[Modem Request] Arris G54

[MrAct1on]

Modem Model

G54

Manufacturer

Arris

Modem IP Address

10.0.10.1

Authentication Required

Yes - requires username/password

Authentication Details (if required)

Login type: Basic Auth popup
Username: email
Password:

• before setup: andcake392
• after setup: generated by surfboard app
  Notes: login at /cgi-bin/luci/

How are you providing data?

Fallback Mode + Capture HTML (Recommended) - Used built-in capture button

Files Attached

Preferred capture method from Fallback Mode

arris-g54-html-capture.json

Additional Information

No response

Checklist

• I have used Fallback Mode + Capture HTML, OR sanitized my files to remove PII
• I have searched my capture file for my WiFi SSID and password to verify they're not present
• I understand this may take time as it requires developing a custom parser
• I'm willing to test the parser once it's developed

[ChBi89]

I just checked your json, as when i tried this with my Arris CM3500B it did not contain much useful information.
It seems it is the same here. It seems to try some URLs but most of them return a 404 Not Found status code.
I then used the instructions to create a sanitized har file, which has all information except some missing details on authentication.

It might help @kwschulz if you could provide that aswell. See https://github.com/solentlabs/cable_modem_monitor/blob/main/docs/MODEM_REQUEST.md#option-2-har-capture-script

@kwschulz hope my advice is not totally wrong and my commenting not overstepping, please let me know if it is

[kwschulz]

Thanks for this, and thanks @ChBi89 for jumping in to help! Unfortunately the capture doesn't have what we need to build the parser.

The main issue is that the capture wasn't authenticated - the modem's web interface is behind a login, so all we got was the login page. Without getting past that, we can't see the DOCSIS status pages where the channel data lives.

Looking at the HTML, the G54 appears to be a gateway (modem + router combo) running LuCI (the page references "LuCI - Lua Configuration Interface"). The "Capture HTML" button probes standard modem URLs like /status.html, but the G54 uses LuCI paths like /cgi-bin/luci/admin/... - that's why you're seeing all those 404s on top of the auth issue.

I'll need a HAR capture that records you logging in and navigating to the DOCSIS status pages:

git clone https://github.com/solentlabs/cable_modem_monitor.git
cd cable_modem_monitor
pip install playwright && playwright install chromium
python scripts/capture_modem.py --ip 10.0.10.1

When the browser opens, log in and find the Connection or DOCSIS Status page (probably under a "Gateway" or "Status" menu somewhere). Close the browser when you're done and attach the .sanitized.har.gz file here.

Since this looks like a unique interface, it'll likely be a new parser from scratch - the HAR will show me how the auth works and where the data is.

[MrAct1on]

I think I did this right. Here you go!

modem_20251219_210456.sanitized.har.gz

modem_20251219_210456.zip

[kwschulz]

Parser ready for testing! 🎉

Thanks for the thorough HAR capture — this turned out to be a really interesting modem.

What makes the G54 special:

• First LuCI (OpenWrt) parser in our collection — all our other modems use HTML scraping or HNAP
• First retail Xfinity-compatible modem in our fixtures
• Newest modem we support (2023 release, 3 years newer than the next batch)
• Uses JSON API endpoints instead of HTML scraping — much cleaner to parse

The parser is on feature/v3.11.0, targeting Tuesday. It should parse:

• 34 downstream SC-QAM channels
• 2 downstream OFDM channels
• 5 upstream SC-QAM channels
• 2 upstream OFDMA channels
• System uptime and firmware version

Next steps:
When v3.11.0 drops, would you mind testing and confirming the values match your modem's web UI? Once verified, we'll mark the parser as verified and close this out.

Thanks again for contributing — your G54 opened up a whole new protocol category.

[MrAct1on]

I'd be happy to test! Thank u again!

[kwschulz]

Quick update - release pushed to next week due to holidays. Happy holidays!