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Unusually high data usage megathread

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Regular Contributor

Re: Extremly High Data Usage

I think it is very unlikely that a TV would use 980GB in a day and I would be looking for other causes.  People tend to focus on things they do directly like watching TV, but that much data that fast is more likely due to a backup program, software updates etc. that may be happening automatically.  Also keep in mind that data on the meter may be delayed up to 24 hours, so something that appeared to happen on a given day may have really happened the day before.

 

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Contributor

Re: Unusually high data usage megathread

@sal826

 

I ran into a similar problem myself.  Wireshark on your LAN is fine for outbound analysis, or inbound if you're intentionally running some kind of "service",  but what you can't see is what is hitting your WAN IP from the cable modem perspective.  Modem might have a firewall that could be partially blinding you.  First, is it enabled, and then, is it responding correctly?  It's a more complex question.  Assuming your cable modem doesn't have a known exploit:

 

Consider a SYN attack.  If you have ANY port that will respond on your cable modem, a "not very nice" external user can send you a synchronize packet, your open port will respond with SYN-ACK.  Depending on the attack method, that packet from your modem will either go to a bogus IP, or they can discard it quietly on their end with a firewall rule.   In any case, the 3rd part of the handshake, the client ACK your modem expects -- never happens and times out, so your port is left in a half open state.  The object is to either cause a DoS, or exhaust your resources and force a buffer overflow.  Optionally, use the half open port for some other kind of exploit attempt or more complex intrusion attempt.

 

You'll find this to be a fairly effective method to generate a huge amount of data with limited external resources, and this is only one example.

 

First thing I'd do us use a utility like nmap from an external location and see if there is ANY response from ANY port on your external cable modem IP address and go from there.  Nmap should tell you "filtered", and not open or closed.  Filtered means zero response.  If you are actually running a service of some kind on your LAN and port forwarding, or using/allowing UPnP from internal devices, I'd be looking at that pretty carefully.  Hide in plain sight too?  Yeah, well....disabling ICMP is always a good idea and that is always another traffic source.  Script kids usually don't use the -Pn option in nmap for portscans so no ping response generally means a pass over, but not all the time.

 

In my case, I was able to cut traffic by more than half with draconian adaptive firewall rules and routing through a seperate firewall box before the cable modem.  Cable modems are not reliable firewalls.  If you do find a port that doesn't behave or a service you can't disable, sometimes you can forward the port off into the bit bucket (bogus IP), or let it hit an internal firewall directly with a port forward to a firewalled port (preferred).

 

Now I have another situation where the usage Xfinity reports, is actually LESS than what I honestly know I'm using.  Now where that delta comes from is really unknown.  Averaging error on their end?  Timing thing? Retransmit banking off something.....but only sometimes?  Unknown.  I can see every packet that goes out, or comes into the WAN interface.  I'm still trying to figure that out.  Maybe it's just a firewall artifact on my side..........

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New Poster

Re: Unusually high data usage megathread

Well, I'm 7 days into the month and I'm at 273gb.  That's averaging a reported 39GB a day based on the uasge outside the 24 hour delay.  39GB A DAY!!! Really.  In tired of seeing the same ole same ole default responses here by Comcasted of minimize this and minimize that, which minimizing the redundant repsonses would be good, lets do some math; averaging quality between 1080 and 4k, lets use 2K streaming roughly 3GB per movie.  So at 39GB/3gb per movie, that puts me roughly at  10 movies a day, give or take.  So even if the movie lenght averaged out to 2 hours per movie, that would be 20 hours a day watching movie.  Where does that make sense for someone working 8-10 hours a day with 1 kid in school and the other one napping half the day.  This data usage makes no sense at all given the data usage habits haven't changed since thee months of Sept, Oct, and Nov where I used roughly 500-600 GBs, A MONTH!  Then all of a sudden Dec and Jan are showing that I'm using double to triple that?  Nothing on my end has changed.  I reset my network ssid and password, I even swapped out the modem at the request of tech support, yet I get the same BS response that nothing can be done and that I'm using that data somewhere.  If this continues to show this kind of usage, I'll be forced to cancel my services and move over to the competitor.  I won't pay overages and I'm not switching to unlimited! The fact that comcast does nothing about all these people complaining about the same issue is just ludicrous.  At what point does comcast research the issue in their systems and stop looking at the user's modem reports or account usage reports?  There are signs of something more here that comcast is missing.  You've had previous instances of software updates on your end causing a miscalculation on your network.  Could it be a simliar issue?  Was there a software update at comcast recently that cause a glitch in your systems, AGAIN?  Why are so many people having the same issue?  This is not a sparse issue.  You should probably look into it further instead of continually suggesting people check their networks and usages and minimize this and that.  I didn't get internet to minimize my usage on it if I didn't change my usage habits.  Figure this out or you are going to lose more customers!

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Frequent Visitor

Re: Unusually high data usage megathread

Have they switched back to the new metering system that was shown to overbill customers?   I have noticed my usage is higher this month than the previous 4.  The only thing going on this month is Netflix streaming.   Maybe 2-6 hours per day due to multiple devices.  Yesterday  no one streamed anything and I still used 27 Gigs of data from the prior day.   I have Netflix set not to stream in HD.  How much data should Netflix use per hour?    According to Xfinity that should be 2-6 gigs per day.  

 

Between this constant need to monitor and try to figure out what is going on with my data, not having ACC Network AND a price increase, I am about ready to pay the penalty and switch back to my previous provider.  

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Regular Visitor

Re: Extremly High Data Usage

even now the January billing, From Jan 1- Jan 7th my google wifi app shows i used 65.8 GB and my xfinity account shows 132GB data used. Something is really off.

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Frequent Visitor

Re: Extremly High Data Usage

Why can we not see the data used when using apps through our xfinity box?   Also,  why can we not see how many gigs each device uses?  They show a percentage, why not the actual usage from that device?  Then we would know how much data a particular show/app is using.  

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New Poster

Re: Overcharges of 1tb

*** I HOPE THIS HELPS OTHERS ***

 

In October 2019, I received a notification from Comcast (Bay Area) to upgrade to a new cable modem that supports DOCSIS 3.1 to take advantage of higher Internet speeds. I upgraded to the MOTOROLA MB8600 in mid-November 2019.  In December 2019, I randomly (no notification from Comcast) saw my Monthly Data Usage exploded past 1 TB - we're consistently under <=200 GB/month.  Our Internet usage pattern did not change nor did we add any new devices and/or services. Without an explanation from Comcast, I reverted back to my old cable modem. Since then we have seen our Monthly Data Usage back to normal. I've concluded this to be a bug with Comcast and/or the cable modem software.

 

Here's an article on this, but doesn't look to be resolved: https://arstechnica.com/information-technology/2019/10/comcast-incorrectly-charged-2000-customers-fo...

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New Poster

Re: Overcharges of 1tb

Apparrently I'm not the only victim. . .  Two retired people here who consistently used less than 100 Gb/month with ATT. Now after switching to Xfinity for faster internet, all of a sudden we used 1052 Gb our first full month with no change to our usage habits. Ridiculous! 

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Silver Problem Solver

Re: Overcharges of 1tb


@grizz59 wrote:

Apparrently I'm not the only victim. . .  Two retired people here who consistently used less than 100 Gb/month with ATT. Now after switching to Xfinity for faster internet, all of a sudden we used 1052 Gb our first full month with no change to our usage habits. Ridiculous! 


Xfinity may use Internet data differently than ATT.  I signed up for Amazon Prime last month and my usage was higher because I watched several series like Jack Ryan.


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I am just a customer, volunteering my time to help other customers here in the Forums.
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New Poster

Data usage by device

Hello, 

I need a way to get actual data usage by device (not just a percentage.) Any help is appreciated. thanks!

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Contributor

What counts against data usage?

Looking for a robust write up of what counts against the Data Usage. I listed out some examples that would give you a idea of the information I am looking for.

 

Xfinity mobile phone using wifi calling on home wifi
Xfinity mobile phone using data on home wifi
Xfinity mobile phone using data on public home wifi
Xfinity X1 streaming Amazon Prime show through Xfinity application on home wifi
Roku BritBox streaming on home wifi

 

This is not complete, but tends to cover general areas. Apoligize if this has been asked and answered already.

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Expert

Re: What counts against data usage?

https://www.xfinity.com/support/articles/data-usage-what-counts-towards-my-data-plan



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New Poster

Unusual Data Spike/ Repoeted data use is wrong

Since last month when Xfinity inadvertently cut my internet off my account I have had almost double the daily data use as each day over the last 3 years. My internal router which all of my devices are connected to reports almost the same data use as Xfinity each month until now. Xfinity is saying I’ve used 200 more gb than my router and I’ve used more in two weeks than most months. Xfinity has not been helpful at all. I have 3 trouble tickets open but nobody ever responds to them. My MoCA Network has an incredibly high number of error packets according to the gateway but I can’t find anything else wrong. Anyone have any suggestions?
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Silver Problem Solver

Re: Unusual Data Spike/ Repoeted data use is wrong

My data usage jumped up once I started streaming with Amazon Prime, Netflix, YouTube, AppleTV, Disney+, etc.  And Peacock streaming is coming.


I am not a Comcast Employee.
I am just a customer, volunteering my time to help other customers here in the Forums.
Was your question answered? Mark the post as best answer!
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Regular Visitor

xfi usage is not tracking correctly

My home network usage is show very high activity, yet only 3 devices are connected and none are showing any significant activity.  Also my profiles are zero's when showing 24 hour activity.  My usage meter has been spiking with over 70 GB in one day and I am trying to track down the culprit.  But if usage monitoring does not work correctly, how am I supposed to do it?

 

I have done a hard modem reset by unplugging it.  changed my wifi passwords and made sure all laptops are off.

 

What am I missing?

Contributor

Re: xfi usage is not tracking correctly

@Annapolismike

 
I think this forum is going about it the wrong way.  You said hard reset of modem.  That's cool, but what modem specifically?  Unplug won't do factory defaults and you might want to do that too if it's been jacked.  Also, factory defaults might not be what you're looking for here.  Sometimes, there are really insecure settings -- you know, to make it easy for people.  They're not good usually.
 
Wifi passwords.  Sure.  Thats if your neighbor is dogging you which is unlikely with wpa2 unless you're using the SSID for a password, what about the default admin password for the router itself?  Change that too.  Also, while you're in there:
 
Disable ICMP
Disable UPnP
Disable Remote Access  to the modem of any kind (ssh, web, hopefully it has no telnet option)
Do Not port forward, unless you have that covered by "other means" with a real firewall. If you find port forwards or port trigging -- you've been pawnd already (world accessible).  Reset again.  Change the default modem password (not just the wifi).
 
Disable any kind of file sharing on the modem (Netgear ReadyShare specifically -- advanced -> setup).

 

Make sure the firewall is on.  If it's got a portscan block option, turn that on too.


Some modems have remote exploits.  Model would help.  What is it?  What firmware does it say.  Maybe there's something else to look at.  Netgear has decided NOT to fix some of them.  Government CERT warnings say not to use them at all.
 
70G is nuts on wifi in 24 hours unless you're trying to do that.  If you change the settings above, see what it is in the next 24 hours.  Other devices on your network can be exploited too.  Try the above and see if it helps.  Go from there.

 

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New Poster

Huge increase in DATA usage

I have been a Comcast customer for many years and never ever been close to a limit. Over 2019 I used an average of 220GB a month. December rolls around and I get an email that I am over the 1TB limit. The only change was i added Disney plus. I have since removed DIsney plus and still my data rate is off the charts. I purchased a new modem and setup an entire new network. Still my data rate is off the charts. Customer service has been NO help at all. I have scanned everything and replaced equipment at MY cost and still no relief.

 

I NEED HELP FROM MY PROVIDER XFINITY (COMCAST)

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Contributor

Re: Unusually high data usage megathread

Everyone assumes that the data is suddenly wrong.  What if it is actually right now and was incorrect before?  My router says I have used 450GB and Comcast is reporting 800GB.  This could be correct if my router isn't counting the Netflix app used through the X1 Box.  I guess I could test this by turning off wifi and seeing if the Netflix app still works.  But I'm too lazy.  I want Comcast to tell me what's going on.  That seems like a lot of data, but I would expect it to be a lot higher since it's a 65 inch 4K TV.  If the router is only reporting streaming to a phone or ipad then it makes sense.

 

Followup:  After looking at router data, it breaks it down further.  Of the 115GB Netflix usage, 87GB is used on the ipad (my daughter is a Friendsaholic). The rest are on other phones.  My wife and I use the app within Comcast.  All that data going to the big screen is not being counted by the router.  So the only question I have is, Does that app usage count against the monthly limit? I assume it probably is counted on the chart so the answer is Yes.  I live in a state with no cap, so I am good.  But I would bet that those numbers that you are seeing are legit.

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New Poster

Re: Unusually high data usage megathread

Hello!

I'm attempting to track exactly what's using the high data. I'm not sure if I'm doing something wrong or not. Would appreciate some assistance if at all