Comcast Router and SNMP

(this is a guest post by Antoni Sawicki aka Tenox)

This is a lame duck, low effort post. And if you already know it it’s obvious. However this question seem to be asked a lot on the intertubes. I hope it will help someone else, as there is no good readily available answer out there.

Problem: I wanted to have SNMP on my Comcast/Xfinity router so I can monitor current bandwidth usage.

Research:

  • Possible to enable on vanilla router? – Nope
  • Do 3rd party, Comcast compatible routers do? – Nope
  • Can you SSH or hack in to the router to do it? – Nope
  • Can you load custom / hacked firmware to do it? – Nope*

Nope or very hard / unsupported.

So is it possible at all? Yes, but with a separate device. Comcast/Xfinity routers have so called “Bridge Mode” which essentially turns them in to a DOCSIS modem without router / firewall / wifi access point.

Solution: Turn on Bridge Mode in your vanilla Comcast router and buy a WRT firmware router / access point. I got Linksys AC3200 for $99 on Amazon. Ssh to the router and run: opkg install snmpd

Done.

3 thoughts on “Comcast Router and SNMP”

    1. Whether you own it or rent it it’s not really relevant. My point is that I have not found a modem/router combo that is officially supported by Comcast and has SNMP or WRT/Linux firmware. You have to use separate modem and router. Own or not.

      1. Correct, because the cable provider controls the firmware on combined cable modem/routers. Running your own router is always the best way to go and the most secure. There are tons of gateways out there (both owned and rented) that have un-patched/outdated firmware because the provider refuses to push the newer firmware out.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.