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Help with a HP Procurve 1800-24 Switch

Occasional Visitor

Help with a HP Procurve 1800-24 Switch

 Good Morning Everyone

I'm getting a little confused and puzzled by this issue so i thought i would post on here and see what people have to say about it.

So i have a HP Procurve 1800-24 Series Switch, My Internet goes into my ISP Modem and then into my Router From there one cable goes from my Router to my Switch to link them together.

The Speed i pay for is 200MB Download and 20mb Upload and this is where the issues start.

So the few devices i have who are 100mb only devices are getting throttled to only 15mb Download and 20 Mb Upload but if i do a speed test on my devices that are gigabit i get 215mb Download and 20MB Upload exactly what i would expect.

I will leave some screenshots of the adapters and speedtest of each test.





So has you can see for some reason when using devices on the 100mb adapters the switch is only allowing around 14 - 15mbps Download and 20MBPS upload. also you can see when doing the same test on a 1GBPS adapter im getting more then my full switch.

Any Advice or guideance on this issue?



Honored Contributor

Re: Help with a HP Procurve 1800-24 Switch

First thing first: Mbps and MBps (M as in Mega, b as in bit and B as in Byte) are different units; mbps or mBps (m as in milli) practically don't exist (OK, they - as measuring units - sure exist but nobody will ever use milli bit per second or milli Byte per second as speed units).

So, once we agreed to speak the same language giving the words we use the same meanings, we can start to diagnose your issue.

I suppose you contracted 200Mbps/20Mbps of Download/Upload bandwidths with your ISP so:

(a) Is your Router connected to the 1820-24G through a Gigabit Ethernet link (1000Mbps=1Gbps) or what?

(b) Is any of your Fast Ethernet (100Mbps) devices using their NIC port in Auto Speed/Duplex mode or what?

(c) Are all your hosts (Fast/Gigabit Ethernet) connected the same way and with similar IP Addressing (Default Gateway, Subnet, VLAN, etc. is the same, I mean)?

In other terms Fast Ethernet and Gigabit Ethernet devices should auto negotiate theirs speed and duplex modes with the 1820-24G, supposing the Switch has ports all set to Auto with that regard. That to be sure there aren't Speed/Duplex mismatches between (some of) your devices and the Switch. Cabling is important too.

Then, speaking about test you did, when you test your ISP Download/Upload Speeds against a particular server (so testing is somewhat reproducible) you should test (from) a host at time since (1) a Gigabit Ethernet connected host can easily saturate the D/U ISP contracted bandwidths during each test run, thing that (2) a Fast Ethernet connected host can't (at least speaking specifically about the Download part of the test since 200Mbps are double that the Fast Ethernet maximum port speed).

Edit: another way to test good switching performance host-to-host within the same Switch is performing iperf/iperf3 tests (Client/Server) using hosts you have so you will be able to figure out if host-to-host (mixing Fast/Gigabit Ethernet ones) are able to saturate their link speed (respecting their type of NIC port characteristics). That way you will understand if the culprit is at Host, Switch or Router level.