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Read cable modem status through router?
June 29, 2014 1:24 PM   Subscribe

Is there a wireless router that can tunnel http to 192.168.100.1 so I can read my cable modem's Signal and Log pages?

I have three noisy downstream channels (SNR dB of 26 to 30) of 8 total in use on a Motorola Surfboard 6141 that I'd like to be able to monitor without having to connect a desktop directly to the cable modem. I can share my internet connection to other clients from the desktop, but it wastes energy and is a security risk. I'm monitoring to see if lower SNRs (and increasing Total Uncorrectable Codewords counts) correspond with poor internet connectivity. (they seem to)

Even better would be some way to periodically save the signal-to-noise values. Comcast's coming Tuesday to inspect the drop and outside wiring, but it's always nice to have a definitive answer when the connection's acting up even if this immediate problem is resolved.

I'm open to using OpenWRT or DDWRT, but I'm hoping to avoid learning too much about this. I have the ability, but not the time. I can write a screen-scraper in Python to grab SNR values, but I don't want to.

Incidentally, 5 of the channels never have this problem, but there's no configuration option to reduce channel bonding to only use 1 or 2 or 4 channels that I can find.
Model Name: SB6141
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.10-SCM00-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 7.0
posted by morganw to Computers & Internet (7 answers total) 1 user marked this as a favorite
 
If you do choose to use ddwrt or tomato, they can access the modem. See this for ddwrt or the 'Route Modem IP' option for the toastman/shibby builds of tomatousb. Perhaps the stock firmware on your router has a similar feature.
posted by palionex at 1:36 PM on June 29


Have you tried just accessing the modem without doing any special router configuration? Unless your LAN happens to be using 192.168.100.0 (or you have a multiple subnet config with a 255.255.0.0 mask) most routers should automatically forward requests for 192.168.100.1 on through the WAN port. It works that way at my house (Tomato router) and at lots of other sites I administer (SonicWALL, Linksys, Netgear, Fortinet.) Go ahead, give it a shot.
posted by contraption at 2:09 PM on June 29 [4 favorites]


my interior network is 192.168.1.0/24, and I'm able to reach my cable modem's NAT at 10.0.100.0/24 when running openWRT; I think Contraption is right.

You could also set up a static route if needed, but your router should see the dmz as a routable address, since that's where the WAN gateway lives from it's perspective.
posted by jenkinsEar at 2:20 PM on June 29


I can't say I really understand why (I don't think I did anything?), but this works fine for me on a just a typical airport, I just go to that address in my browser.
posted by advil at 2:23 PM on June 29


We have a Surfboard modem, and I can reach it with the link contraption gave.
posted by kathrynm at 5:20 PM on June 29


I've done this on OpenWRT by assigning a secondary IP in the 192.168.0.0/24 range on my WAN port. It doesn't work on my setup without making that accommodation.
posted by Good Brain at 5:49 PM on June 29


> this works fine for me on a just a typical airport

Oh, um, yep, it does on mine too. Couple/three year old Airport Extreme. Nice to know that the *WRT setup is simple because a Buffalo Tech device that supports 802.11ac and DD-WRT will be my next one.
posted by morganw at 8:47 AM on June 30


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