Gigabit Service only providing ~250mbps down

Checking in with everyone here - shouldn't I be expecting higher speeds to my device?

Getting between 200-260 mbps down on speedtest. Only thought is that maybe my router is splitting it max per device? But that doesn't make sense because I've def got higher speeds in the past.

Docis 3.1 modem, connected on all 32 channels, great SNR, no errors - connected on a MBP on 5ghz, right next to the router with 800+mbps transmission rate - no one else online in the house at the moment. Tech setup the line last week, zero signal or connection issues.

UPDATE : Got a ethernet adapter to test my connection, got about 360mbps via ethernet, switched back to wifi real quick and got around 240 mbps. Ether way this is way lower than 1000mbps.

Responses

quindar7

Regular Visitor

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4 Messages

4 years ago

Same story here in Cypress, TX whereby the Gigabit service is capable of delivering 1Gbps, but it does so only in very specific scenarios.

For example, all traffic to Netflix and confirmed by speed tests using fast.com is throttled to 250Mbps. Additionally, traffic originated from Web browser user agents is limited to 250 to 350Mbps. Even Xfinity's speed test attempts to mask this by using two streams in the test, but still only reaches ~500Mbps. That said, commandline tests using "speedtest" or iPerf along with multiple streams can reach a satisfying 900Mbps.

Comparing the same tests with AT&T's Gigabit service, I find that regardless of the test used a consistent 900Mbps of throughput is achieved. AT&T does not have bias when it comes to user agent and destination. Consequently, I'm considerably disappointed in Comcast's network management practices, making their Gigabit service a 250Mbps service in practice.

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quindar7

Regular Visitor

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4 Messages

4 years ago

@rootsup were you able to get to the bottom of this at all? I'm curious if you could perform the following tests to help the community?

1. Connect a 1Gbps capable physical or virtual device running Ubuntu directly to your cable modem (ensure it receives a public IP via DHCP, you may need to reboot your modem).

2. Install the Speedtest CLI

sudo apt-get install gnupg1 apt-transport-https dirmngr -y
export INSTALL_KEY=379CE192D401AB61
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys $INSTALL_KEY
echo "deb https://ookla.bintray.com/debian generic main" | sudo tee  /etc/apt/sources.list.d/speedtest.list
sudo apt-get update
sudo apt-get install speedtest -y

3. Run speedtest from the CLI and report the results

   Speedtest by Ookla

     Server: Tachus Fiber Internet - The Woodlands, TX (id = 31012)
        ISP: Comcast Cable
    Latency:    19.96 ms   (4.06 ms jitter)
   Download:   940.06 Mbps (data used: 1.2 GB)
     Upload:    42.02 Mbps (data used: 45.9 MB)
Packet Loss:     0.0%
 Result URL: https://www.speedtest.net/result/c/45d34b63-2efc-4caf-be9f-b21ecfc51848

4. Install the Netflix Fast CLI

sudo apt-get install npm -y
sudo npm install --global fast-cli

5. Run fast -u from the CLI and report the results

     280 Mbps ↓ / 38 Mbps ↑

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rootsup

Gigabit Service only providing ~250mbps down

quindar7

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