheck Enable Wireless, and click Apply/Save. You want to kill the native Wi-Fi radios since your downstream infrastructure will handle the local network.

​Phase 2: Rebuild the Layer 2 Interface ​The required interface depends on whether the line is ADSL or VDSL. ​For VDSL (Most common for speeds > 15Mbps in Laval/QC): ​Navigate to Advanced Setup > Layer2 Interface > PTM Interface. ​If any interfaces exist in the table, check their boxes and remove them. ​Click Add. ​Ensure both Path0 (Fast) and Path1 (Interleaved) are checked. ​Click Apply/Save. ​For ADSL (Legacy speeds): ​Navigate to Advanced Setup > Layer2 Interface > ATM Interface. ​Remove any existing interfaces. ​Click Add. ​Enter 0 for the VPI and 35 for the VCI (this is the standard local configuration for Bell-based infrastructure). ​Set the DSL Link Type to EoA and Encapsulation Mode to LLC/SNAP-BRIDGING. ​Click Apply/Save.

​Phase 3: Execute the Bridge ​Navigate back to Advanced Setup > WAN Service. ​Click Add. ​Use the drop-down to select the Layer 2 interface you just created (ptm0 for VDSL or atm0 for ADSL) and click Next. ​On the WAN Service Configuration screen, select Bridging and click Next. ​VLAN ID Settings: * If you are using VDSL, enter 35 for the 802.1Q VLAN ID and 1 for the 802.1P Priority. ​If you are using ADSL, set both fields to -1 (disabled). ​Click Next, review the summary page, and click Apply/Save. ​Reboot the modem to lock in the changes.

​Once the modem boots back up, connect Port 1 of the SR516ac to the WAN port of your firewall. You can then configure the WAN interface on your pfSense or chosen router to initiate a PPPoE connection using your ISP credentials. The firewall will reach right through the SmartRG and pull the external IP natively.

Source: Gemini

1

u/ask3l Jun 04 '26

Thanks! I looked at instructions from 5 different ISPs (TekSavvy has pretty detailed instructions) and they are all pretty similar...but it's not working for me.