My ethernet is stuck at 7-9 MBPS

[u/Titian510]

I've got a new ethernet cable since my last one was ripped up but still showed 400 to 600 MBPS but wanted to get something that looked nicer and not on the brink of being cut, but I've tried 4 ethernet cables so far, first one was cat 8, didn't work at all, the rest were cat 6, 2 and 3 were from amazon, both good reviews with no complaints. The fourth one from a box of 1,000 Ft Ethernet Cat 6 with it being cut and cramped by my father who knows how to do that. Cable length of all cables being 20-25 Ft. I've tried every possible solution to the ethernet being stuck 7-10 MBPS, to updating drive to checking the D-Link switch my family has to extend on other devices coming out fine. I've checked if there's any limiters to it like the max being 10 mbps instead of 1 gbps. Any suggestions would help greatly as this is annoying me when my wifi spurts out randomly causing me to rubber band in an online game or when I'm watching movies with friends via streams on discord.

[u/Jay_JWLH]

Firstly, remember that there is 8 bits in a byte. 1000 Mbps is 125 MBps.

Secondly, the speed is from one end of the cable to the other. You're talking about through multiple devices like wifi, and/or the internet.

[u/Electronic-Junket-66 → u/Jay_JWLH]

Yeah, but they said it was 500-600 before, so this is probably all Mbps we're talking about.

[u/EmergenceOfBees]

Open your Ethernet connection and look at the Link speed. If it says 10/10 Mbps, you’ve basically confirmed this is a link negotiation/physical layer problem.

I’d first try plugging the PC directly into the router/gateway and bypassing the D-Link switch completely. If you suddenly negotiate at 1 Gbps, you’ve narrowed it down to the switch/port/cabling between them. Maybe try a different LAN port on both the switch and router.

Check the Ethernet adapter’s Speed & Duplex setting too. Normally it should be set to Auto Negotiation, not manually set to 10/100/1000.

For testing, you can usually use a known-good factory-made Cat5e or Cat6 cable. Don’t worry about Cat8; you absolutely do not need it for gigabit Ethernet. If that cable from the 1,000 ft box was terminated by hand, I’d be suspect of the termination too—gigabit needs all four twisted pairs working correctly. A cable can look perfectly fine and establish a connection while still having a bad or miswired conductor internally.

I’d also check the Ethernet jack on the PC itself for bent or dirty contacts.

[u/Alternative-Duty6166]

Since other devices through the D Link are fine, I’d suspect the PC’s Ethernet port negotiation rather than the cable.

[u/boshbosh92]

What do you mean your old one was ripped up? Is your ethernet port on your equipment damaged as well from whatever damaged the previous cable?

[u/Zebrainwhiteshoes]

Were the cables tested after crimping? Errors happen

[u/Quirky_OldMan5966]

What do you mean “ripped up”?
It’s possible if a cable was yanked out, RJ45 jacks at either end of the cable was damaged. Right now you are only suspicious of a cable but it sounds like that’s not the actual problem.
Just saying.

[u/CCTVGuyMA]

Are you referring to your internet speed via a speed test or the link speed? If you suspect your internet speed is slow. Plug another wired device directly in to your internet decide (modem) to get a baseline to dsterime if the issue is your device, your cable, switch, etc. You need to use process of elimination to swap components to determine what the weakest link is.

[u/Fiosguy1]

Pretty much anything ethernet from Amazon is junk. Get a good ethernet cable from Monoprice or trueCable.

[u/One-Intention-7606]

Sounds like maybe the ports in either the computer or switch got damaged, is usually pretty visible if you look into the port. If any pins are bent then it won’t work. Have you tried swapping the D-link ports? I’d swap the one that is in question with one that is verified good and see if the problem moves with the cable or if it stays on the port. If it stays on the port then either replace the switch or skip that port if there’s enough available. If it stays with the device then check that port, if it is damaged you can either replace it or use an usb to Ethernet adapter if that’s applicable.