I've got a "modem" - actually a BT HH5 running OpenWRT 19.07.3 in pure bridge mode.
I' ve bridged the connection following the instructions in the PDF guide linked at https://openwrt.ebilan.co.uk/viewtopic.php?f=7&t=163&p=1321#p1321 , basically creating an untagged VLAN on one of the modem's switch ports (I used the WAN port) and bridging that VLAN with the WAN (which has
unmanaged as its protocol and "bring up on boot" unticked).
The modem appears to connect fine as soon as the phone cable is plugged:
OpenWrt 19.07.3, r11063-85e04e9f46 ----------------------------------------------------- root@Modem:~# /etc/init.d/dsl_control status ATU-C Vendor ID: FF,B5,47,53,50,4E,00,10 ATU-C System Vendor ID: 00,00,30,30,30,30,00,00 Chipset: Lantiq-VRX200 Firmware Version: 126.96.36.199.1.1 API Version: 188.8.131.52 XTSE Capabilities: 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0 Annex: A Line Mode: G.992.5 (ADSL2+) Profile: Line State: UP [0x801: showtime_tc_sync] Forward Error Correction Seconds (FECS): Near: 0 / Far: 0 Errored seconds (ES): Near: 1 / Far: 0 Severely Errored Seconds (SES): Near: 0 / Far: 0 Loss of Signal Seconds (LOSS): Near: 0 / Far: 0 Unavailable Seconds (UAS): Near: 51523169 / Far: 51523169 Header Error Code Errors (HEC): Near: 0 / Far: 0 Non Pre-emtive CRC errors (CRC_P): Near: 0 / Far: 0 Pre-emtive CRC errors (CRCP_P): Near: 0 / Far: 0 Power Management Mode: L0 - Synchronized Latency [Interleave Delay]: 8.0 ms [Interleave] 8.0 ms [Interleave] Data Rate: Down: 7.519 Mb/s / Up: 821 Kb/s Line Attenuation (LATN): Down: 26.3 dB / Up: 10.3 dB Signal Attenuation (SATN): Down: 24.8 dB / Up: 0.0 dB Noise Margin (SNR): Down: 12.4 dB / Up: 14.9 dB Aggregate Transmit Power (ACTATP): Down: 20.4 dB / Up: 12.4 dB Max. Attainable Data Rate (ATTNDR): Down: 7.516 Mb/s / Up: 920 Kb/s Line Uptime Seconds: 19 Line Uptime: 19s
However, I am unable to pppoE through it from an external router, which is my ultimate goal. On the router, I created a WAN interface with protocol pppoE on a specific switch port, on the same VLAN number as the modem's (also untagged). When I press Restart on WAN interface (LuCI), I get ``Error: Connection attempt failed'', and here's what the command line interface tells me.
root@router:~# ifconfig (snip) eth0.200 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx inet6 addr: fe80::7ad2:94ff:fea1:ff5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:47 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:2922 (2.8 KiB)
There must be something escaping me. Can you help?