Hi,
My Hitron CODA56 cable modem has a management interface at 192.168.100.1 but is only accessible from an IP sourced from the same subnet. My LAN subnet is 192.168.30.0/24.
What is the best way to implement a routing rule to allow access to the modem?
Thanks.
Perfect, thank you. This is precisely what I had in mind.
We're you able to figure this out regarding this modem?
I just received this modem yesterday, ordered from Amazon. Onsale for $109. 2.5Gbps version.
The modem diag page isn't reachable from 192.168.100.1. All previous modems I've owned (Arris, TPlink) all had accessible diag pages. Is it just disabled by default on this device, or another way to access it? My main router is an Orange PI R1 Plus, using my own custom build of OpenWRT 23.05.2 built from image builder. All else works fine with my internet connection, just drives me crazy that I can't reset the modem remotely since all my network sits down in the basement in an enclosure.
I've tried this method with no luck.
Unless I am missing something.
Hi @kgoerbig! Yeah, I recognize you from the R1Plus dev forum... 
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Yes, I successfully setup the modem network interface and fw rules per the linked wiki on accessing the modem through the router. I also have the R1PlusLTS running my build of 23.05.02 ...
I looked at your screenshots but I think there is a couple additional settings in those config dialogues that aren't visible, so no way to verify...
Can you maybe include your configs?
I compared mine to what is displayed in your screenshots, the only items that may be relevant are - In the modem wan alias interface settings, is your netmask set correctly (255.255.255.0), and is the wan broadcast IP 192.168.100.255?
Good morning. I was working on mobile yesterday over wireguard vpn tunnel back home, hence I did not post screenshots of config. Here they are now for your reference:
Are you using BanIP? Also, have you tried reverting the config in Luci and doing it via cli -- uci?
I think the problem may be with your firewall zones -- looks like you've added one named modem which is not required per the wiki and is not part of my config. I just added the modem interface to wan zone covered networks.
I reset my configs back to default:
Copy & Paste verbatim from the wiki
Interface settings:
FW
And still won't load. I'm running out of ideas at this point.
The only thing that I see if that you don't have wan6 in covered networks nor interface firewall. Not sure if that is relevant ...
Running nmap from the router side, it can see it:
I think me and another user on reddit figured this out. It boils down to the firmware version that my modem presently has. How do I know what version firmware I have? Well I am a Comcast employee (in the survellance dept). I polled my modem, and apparently is stuck on an older firmware/bootfile:
d11_m_coda56_extremespeed_c01.cm
DOCSIS 3.1 Cable Modem HW_REV: 1A; VENDOR: Hitron Technologies; BOOTR: CGM2.86C.674242.R.2204071414.F; SW_REV: 7.2.4.7.1b2; MODEL: CODA56
Firmware version 7.3.5.0.1b2 enables the GUI. I'll have to track down the ENG group that has control over bootfiles. I wish I'd know that yesterday, it would've saved me going around in an endless loop.
**EDIT **
12-16-23
The 7.3.5.0.1b2 firmware upgraded on my device after another hard reset today. Must of been pushed out last night.
Wow! That is the firmware version in my system info - SW Version 7.3.5.0.1b2. Fortunate, given the headache and frustration that kind of stuff can cause 
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Nifty sleuthing - on the upside, hopefully this experience and ensuing knowledge will be helpful to others in avoiding the same quandary!
Now I'm just waiting for mid split speeds too be available in my area ... .
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