r/techsupport Aug 09 '22

Not getting the download speeds I should be Open | Networking

I pay for gigabit internet (900 down) but am only Getting 300-400 mbps wired directly to the gateway. I have two personal computers and two different USB gigabit Ethernet adapters. All hardware combinations are getting less than 400 wired. I know Ethernet adapters can be iffy, but these same adapters and computers were able to hit 900+ download two months ago on a different network with my old ISP (I just moved). A technician from xfinity just came out and tested my speeds and said they are providing gigabit speeds and there is nothing more that can be done on their end (he plugged my gateway directly into a device they have to test speeds).

Any suggestions? Is there something in my network settings on my computer I can look into resetting? Is there additional hardware I can try? Any help is appreciated.

3 Upvotes

3

u/MrGeekman Aug 09 '22

Do you own your modem or are you renting a router/modem combo from your ISP?

1

u/[deleted] Aug 09 '22

[deleted]

1

u/MrGeekman Aug 09 '22

How old are your Ethernet cables?

1

u/iMac_12 Aug 09 '22

I’m have the gateway from the ISP, it is a modem and router in one. The guy tested the Ethernet cable from the gateway I have into his device and it was reading gig speeds but my computers are not getting the same speeds. This equipment is less than a month old since I just started service with them.

1

u/MrGeekman Aug 09 '22

That’s very interesting. Have you tried disconnecting and reconnecting the coaxial cable? Sometimes it helps. I’m totally serious.

1

u/iMac_12 Aug 09 '22

Yeah because I had to move the gateway from one cable port to another and then back (the technician enabled a bedroom port so that I don’t need to keep the gateway in my living room). So this involved taking the coaxial cable off several times

1

u/iMac_12 Aug 09 '22

I still don’t get how even if a coaxial or Ethernet cable was the issue the technician could be reading gigabit speeds while I get half of that using the exact same hardware/cords.

1

u/iMac_12 Aug 09 '22

He mentioned in may need to reset network adapter settings on my computer. Do you know anything about that?

1

u/MrGeekman Aug 09 '22

Sounds like he’s just buying time.

1

u/iMac_12 Aug 09 '22

Right, but I saw that my speeds are gigabit when they test them so I don’t think he’s trying to mislead me

1

u/MrGeekman Aug 09 '22

Oh, okay. I’d look into the coaxial cable first. Sometimes they aren’t quite making contact. Even a quarter of a centimeter can make a difference.

1

u/iMac_12 Aug 09 '22

So the technician and i checked all of that type of hardware stuff. Again, the exact Ethernet cable (from my own router/modem) was reading 1000 on their end that I was plugging into my computer. I took it directly out of my computer and plugged it into his modem that he used to test, and it read two completely different speeds.

1

u/MrGeekman Aug 09 '22

Wait....he used a different modem?!

1

u/iMac_12 Aug 09 '22

No, my modem/router is plugged into the wall. I connected my computer to it with an Ethernet cable. I took out this same Ethernet cable and plugged it into a modem he had that was used to test speed. It was a device the size of a shoebox he said was used to test speeds from my modem. So basically my own modem was connected a device the technician brought that he also referred to as a modem

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u/MrGeekman Aug 09 '22

I think we may have identified the problem.

1

u/iMac_12 Aug 09 '22

He was just using that device to test wired speeds in place of another computer

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u/iMac_12 Aug 09 '22

Less than a year old. They are mediabridge cat5e. I got 900+ download on the same cable two months ago on another network. The technician also used this cable to test my speeds

1

u/MrGeekman Aug 09 '22

That’s very interesting. Cat5e is an old spec, but it should definitely be able to do gigabit.

1

u/iMac_12 Aug 09 '22

Yeah :/

1

u/TheDialupNinja Aug 09 '22

how long is the cable? cat5e can only do 1g up to a certain distance

1

u/iMac_12 Aug 09 '22

Less than 10 ft

1

u/TheDialupNinja Aug 09 '22

odd. Should be fine then

2

u/skrffmcgrff21 Aug 09 '22

Oh dude, they are capping your shit. XFinity is the WORST for this. When they consider a "high traffic" time, they will cap data and transfer speeds to help alleviate strain on the network. I dropped them for this exact reason. Fucking data capping bullshit, which is different from what you're saying, but the throttling is also a known tactic. When you are close to your data limits, they will also lower your speeds. Or like some plans allow for that gigabit speed for up to X amount of data and then it drops but it won't tell you this anywhere.

1

u/iMac_12 Aug 09 '22

Yeah I know what you mean. My only other ISP option only had 50mbps as an option so had to get xfinity. I specifically purchased a plan with no data limits for this reason. I have consistently clocked over 900mbps since earlier today, so I am hoping my speeds are more consistent now

2

u/jesseinsf Aug 10 '22

If you are using cable internet, then you want the latest DOCSIS 3.1 modem or gateway. Comcast is notorious at giving crappy equipment, so you may want to exchange it for a well-known good gateway/router. Or buy one that supports gig speeds.

1

u/ddog6900 Aug 09 '22

Where are you testing your dl speed?

It could be your router configuration if you have an external router connected to the gateway.

1

u/iMac_12 Aug 09 '22

So there is no router connected to the gateway. I have my computer plugged directly into the router/modem combination that was given to me by the ISP directly.

1

u/ddog6900 Aug 09 '22

So then the only other variable is where you are testing your dl speed. If you are measuring to a specific sever, try a different one, like xFinity. It could also be your network adapter limiting you or their gateway settings.

2

u/iMac_12 Aug 09 '22

How would I change my network adapter settings?

2

u/ddog6900 Aug 09 '22

Networks are complex, it is not a one size fits all.

I can’t tell you exactly what to do, besides you haven’t provided much information about your network setup, other than being connected directly to the gateway.

1

u/iMac_12 Aug 09 '22

If there is other information about my network that would be useful to troubleshoot this just let me know

1

u/ddog6900 Aug 09 '22

I mentioned twice already, I need to know what server you are using to measure your speed. Because you are not measuring your speed effectively, you are measuring your speed to that server. I would suggest trying another server, like XFinity and posting the results.

You may be getting effective speed, but getting throttled due to congestion.

That is something you can’t fix.

1

u/iMac_12 Aug 09 '22

I’m now getting 900 download when I do a speedtest and I do not know how lol. I did not change the server on the speedtest or anything else. I have not experienced this speed at all since installing my internet a month ago

2

u/ddog6900 Aug 09 '22

Again, network congestion. Peak times will slow you down.

Seems like your issue is resolved.

1

u/iMac_12 Aug 09 '22

Right, but “network congestion” does not explain getting 300-400 download when testing the speed at different times daily for a month and then testing at 900.

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u/iMac_12 Aug 09 '22

Okay, I am thinking I need to try to adjust my mtu size

1

u/ddog6900 Aug 09 '22

To increase dl speed, not likely.

MTU is maximum transmission unit, it is the packet size of the network device.

Changing your MTU may fix your ping/latency but not dl speed.

1

u/Timmy3xK Aug 09 '22

After reading through the comments... food for thought.

Are you using the same speed test site as the tech? I know for a fact some ISPs use an internal speed test site vs a public facing speed test site. If you are hitting a public site, and they are using an internal site.... You will probably get different results.

1

u/iMac_12 Aug 09 '22

Yes very true. I have used ookla and comcast’s site and usually get similar results. I also frequently change the test server when running from ookla

1

u/comport2 Aug 09 '22

You mentioned USB Ethernet adapters.. Even though the eth might be up at 1g, usb2 only has throughput of about 480Mbs max, so watch which jack you plug it in to.

1

u/iMac_12 Aug 09 '22

Right, I make sure the adapter is plugged into usb 3.0 on my PC

1

u/Ms_misfire Aug 09 '22

Call your ISP and see if they are throttling your speeds or check to see if your router has any unnecessary firewalls and is in bridge mode

1

u/cantthinkofanythingZ Aug 09 '22

The usb adapter might be the problem. Did you get 900 on that before?

1

u/iMac_12 Aug 09 '22

Yes, I got 900 on it two months ago on my old network at my old apartment. I am clocking 900 on it now too as of a few hours ago. Older USB adapters suck, but I have used gigabit adapters for a few years now with no issues (my PC's ethernet port no longer works).

1

u/cantthinkofanythingZ Aug 09 '22

What are you currently using to measure your speeds?

1

u/solus_tenebris Aug 10 '22

You might want to check the contract - does it mention that the speed they offer is within an interval? As in, min: 400mbps, max: 1gbps. If this is the case and they offer a speed higher than the minimum mentioned, there is no breach of contract.

Or maybe they cap the speed when there is high traffic. Might be worth a check. Good luck.