New problem solver
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17 Messages
Slow upload on static IPs
I've been trying to pin down the cause of some machines having slow internet upload speed and I seem to have tracked it down to static IPs. Machines that get NAT addresses straight from the modem have good upload speed but everything that is assigned a static IP, either routers or individual machines, ends up with slow upload speed of about 9 Mbs, NATed connections straight from the cable modem get about 35 Mbs upload.
If I reboot the modem/gateway the speed returns but only for a short while.
Anyone have a clue as to why this might be?
Accepted Solution
BeardedOne
New problem solver
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17 Messages
3 years ago
Well, if anyone's interested in the result... The tech was out and initially said it's not possible. The speed shouldn't depend on the IP and the tech I talked to on the phone didn't know what he was talking about. He initially connected his laptop to the modem and used DHCP for the IP and everything was fine. He said it was a configuration problem on my end.
He seemed ready to leave at that point but I explained about the static IPs having the problem and I insisted there was an issue. He then set up a static IP on his laptop, I gave him a free one to use. I guess that's not something he does very often. After it was setup he tried a speed test again and lo and behold, slow uploads!
For lack of any other ideas he gave me a new modem. The old one is less than 6 months old but maybe I wore it out. :)
Everything seems to be working again with the new modem, static IPs and all.
I'm not sure what was the "root problem" as they say in my business. Maybe it had something to do with the ICFR or maybe not. I'm just glad it's working properly again!
So, in the future if someone says the speed shouldn't depend on whether it's a dynamic or static IP you can you can tell them about the Bearded One and his particular issue. :)
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Comcast_Antoine
Official Employee
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35 Messages
3 years ago
Thank you for taking the time to reach out and being part of the Xfinity family. The upload speed isn't tied to dynamic or static Ips, you should be getting what you pay for no matter what kind of Ip you have. I'd be happy to take a look at your account to see if I can find a root cause for you. In order to get started can you please click the chat bubble in the top right corner and send a message to our "Comcast Business" handle?
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BeardedOne
New problem solver
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17 Messages
3 years ago
I don't see a chat bubble. When I set the machine to use DHCP everything is fine but if I set a static IP the upload speed will drop considerably after a while. It happens with Windows, Linux and routers. I'm a bit stumped myself. I've been doing this a long time and the setup hasn't changed recently. From my logs it appears to have started a few days ago.
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BeardedOne
New problem solver
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17 Messages
3 years ago
I found a chat bubble on the main screen but it says it is currently unavailable. I will call in to support tomorrow. I think I had enough of this for today.
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BeardedOne
New problem solver
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17 Messages
3 years ago
They are sending a technician out this afternoon. Apparently I have issues with ICFR errors on the transmission. They say the packets for a static IP are bigger than non static IPs due to the routing information. The bigger packets may have trouble sneaking through while the regular DHCP packets get through, usually.
That's the theory, We shall see if it holds up.
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smoats
New Contributor
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28 Messages
3 years ago
I have this problem EXACTLY. Had tech look at it to no avail. It appeared a few weeks ago.
Rebooting the modem makes it work properly for 10 minutes. This feels like a packet shapper.
Getting VERY VERY frustrated. Below shows the cap appearing.
(edited)
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user_d20806
New Contributor
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2 Messages
2 years ago
We have been having the exact same problem for months. I called Comcast several times. Opened many tickets. Waited for tier 2 to call back, just to find out the tickets were closed immediately after hanging up with support. We are an IT shop and our clients are also having the same exact problem, even after the modems are replaced. This is a wide-spread issue. Please add me to the list of people needing an answer.
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howdytrav
New Contributor
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2 Messages
2 years ago
I am currently suffering the worst Upstream issues I have ever encountered.
Upload speeds that go from 20Mbps to 0.08Mbps when under load on a Business Class service at a premium for over 10months, 5 modems, 10 technicians, 2 field service calls and help from Tier2 repair support since March
Texas Comcast management refuses to take ownership of the Problem.
The Problem is identified outside of the Office ... outside of closest pedestal, outside of closest node, and I can get no movement on getting a resolution to this service problem.
The service problem even presents itself when you remove the Office from the modem with all wifi off.
What needs to be done to get help with Quality of service issues when the Comcast Customer Service says we can help no further because upper management will not recognize this as a problem.
What needs to be done when the Comcast customer service rep suggest you contact the Better Business Bureau and the local Attorney General's office to get help with your problem.
"Core Values"
Comcast core values comprise “integrity, entrepreneurial spirit, respect, and giving back.” The culture of this company proves that it is a people-centered rather than a self-centered one. This is shown by the manner in which the company respects its customers and all stakeholders while delivering its services."
Where is the integrity in honoring the promise of reliable business class service and listening to your employees when they tell you the issue at a clients office is outside the office.
Comcast Where is your integrity to fix this?
12yr of loyalty to Business class service should count for something!
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user_94d364
New Contributor
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1 Message
2 years ago
We are experiencing the same upload speed problem that started this week. Upload speeds ranging from 0.00 to .07 Mbps. We run our systems on the cloud so this has hampered the entire office's productivity. If I could get it up to 3 or 4 Mbps, we'd be in heaven even though it should be much higher. How do we fix this issue?
Download speeds are not a problem.... ranges 80 - 250Mbps, just upload speed. PLEASE HELP!
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