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I spent ~$35 on new cables and my LAN speed increased 6x (self.selfhosted)

submitted 4 months ago by anonymouse2 to c/[email protected]

69 comments fedilink hide all child comments

After seeing that my wireless speeds were much faster than the speeds I was getting over Ethernet, I decided to invest in some new cables. I didn't know it before, but I saw while I was changing them out that my current cables were Cat 5e. While putting my network together, I had just been grabbing whatever cables I could find in my scrap drawers. Now I have Cat 8 cables and my speeds jumped from 7MB/s to an average of over 40MB/s. It's a much bigger improvement than I expected, especially for such a small investment.

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[–] [email protected] 36 points 4 months ago (1 children)

Cat5e works fine for gigabit. If it's not connecting at 1G, then the cable has been damaged and is probably connecting at 100M.

You should be seeing about 118MB/s in an iperf test on gigabit ethernet.

[–] [email protected] 4 points 4 months ago (1 children)

This. I've had issues at work while imaging classroom computers where some would finish in ~30 minutes and a few would need hours. All of the computers used Cat6 cables. This being a classroom, and students being absolute wankbags, they kept yanking the computers and kicking the cables, so the wires came loose from the plugs. I later used ethtool to debug the slow computers -- the switch would only allow 10baseT link modes.

[–] [email protected] 3 points 4 months ago (1 children)

For later reference, the link light on most network cards is a different colour depending on link speed. Usually orange for 1G, green for 100M and off for 10M (with data light still blinking).

[–] [email protected] 1 points 4 months ago (2 children)

But that depends on the card. And some gigabit devices won't do 10Mb at all.

[–] [email protected] 1 points 4 months ago

We upgraded our network and had old as shit devices that now need a dumb switch hooked into our $80k or whatever cisco switches because they can't do 10Mb lol

[–] [email protected] 1 points 4 months ago* (last edited 4 months ago)

True. Hence my caveat of "most cards". If it's got LEDs on the port, it's quite likely to signal which speed it is at with those LEDs.

I haven't yet come across a gigabit card that won't do 10Mbit (edit: switches are a different matter) but sometimes I've come across cards that fail to negotiate speeds correctly, eg trying for gigabit when they only actually have a 4 wire connection that can support 100Mbit. Forcing the card to the "correct" speed makes them work.