- 08/07/2014 at 11:40 pm #71097
Anyone else getting super slow internet speeds today? (Thursday) My Comcast connection is supposed to be around 20Mbps and it’s only 2.68Mbps according to Speed Test. I already rebooted my computer and power cycled the cable modem and router. No change, slow as molasses.08/08/2014 at 5:43 am #71100
Did you get your new modem? I got mine but haven’t switched it yet. They claim it will make things super speedy again.08/08/2014 at 9:58 am #71104
Probably want to turn off the xfinity wifi public hotspot “feature” when you provision that shiny new modem. No use sharing already limited bandwidth at your house with folk cruising by on the street.
FWIW, on my monthly war drive (on the 4th), I saw 5 times as many “xfinity wifi” hot spots show up as 2 months ago in residential areas, so Comcast is definitely rolling it out, but sorta slowly. The prior post I made: http://www.myballard.com/forums/topic/xfinitywifi-public-hotspots-showing-up/08/08/2014 at 11:32 am #71109
Hmmm, a new modem? I own the one I am using, it’s a Motorola Surfboard SB6121 that I got less than 2 years ago. I guess I’ll attempt to talk to Comcast technical support or just go to Best Buy and ask them there. If I have to buy a new modem I’m guessing that Comcast will have to come out to set that up and charge me for a house call….grrr…
Thanks for the tip about new modems, I had no idea I would need to get another one.08/08/2014 at 12:18 pm #71111
The 6121 is a fine modem and most likely not the problem
Before calling Comcast, log on to the modem (192.168.100.0)
All the boxes should say done, except for “Cable Modem Status” that should say “Operational”
If that is ok then check the Signal (upper part of the screen are the tabs)
You should have 3 or 4 downstream channels
the Signal to Noise Ratio should be 30dB or higher and the power lever should be 0 dBmV +/- 5
The upstream channels should have a power level of less than 45 dBmV
If there is a problem with those #s above – then is is most likely the pigtail from the wall to the modem (check that it is tight – you need to refresh the browser for the data to update)
If they all are OK then check the “logs” (if there is a warning MIMO Event MIMO that is ok)
If all that seems ok – you can go to the config tab and “restart the cable modem)08/08/2014 at 12:46 pm #71113
OK, well I figured it was not the modem after checking online to see if it was still a current model which it is. So, I just spent the last 30 minutes or so with Comcast online chat while their tech checked my modem signals remotely and then sent something or other to it in order to fix the problem. He said it will take another 30-60 minutes before everything is synchronized and the speed is back up. I have no idea why it would have plummeted though, that’s what I find kinda weird. He said that my signal was very unstable, in the red.
Richy – Thanks for the extra info. I’m not even sure how to log onto the modem though. It’s probably in the control panel settings, I’m on a Mac. If the Comcast fix doesn’t work I’ll try following your advice and see how things are setup. I seem to have some vague memory of changing that stuff eons ago when I had dial-up service on another computer. Thanks!08/08/2014 at 2:29 pm #71122
Disclaimer: I don’t have Comcast anything.
If Richy’s instructions don’t work to bring up your SB6121 status/information/configuration/whatever, try the following URL in the browser of your choice: http://192.168.100.1
That’s what worked at a neighbor’s house several months ago. I would guess given that 192.168.100.0 works for Richy and 192.168.100.1 worked somewhere else, that there might be some variability in the final “octet”.08/08/2014 at 3:27 pm #71125
Download “inSSIDer 4” http://www.inssider.com/downloads/
It’s a great program that shows all of the wifi networks around you and what channel they are all on. Switch to whatever channels your neighbors are not on.08/08/2014 at 6:10 pm #71136
Clamster – I hope your internet connection is now back to normal. However if it is not here is my 2 cents.
We also have Comcast, we have had it for many years. We have had a Comcast telephony modem and our own D-Link PowerLine WiFi router, we pay extra for the 50 Mbps Boost. Early this year we started having problems with the internet connection, TV was fine, but we kept loosing the internet link. I called Xfinity tech support and they walked me through all sorts of reboots and cable unplugs that did not work and so I eventually went up to the store on Stone way and got a new telephony modem, an Arris TM822G. Last month we started having the same problems again, and went through the same phone calls and I went and traded the Arris for a Ubee DNV3203B. I installed that modem and it worked fine for about a week and then we had the same problem, Internet speed kept slowing down and then loosing the connection and rebooting. I called tech support and we went through the same routine and eventually they said all I could do was get a tech out to check the connection. So I did that and it turned out that we had a 2 way splitter in the box outside that had a short. He replaced that and all is now good.
FYI, regarding gnoman’s post, you will only have a “WiFi hotspot” if you have a newer Xfinity router/modem, by default the “free” access is on, you can, apparently call to have that turned off. If you just get a modem without a built-in router, like we have, you will not have a “free hotspot” at your home.
And Richy, FYI not all Comcast modems are accessible via 192.168.100.0 like gnoman states, some are at 192.168.100.1 like my new one is and it also requires a user name and password! Those can vary by modem model, check here for combinations:
Hope this helps.08/08/2014 at 6:48 pm #71137
VB, I know – I made a misprint – but have not been able to post08/08/2014 at 6:48 pm #71138
till now, and only one liners08/08/2014 at 6:49 pm #71139
If it is still slow – I would still check the jumper to the modem from the wall (#1 problem)08/08/2014 at 10:20 pm #71145
Of course I’m feeling dumber with every new post here!
I got the new router because they notified me of it. Is that weird?
I wish I could hire someone to walk me step by step through canceling cable, improving my internet and getting hooked up with online programming. I am so lost about all of this :(08/08/2014 at 10:22 pm #71146
About 90 minutes after I chatted with the tech it looked like they remotely rebooted my modem so that whatever changes they did would take effect. I just checked Speed Test a few minutes ago and it’s mighty speedy now, even faster than before the slowdown happened and a bit higher than the advertised Mbps for the level I pay for. Totally surprised they fixed it actually. So all is well for now. Thanks for all the great info, suggestions, and advice, that InSIDDer4 program looks cool. I will definitely save what you guys posted for future use. I’m still not sure what they changed, I’m guessing they remotely changed the channel I was on (?). Anyhow, all’s good again, yay! Thanks!08/08/2014 at 10:33 pm #71147
Curtis – I agree, it’s a lot of detailed stuff to know and figure out. I worked in the software industry for 25 years and this network stuff is still beyond my scope. I did a lot of online research before signing up with Comcast 2 years ago and a lot of research on the cable modems, buying versus renting theirs. Decided to buy my own plus a wireless router. To their credit, Comcast has been good about fixing things although the initial install was done completely wrong and then they charged me for coming out to fix their bad work and I had to pay it even though I was not supposed to be billed otherwise my account kept saying I was overdue and it took several months for the refund/credit to come back. So that was annoying but they completely rewired everything inside and out. So far I’ve had good luck doing the online tech chat that you can get to in the Customer Service section after you log in to their site. I have internet only, haven’t even looked much at online movies or programming but am thinking of getting a ROKU or AppleTV box.08/08/2014 at 11:26 pm #71149
@clamster, if you have an android smartphone, there’s an excellent similar app which is free: Wifi Analyzer. https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer&hl=en It’s quite cool in that you can quickly check signal strength in multiple rooms. This was very useful in determining the best channel to use in one of those 4 plex buildings.
A word of advice, however is that there is usually not much overlap on the 5 GHz bands, and the routers/access points can detect interfering signals as well, and change their channel automagically. If at all possible, I would recommend settling on the 5 GHz bands in your router, and disabling the 2.4 GHz band entirely. Almost any device made in the last 3 or 4 years can connect on the 5 GHz band, and there are many more channels available.
My 2 cents.08/09/2014 at 8:37 pm #71166
It was a Comcast system wide issue. Should be fine now.08/09/2014 at 11:19 pm #71168
gnoman is right that the 5GHz band usually has much less interference trouble than 2.4GHz (also because so few people have yet upgraded to use the 5GHz band). However, 5GHz is much more sensitive to walls and buildings; I notice that the 5GHz signal my Kindle sees drops from Excellent to Good when I’m two rooms away from the router; on 2.4GHz, the signal remains Excellent. You’ll have to experiment to see what works best in your situation.08/11/2014 at 11:04 pm #71243
Sorry to drag this thread up again but once again my modem started the reboot scenario! Saturday our connection started dropping on and off, re-boots of modem and router, connection speed was as low as 2 mbps! Same thing Sunday. Today I called Xfinity and went through the whole thing with then again, no improvement so I set up for a tech to come out tomorrow. Within a couple of hours our connection was stable and has not dropped since, Speed is up to over 50 mbps and all seems to be well, but I still have an appointment for a tech visit tomorrow!
The only thing that is bothering me and this is the question I have is that the connection on the back of the modem where the coax cable connects is VERY hot! almost too hot to touch! Can one of you out there that has an Xfinity modem, Ubee if possible, check that connection and tell me if it is really hot on your modem?
Thanks08/12/2014 at 7:08 am #71247
VB, it should not be HOT, there are a few things that could cause this – keep your tech appointment and make sure you tell them about the modem.08/12/2014 at 8:51 am #71253
Richy – thanks, will do. What things can cause the connection to get hot?
Interestingly the modem has now been up since yesterday and we are speeding along with seemingly no problem and all I did was re-boot the modem one more time!08/12/2014 at 9:17 am #71256
The original problem could have been some urgent network maintenance that was not known by the call center (most likely), or a failed firmware push to your modem (norm happens between 11pm – 4am), this is what may have happened to clamster.
The heat problem could be just your modem failing – power supply problem (most likely), or a faulty house ground – the cable is grounded to earth ground (Comcast is pretty anal about that) and if you have an older house, electricians (or homeowners) sometimes used the cold water inlet as the electrical ground (against code for the last 50 yrs or so, still it happens) and if your pipe starts to corrode the house may look for another ground – your cable – this happened a lot in the past or the modem connection could have been in direct sun light and got hot from that – all is best to have checked out –08/12/2014 at 10:39 am #71258
When mine was originally setup, unbeknownst to me they grounded the cable to….my gas line!!! It was just by coincidence that the repair guys from CenturyLink were at the house the next day and alerted me to the problem and potential hazard (lightning strike > fire > exploding house). It was fixed within 24 hours which was a good thing because there was was a big lightning storm the very next day. (Speeds are still good with my setup.)08/12/2014 at 10:07 pm #71312
VB, did the tech show up and was the problem solved ?08/12/2014 at 11:49 pm #71313
Richy – yes he did and this guy was good. He listened to me and checked the cable coming from the street and guess what.. it had water in it! I knew that the problem was not in my house, and that cable is from the 80s and old. He couldn’t get up to the wire on the street with his ladder as there is a tree in the way so we have a bucket truck coming out tomorrow. He replaced a couple of corroded connectors and even that made the connection better. He said that the modem coax connector was probably hot from the modem struggling to keep the connection up and over working, it is a bit cooler now. Tomorrow will tell if the new cable will be the fix. Thanks for checking back.
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