Having strange network problem, please help.

[DBgenerations]

So starting a couple months ago every weekend my internet would just go to complete crap, and i just dealt with it because it was easier than dealing with xfinity customer support. But now its happening almost every day and for the life of me cant figure out what exactly the issue is. Can someone help me figure out whats causing this issue?

What its doing:

Takes forever to fully connect to a site, if it ever connects. It will sit on connecting in the browser for a long time and sometimes never connects, but when it does connect it acts 100% normal, for instance; I can keep hitting refresh until it finally connects to netflix, once im on netflix i can browse and watch movies non stop with no issues, but if i open another tab and try to even go to google it hangs or times out meanwhile my netflix tab can still be working just fine. I initially thought maybe it was the DNS so I manually changed to Cloudflare and then tried Google dns but they all did the same thing.

Then to add to the weirdness of the situation, if i run an OpenVPN server i can do everything just fine with no connecting issues at all.

So does anyone possibly know what is going on here? I'm betting its an xfinity side thing but i need to figure this out.

Oh also I've tested on 3 different modems and its still giving me the same issues.

Thanks

[Endeavor01]

Ye I'd say it's an Xfinity problem, if it's the same deal on multiple machines then definitely is.

If you connect to say Netflix after a couple of attempts and then you refresh the page does it reconnect right away or does it recreate the problem?

Seems like comcast either messed up their static routes or there's some TLS problem.

[sphbecker]

When you said "if I run an OpenVPN server..." what do you mean exactly? Are you connected to a VPN provider?

 

If everything works correctly over VPN but not directly, then it could be any number of issues. If you see the problem on multiple devices, then you know it isn't a computer issue. Here are a few things it could be...

QoS or game accelerate working against you (try turning completely off and retest)

Advanced security on computer or router (not basic firewall)

Bandwidth saturated (try running speedtest.net with nothing else running and make sure you are getting the speed you expect)

Overly crowded WiFi channel

MTU set too high (1500 should work fine with xfinity, if it doesn't, I would report an issue)

 

Try this as a test...

Open two different command prompt windows and start these two pings, let them run

>  ping 75.75.75.75 -t

>  ping 75.75.75.75 -l 1400 -t

 then start Netflix and try to reproduce the problem. The ping times should not change much, if they do, or you see timeouts, then you don't have enough bandwidth for what you are doing. That could either be a QoS or ISP issue.

 

[Donut417]

On 1/22/2019 at 7:04 PM, DBgenerations said:

So starting a couple months ago every weekend my internet would just go to complete crap, and i just dealt with it because it was easier than dealing with xfinity customer support. But now its happening almost every day and for the life of me cant figure out what exactly the issue is. Can someone help me figure out whats causing this issue?

What its doing:

Takes forever to fully connect to a site, if it ever connects. It will sit on connecting in the browser for a long time and sometimes never connects, but when it does connect it acts 100% normal, for instance; I can keep hitting refresh until it finally connects to netflix, once im on netflix i can browse and watch movies non stop with no issues, but if i open another tab and try to even go to google it hangs or times out meanwhile my netflix tab can still be working just fine. I initially thought maybe it was the DNS so I manually changed to Cloudflare and then tried Google dns but they all did the same thing.

Then to add to the weirdness of the situation, if i run an OpenVPN server i can do everything just fine with no connecting issues at all.

So does anyone possibly know what is going on here? I'm betting its an xfinity side thing but i need to figure this out.

Oh also I've tested on 3 different modems and its still giving me the same issues.

Thanks

 Sounds like a routing problem on your section of the Comcast network. Because as it stands Comcast extorted Netflix for a boat load of cash and a result of that was Netflix has direct peering in to the Comcast network, meaning it should work great. Im on Comcast myself and Netflix, Hulu, Youtube all work fine on my end. So Id say its probably a local issue. This could be a result of them performing maintenance or upgrades in the given area, they are upgrade all areas to Docsis 3.1 as a result they are going to node+0. 

[DBgenerations]

On 1/24/2019 at 3:59 PM, sphbecker said:

When you said "if I run an OpenVPN server..." what do you mean exactly? Are you connected to a VPN provider?

 

If everything works correctly over VPN but not directly, then it could be any number of issues. If you see the problem on multiple devices, then you know it isn't a computer issue. Here are a few things it could be...

QoS or game accelerate working against you (try turning completely off and retest)

Advanced security on computer or router (not basic firewall)

Bandwidth saturated (try running speedtest.net with nothing else running and make sure you are getting the speed you expect)

Overly crowded WiFi channel

MTU set too high (1500 should work fine with xfinity, if it doesn't, I would report an issue)

 

Try this as a test...

Open two different command prompt windows and start these two pings, let them run

>  ping 75.75.75.75 -t

>  ping 75.75.75.75 -l 1400 -t

 then start Netflix and try to reproduce the problem. The ping times should not change much, if they do, or you see timeouts, then you don't have enough bandwidth for what you are doing. That could either be a QoS or ISP issue.

I ran the pings and they never changed while still experiencing the problem. Ive tried multiple modems and routers, still randomly experiencing this, at least once a day. just wish i could figure out what the problem is and fix it.

[Alex Atkin UK]

You didn't answer the OpenVPN question though.

[wanderingfool2]

23 hours ago, DBgenerations said:

I ran the pings and they never changed while still experiencing the problem. Ive tried multiple modems and routers, still randomly experiencing this, at least once a day. just wish i could figure out what the problem is and fix it.

Multiple modems and routers, so I am assuming you are experiencing issues on multiple PC's/devices as well?  (Sorry, have to ask).

 

If you have multiple devices plugged in, try going down to only one device.  I say this because I have seen devices bring down networks in a home.  Same goes for if you have a network switch, I've seen those things fail before.