Questions tagged [network-speed]

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LAN speed fluctuations

I am totally out of my depth here, but hopefully someone can at least tell me if what I am seeing is "normal" or not. I am in the process of migrating a VM from one ESXi host to another via ...
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Set two IP addresses for parallel data transfers

I need to transfer massive amounts of data to my server from different client systems around the world as fast as possible. My organisation has two redundant lines from different service providers (...
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Will cars arrive to 2nd booth before all cars serviced at first booth?

Suppose cars now “propagate” at 1000 km/hr and suppose toll booth now takes one min to service a car. It's also given each booth is 100 Km apart from previous booth (taken from Computer Networking: A ...
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Why do the creators of this dashboard multiply bytes by 8 to get bits? Isn't it the other way around?

To monitor a server we have imported a dashboard for Grafana. This uses Telegraf and InfluxDB as collector and database. When certain graphs needed to be adjusted, I noticed that in the network speed ...
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2 votes
1 answer
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SSH keys: ed25519 vs RSA performance demystified

It is claimed that ed25519 keys are better than RSA, in terms of security and performance. In terms of security, I understand that 4096 bits RSA keys are practically unbreakable for the foreseable ...
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1 answer
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something is "blocking" my images from loading faster tried apache configs, nginx, cache header stuff, nothing changes

THE ISSUE : the images in my site takes a bit to start loading... like if something is blocking, but unable to pinpoint what could be the cause. PHP 8 / latest WHM LIVE EXAMPLE : https://www.stubfeed....
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4 votes
4 answers
2k views

Why do some VPN clients slow down the network connection even when they are not it use?

I work as an I.T. consultant, and I often have to install various VPN clients on my computer in order to connect to customer's networks; beginning in March 2020, I started always working from home for ...
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2 answers
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Is it possible to have high internet speed with low bandwidth?

I just came to understand that the bandwidth is just the difference between the highest and the lowest frequency of transmission. And i also have and understanding that higher the frequency ==> ...
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I live in Australia, how is it that Stack Exchange is so fast without using any CDN?

I had a look at the Stack Exchange Servers: https://meta.stackexchange.com/questions/10369/which-tools-and-technologies-are-used-to-build-the-stack-exchange-network Seems they only have two data ...
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3 answers
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Internet speed required to use Microsoft Teams from Japan to the USA [closed]

I really hope this is the right place to ask (this is my first question here so please go easy). I have a great opportunity to go to work remotely (HR signed off on it) from Japan. I have a place to ...
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1gb vs 10gb uplink in terms of TTFB

I am about to setup a new dedicated server, I have the option of 1gb vs 10gb uplink with a considerable price difference. I do only have 10 domains on this sever and traffic is not huge. However, on ...
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3 answers
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Accelerate loading time in others countries by installing some kind of VPN? (What is it called?) [closed]

My servers are hosted in France (OVH) and my users are mainly from France. I am starting to have more and more users in Asia and North America, but some of them have huge speed problems : more than 3-...
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Are we still limited by TCP Window Size when we want to fully utilize bandwidth from far away servers? [closed]

According to this website, as soon as round-trip time is increased, we lose a bit of our real-time capacity throughput to distant servers using default TCP Window size of 64KB. My network bandwidth is ...
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1 vote
1 answer
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Self Hosted Speedtest Command Line Script

I would like to write my own local speedtest script with a server script for listening to connections. To try and not duplicate my efforts, I haven't found much while searching. I can find lots of ...
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2 answers
4k views

Slow network speed on ESXi hosts

I have been dealing with this problem for about half a year (had the luxury of time) and hadn't managed to crack it, so I finally resigned and came over here to ask for help from others not just ...
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i want to visualize myself about bandwidth of internet [closed]

as we know bandwidth is just a way through which data flows.20 Mbps internet means 20 mega bits per second and 40 Mbps means 40 mega bits per second.i guess 20 Mbps means 20 Mb of data is retrieved in ...
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What's the direction of speedtest download/upload? [closed]

What's the direction of download and upload in speedtest? The Server is Hong Kong STC, my local is: 12.34.156.228. When I test the speed, you can see the DOWNLOAD 28.38Mbps and UPLOAD 22.77Mbps. I ...
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Windows reporting 1Gbps but file transfer speed only 100Mbps

Things I checked: Windows adapter status confirms 1 Gbps connection on both PCs Removed other PCs connected to the network Both PCs are connected to TP-Link Archer A6 Isolated HDD speed by using ...
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openvpn clustering and throttle network speed

I am currently using Ubuntu for an OpenVPN server and it is working well. Each connected device can get an IP Address from the DHCP provided by the OpenVPN server. But for our project, is there a way ...
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1 vote
1 answer
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Why is there a difference in speed of forward and reverse traffic over 10 G network in iperf tool

I have a 10G network setup between my two servers (say, Server1 and Server2) and I'm using iperf tool to measure the bandwidth of the network. Here are test cases that I performed, Test Case 1: (...
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1 vote
1 answer
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Why is upload way faster and more alternating in speed than download on local machine

I am writing a speed test to determine browser-server connection speed (js+php but I don't think it matters). I send a bunch of data-packages in different sizes and measure the time they need to reach ...
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1 answer
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What does a "Blended IP" mean in terms of speed?

I'm getting a server colocated at a facility and they stated the internet speed will be 10 Mbps Blended IP on 100 Mbps Network Port. What does blended IP mean?
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2 votes
1 answer
1k views

socat tun device very low throughput

I was tinkering around with socat and tried to use socat for creating a TUN device for tunneling between two debian stretch servers. However, throughput seemed very low and comparing with iperf ...
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1 answer
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Why do my P.L.Cs (Power line converters) devide the speed by two?

If I directly connect to my 100MB router with a CAT.5e cable, I get these results : $ speedtest --simple Ping: 8.617 ms Download: 92.54 Mbit/s Upload: 93.90 Mbit/s $ ethtool eth0 Settings for eth0: ...
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Network share slow down over time

We have a Mac mini 2018 which share the content of a Raid NAS and after like 6-7 days the read/write speed of the connected user drop down, what would be a good way to investigate what is the problem ?...
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569 views

Slow file transfer speed untill network service restart in CentOS

I have a Windows Server VM which connects to my Storage VMs running CentOS in another Data Centre over SFTP and FTP. The uplink between the servers are all 10Gbps and more and both VMs are ESXi ...
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19 votes
6 answers
12k views

Why the discrepancy between Speedtest and Wget?

My customer complains about low internet speeds. When measured with Speedtest.net speeds are acceptable. Periodic measured downloads are 10% to 30% of the nominal speed. I cannot explain that. Some ...
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979 views

OpenVPN Connection very slow. Server located in Hong Kong, and Client Desktop is in New York

I have a OpenVPN vps server in Hong Kong. The specs is just 1 Core 2.2ghz CPU and 1GB of RAM. The connection is a 100mbit. But when I connect from my desktop in NY, my speed is only 1-2mbit only. I'm ...
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-2 votes
1 answer
28 views

Whether the Speed Auto can have a network speed reach to the switchport top?

My Juniper EX4300 Switch ge-0/0/42 switchport configuration is bellow: admin@1409A# run show interfaces ge-0/0/42 Physical interface: ge-0/0/42, Enabled, ...
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1 vote
0 answers
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What factor impact network speed between VM significantly?

There is question about network between different server,but i got a different situation. I have two VM in a server,and I tried to test maximum network speed between two VM. OS : CentOS VSwitch ...
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Server Promoted to Domain Controller causes high ping times

We have recently (couple of months) been having issues with our internet, after dealing with our provider who states it is not their issue yet my boss and owner of the company is certain it is ...
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1 answer
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Bandwidth to hosts abroad [duplicate]

I have a server with 1 Gbps uplink. Testing gives me a download/upload speed of approx 600 Mbps to servers nearby in Europe, and 100 Mbps to servers in US. I want to host a server and I need to know ...
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1 answer
290 views

Transfer speed to network share drops

I have an older HP Proliant ML350 G6 server with 1 x Xeon E5504 (2.0 ghz) and 8 gb ram. If I copy a large file (over 2 gb) to it from a windows 10 workstation, after about 1.5 gb the transfer speed ...
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1 vote
1 answer
52 views

Building reliable internet speed test tools

I'm interested in building a command-line speed test tool similar to the one used here. I started using it in a cron job to automatically check and record speeds at different times when we started ...
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1 vote
1 answer
41 views

Cheapest solution to monitor gigabit internet connection performance [closed]

I want to perform speedtest-cli performance tests of the internet connection of a fibre connection which is advertised to 1Gbps at regular intervals, say every hour, for one year. I have been looking ...
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1 vote
0 answers
16 views

Real World Speed Test via public Web Pages

Warning: I know up front that this is a question asking both for resources and opinions. Ideally, feedback/answers could address the spirit of the question, rather than shout it down. By spirit of the ...
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2 votes
2 answers
811 views

DRBD weird speed dips

couple of weeks ago I made a test setup for DRBD on couple of servers. The speed was fixed 90MB/800Mb as per my config for initial sync. Now I have reinstalled the OS (CentOS 7.4) to do final install ...
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What factors affect the speed of a VPN connection?

What hardware/software factors affect the speed of a VPN connection between two computers (1 Gbps network cards) on a lan with just a 1 Gbps switch between them ? More vague : Is it possible to ...
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4 votes
0 answers
217 views

Not sure I really get 10 Gbit between our servers on the 10 Gbit network

We have a 3 Unix (1 Ubuntu 2 Redhat) servers connected via their 10 Gbit network cards to a 10 Gbit switch (our IT person made sure we got the correct cables). We experience some odd behaviour when ...
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8 votes
2 answers
2k views

What type of hardware is required for a Gigabit connection?

Just in case the question I am asking is unclear or hard to understand, I am basically asking whether or not the type of hardware in a machine (such as a router or server) matters when using a gigabit ...
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1 vote
0 answers
113 views

Fibre Optic port moving to 1000Mb/s eventhough it is not in the supported link mode

In my Fibre Optic device (Linux 2.6.27, LXT971A PHY Transceiver), connection to the port is lost intermittently. While debugging with ETHtool, the following observation was observed: Settings for ...
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539 views

Same ethernet cards, same firmware, same drivers ... different Advertising Mode

I have a strange issue. Having same cards, same drivers and same updated version of ethtool on 2 different OS, (XenServer7.* and centOS7.3). if I run on centOS ethtool on the card I get: Supported ...
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0 votes
2 answers
2k views

What's the operation about iperf udp

I'm trying to doing some bandwidth test by run iperf on my device, My Network Max Bandwith is 100 Mbps (test by speed test CLI - https://github.com/sivel/speedtest-cli) And I ran the iperf UDP ...
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1 vote
1 answer
268 views

How to prioritize my network traffic in Azure?

I created two VMs on Azure, one at Australia East and the other at Brazil South. The two VMs are of classic model and run Ubuntu 16.04. I created endpoints on these VMs and ran a server-client program ...
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How do I send all traffic generated by a command through a specific interface? Or, speed test for specific interface?

I am writing a script that basically scans OpenVPN servers using the openvpn client. By scanning I mean it checks whether if the server is accepting connections or not by attempting a connection, ping ...
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1 vote
2 answers
2k views

Bandwidth vs Uplink Port Speed

If a dedicated server has - 1. 1Gbps uplink port speed 2. 1Mbps unmetered bandwidth Under what circumstances will bandwidth be a limiting factor for serving requests and under what circumstances ...
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inconsistent speeds from different services. Mainly speedtest.net

I have had a few dedicated servers from online.net and they have all been great. But recently I have found issues with my connections on my new server. It is a Dedibox MD SSD 2015 Gen2 (Ubuntu 16.04)....
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2 answers
955 views

What's the caculation for network speed reported with sar-n DEV output?

I am confused about the network speed outputs: If the report says: sar -n DEV 1 1 Linux 2.6.18-194.el5PAE (dev-db) 03/26/2011 _i686_ (8 CPU) 01:11:13 PM IFACE rxpck/s txpck/s ...
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Outbound requests from PHP 7 (but not PHP 5) are very slow

I have both PHP 7.0 and PHP 5.6 installed on my server (it's a dedicated server with plenty of resources), and outbound requests are very slow when made through PHP 7, but not when made through PHP 5. ...
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1 vote
2 answers
2k views

Cisco Router or Switch Limiting Internet Speed (Huge Slowdown)

I work in a very small office where we have approximately 5 office desktops wired to the internet through what appears to be CAT5 mixed with CAT5e wiring. The wires flow in this order: Desktops > ...
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