Gigabit service running at 600Mbps... Multiple calls (details)

south florida here. so i guess not. and this has been bugging me all year. I was hoping it was just work they were doing in the area. but they shut down everyone's internet here overnight a few nights ago, and I was hoping that would fix the issue, but no such luck. this really irks me because it has happened every single time I get stuck with a Comcast modem. Years ago I created an excel spreadsheet to log all my calls and issues with Comcast, and I'm currently at line 1082, dating from 2014 when I first decided to start logging until now in 2020.

Everytime I use a Comcast modem, it works for awhile, and then it just doesn't. And the only thing Comcast does it either swap out the modem for another one, or blame it on my own equipment. And I would have to give up a lot in order to switch to a different provider.

afkouns

Hopefully they would get that fixed if it is in fact a node issue.

I had a tech try and show me a his graphing tool over an iphone reporting signal ingress when I had techs out at my house to troubleshoot a disconnecting modem that happens everyday if the temp is below 15 degrees..   of course always night time when I'm on it..    He comes out and trys explaining my modem is the issue and showed me the graphing tool.   Because I owned my own modem they weren't going to do anything about the ingress signal unless I replaced my modem.   Little did he know that I am a tech too.  and the ingress signal was FAR below any of the communicating frequencies.  After calling him out on his bluff he got in his truck phoned his boss and left..  not even a bye, or a let me check, nothing....   just walked away....    after doing some troubleshooting myself and looking over the connections.  The previous tech that ran and burried the line cut the stingers too short resulting in stinger pull out..   loss of signal.   Explained issue to comcast.  they sent another tech.  I requested that they re-terminate the cable ends.   Of course its warmer during the day..  so. cought on security cam,   tech comes out.   climbs ladder.  pulls coax out plugs it into meter than back into block.   climbs back down.   stores ladder away.  no work done.   Called comcast again.   told them what I saw.  had a tech out the next couple of days.   came to the door and asked if it was ok to measure signals on the cable.    I had to stop him during his request.  and say.  No.   Your supposed to come out cut off the ends and reterminate properly.   He was trying to explain to me that, that doesn't happen much anymore and that he was only required to verify a good signal at the poll and house.   I could tell he really didn't want to replace them.  After giving him a history of who I had out, and what we already done,  he agreed.  Ok,  I will replace the ends for you.   Ever since then it's stayed on.

Moral of my long story is the majority of the public are not technicians,  and dealing with folks who dont have a clue to whats goin on for so long.  they tend to use excuses and blame game to point the finger elsewhere.   How would they know any different.  So I usually take anything a tech tells me with a grain of salt, cause if I had the truck keys, and access..  I'd just fix it myself.

Now dont take it as Im saying you don't know what your talking about, or belittling what your tech showed you...   The Node may very well be maxed out..   in which case they need to expand.   My original post btw I was thinking you were speaking of My Node. 

Man I miss my SB8200.   it banged off the Provisioned speed limiter like a 16yr old does his coffee can honda.

Welp its almost 1 am here.  as promised I probably wont stay up too much longer.

I still have ~950Mbps with the IPv6 enabled preffix /64

time will tell.  it wont last any more then overnight on prior IPv4 only.   I cant confirm this for sure because its too early to tell if I turn IPv6 off again.  it'll kill the theory that it works..  

Great story.

I had a similar issue with ATT U-Verse.  I had issues with them for months.  Had several techs out messing with my lines connections each blaming the last guy.  I finally had a supervisor come out and I showed him a sprectum analysis of the signal coming to the house.  He than discovered I'm a electronics engineer.  I switched to Comcast, now Xfinity, after that.  This was about 8 years ago.  We have 2 local AM radio stations that was interfering with the U-Verse signal.  The neighborhood is still twisted pair phone-line which acts like a big receiving antenna.  The U-Verse signal was operating in a bandwith that both radio stations were also in.  Albeit the U-Verse signal being much wider, but the AM radio stations stronger causing a complete drop in signal in two spots making the U-Verse signal all but unusable. 

So I can totally appreciate your story.  I run into this more often than I should  They do try to take advantage of you if they can.  I don't understand why people are so lazy anymore.   Than you find a few that are willing to go the extra mile.

I had an issue just a few months ago.  Best Buy didn't want to install the dishwaher we had ordered.  The guy came in the house and said it wouldn't fit after measuring it.  I told him you're not measuring behind the tile because the dishwasher doesn't sit on the tiles.  I get this song and dance about he's been doing this for years and he's a 100% positive it won't fit.  Than I ask to measure the new dishwaser and thusly proving it will fit.  He still refused to install it.  There's a lot more to the story than that, but let's just say Best Buy hired a sub-contractor to isntall it and it only took 2 minutes to put it in and another 10 or so minutes to hook up the water line.  Best part was the refunded the install fee for all the trouble.  I could have installed it myself, but that's not what we paid for and end the end didn't have to pay for it at all.

I don't understand techs these days.  And the amount of flat out lying that is taking place.  

Anyways, I hope you all get the problems fixed soon.  I hope mine stays fixed minus the node.  It's defintely an Xfinity issue.  I did share the IPv6 theory with a friend of mine as it's not the first time I read about it.  He will try to that as a fix, if it is indeed turned off on his router, this weekend.  His wife is working from home and cannot have service interupted.  My wife is in the same position.  

@Jbmeth007 how did you enable IPV6 settings on xfi router?

you dont.    if your using the modem in router mode.  everything works fine...   this is part of the problem..... investigating currently..   So far I've been solid from my last report.

While in bridge mode you don't have access to make any adjustments.  and IPv6 is on...   it doesn't make sense on my end but i have a hunch to whats going on..

its in bridge mode where youd have to make adjustments to your own routing equipment.

Still on the XB7 in bridge mode.  I had IPV6 turned and Hardware NAT turned off on my Amplifi HD.

The fastest I can get is about 917/42 late at night very early in the morning.  It's close to 6PM where I'm at.  Since my wife isn't working from home and no one in the house is on the internet besides me I thought I would experiment a little.

I ran some speed tests.  I got 879/24 and 893/28.  Figured it's prime tv streaming time.
I turned on IPV6.  The router did indeed grab an IPV6 address.  I got 800/36 and 799/34.

I turned on Hardware NAT.  I got 945/36 and 945/37.

I turned off IPV6.  I got 949/31 and 949/36.

I turned off Hardware NAT.  I got 844/42.

I turned Hardware NAT back on.  I got 948/38, 948/41, 953/38, 949/38, 947/31.

Looks like I need Hardware NAT on.  These are the fastest downloads I've ever got.

Sorry this didn't help with the IPV6 scenario, at least not for me.  I did tell my buddy about IPV6 and I'm still waiting for him to tell me his results or maybe he'll share them here.

I'm looking at replacing my Amplifi HD with a Unifi Dream Machine Pro and FlexHD AP's.

so your saying your currently sitting without IPV6 turned off, on your routing equipment..  it is currently set at IPV6 Disabled. and Hardware NAT on....

After tonights invasion *cough*. manifest report Data and device harvest.  Is when it would drop for me.  I always had Hardware offload enabled for everything.     I use an Ubiquiti USG3p at the moment.  soon upgrading to take advantage of the 2.5Gbase-T port. am also looking at UDM-pro.  unfortunately presales cant answer my basic questions, so I have to resort to thier forums,  which they never heard of a modem with 2.5GbE.   getting that into the WAN side SFP+ is looking to be costly and tricky.  A simple transciever doesn't work.   Need media converters at $170 a pop.   Also got a screenshot of the Wan SFP+ port manual negotiation rates.   only 1000FDX and 10Gbit.   nothing in between.

So far I am still solid at 948/42 24hrs a day...   doesn't really matter what time of day.   It could be the server your testing with as well.

If you do infact currently have your IPV6 disabled.  and xb7 in bridge mode.   Follow up with me in a couple days and see where your speedtests have gone.

I'm also having the same issues (pay for 1GBPS only getting 600) running the router in bridge mode. is it just better to just buy the 160 Surfboard modem and activate it with Comcast?

@Jbmeth007  do you have any contact emails for who you were working with in exec support?

I'm pretty sure if you buy your own modem, then you'll also have to pay $50 a month for unlimited data. I know I would.

My buddy got his new XB7 with much trouble from Xfinity trying to get it.  Lot's of okay we'll ship it and they never did.  After several days and several phone calls he finally got it hand delivered from a tech already provisioned.   It's working for him in router and bridge mode full speed.  He's had it for a few days now and he's had no issues.

Mine is also working well still.  Got my new equipment and have moved onto a new issue with chromecast not working even with MDNS on the new UDM Pro.  AirPlay is working, but not Chromecast.   Oh well... always something.

In the same boat here. Look at my chat from their support. It's no help what so ever.

It's a hardware/firmware problem. XB7 fixed my problems.