In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it (kilobits/s, megabits/s etc.).

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How to analyze bytes transferred over a group of servers?

We have around 50 virtual machines. I installed collectd, graphite and grafana and we have some traffic statistics like these: That produces a graph like this: The lines are incoming and outgoing ...
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24 views

Calculation of Xeon server memory bandwidth

I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz The configuration looks like this. 4 memory channels per socket DIMMs are 8x32 GB DDR4 2133/1866 modules ...
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42 views

Does RAM consumption use Network Bandwidth?

I have created a software which is being accessed by remote users through RDP (Remote Desktop Protocol). Application Platform : C# 3.5 - Windows Form Current Server that i am using : Windows Server ...
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28 views

Access database using Public External IP - Bandwidth

In an amazon EC2 instance, we pay for each GB of data transfer in/out. Which means, when are sent to server, it's data transfer in. When a user access some website hosted there, data is being ...
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28 views

How does a router without QoS decide bandwidth distribution?

I've been searching for this and from what little I've found modern day routers try to balance internet bandwidth as fairly as possible. (I'm using a Asus AC66U myself) For example, if I have a 100 ...
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How reliable is /sys/class/net/eth0/statistics/rx_bytes for bandwidth statistics?

I found this script at https://github.com/Cosmologist/collectd-network-bandwidth-usage. <Plugin exec> Exec user "/tmp/exec-network-bandwidth-usage.sh" "eth0" </Plugin> It runs a ...
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1answer
21 views

How to choose AWS EC2 instance with highest bandwidth for downloads?

I am about to create a new Ubuntu Server EC2 instance. However, there appears to be very little information regarding the bandwidth available for each instance type. The server will be primarily used ...
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24 views

TC not classifying packets correctly based on iptables MARK

I have machineA that is connected to the internet via eth0. MachineB on the other hand is connected to machineA through a mesh and is connected to the internet via machineA. I am trying to give lower ...
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1answer
88 views

Automatically Call a Script when a New User Connects and Bandwidth Shape the Connection

I hope this is easy The following script called up.sh works perfect when I run it from the command line as root. However, instead of manually calling this script each time a new user connects to ...
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38 views

pfsense inter vlan slow speed

In our company we use pfsesne 2.3 as a router. Problem is with inter-vlan transfer, which is very slow about 150kbit/s in both ways. Its very strange , network is 1GB , transfers inside vlan's are god ...
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64 views

Bash Script Not Working

I hope this is an easy answer Problems: I placed the following bash script called learn-address.sh in the following folder: vi /etc/openvpn/netem/learn-address.sh Added the following (2) ...
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1answer
138 views

How to do traffic shaping (rate limiting) with TC per OpenVPN client

This question is related to another question with a great answer and script from @Oliver. The goal: I want to modify/extend the script provided in this answer to suit my requirements, which are as ...
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1answer
131 views

Tune windows for high latency/high bandwidth tcp transfers

How can I speed up my Windows 7 tcp file transfers over a 100 mbps link between Chicago and London? Right now, I am transferring two 4GB files in two sftp sessions. Each file transfer is running at a ...
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1answer
63 views

What's the fastest way of getting data into an AWS Lambda?

I have something I'll call a "microservice" running on AWS Lambda (using node.js). Basically it serves up condensed summaries drawn from a few hundred megabytes of binary blob. There are a lot of ...
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1answer
27 views

Does a Bonded NIC need more than one internet connection to be effective?

As I understand it, a "Bonded NIC" has two purposes: Redundancy in the event of a NIC failure Additional bandwidth The former would only protect against an internet connection failure in the event ...
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1answer
43 views

AWS - How to limit outward traffic amount? [closed]

I want to exploit the AWS free tier to learn and do some personal projects. However what worries me is the bandwidth limitation. Specifically, the AWS free tier FAQ states that "15 GB of bandwidth out ...
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19 views

how to monitor client bandwidth in saas app?

I am building a SaaS which allows customers there own space. They get a subdomain but they can also add their own custom domain by setting their CNAME to my server. The subdomains and custom domains ...
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2answers
77 views

Measuring 40Gbe performance

I've connected two hosts via a 40Gbe fibre link and would like to determine a baseline for data transfer between them. I'm seeing relatively low speeds (~620MB/s). It seems that the signalling rate is ...
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1answer
36 views

Bandwidth throttling linux to external subnets

I am looking to start up a new open-source mirror for my enterprise, but would also be interested in opening it up for external clients as well. However, for obvious reasons, I would like to limit ...
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1answer
177 views

Windows server 2012 r2 network speed to computer is limited to ~30mbps

We have recently installed Windows Server 2012 R2 in our school. I noticed, that bandwidth to one client is somehow limited to around 30mbps. This server is gateway to internet. When we had UNIX ...
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4answers
150 views

How to determine AWS EC2 network performance?

I am using an AWS EC2 Ubuntu instance that was set up and configured by someone else (i.e. I do not have access to the management console). This instance is primarily used to download files and sync ...
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1answer
38 views

Set a upper bandwidth limit for Infiniband HCAs

I have to deal with PCIe congestion and I need to find a way to reduce PCIe traffic. I get several IB cards in one node (among other PCIe devices). HCAs are FDR Infiniband. Putting those HCAs in FDR-...
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Hardware choosing and Bandwidth limitations on NGINX reverse proxy on a VPS?

Good afternoon friends. We are currently growing our infrastructure of a SaaS application and require 2 app dedicated servers, each running multiple instances of a nodejs application. The company ...
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627 views

When downloading two files, why does the second one not suddenly speed up after the first one finishes? [closed]

I have noticed that when I am downloading several files at a time, and one of them finishes, the bandwidth that it was consuming is not immediately apportioned to the others. For example, if I have ...
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44 views

ISP provides 400MB connection but behind iptables firewall I only get about 150MB

I have COX communications as my ISP and I have a 400 MB connection at work. I have had for years an iptables firewall I setup that runs great. CPU Info Intel® Core™ i5-2400 Processor (6M Cache, 3.10 ...
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1answer
13 views

How to perform upload bandwidth test with youtube before live stream?

I understand that it is recommended to perform a bandwidth test before starting a youtube live stream. So that we can select appropriate encode parameters for the stream. I do know that there are ...
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1answer
63 views

bandwidth monitoring by TCP/UDP port on Cisco 2960 or Linux

We have an international line between two sites with limited bandwidth. I want to monitor bandwidth usage between the two sites, and understand which type of traffic consumes the most. Ideally I ...
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Measure goodput before sending a response

My idea is to make it possible for web applications working on slower connections to fallback on alternative smaller asset versions(like images, videos, etc.). HTTP Live Streaming has similar behavior ...
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1answer
42 views

How can I find what file/user is consuming all the bandwidth on an SMB share? [closed]

I manage a windows server (2012 R2) that has an SMB share used by people across my company. Recently, people have been complaining that the share is slow, and I'm seeing that the network bandwidth is ...
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1answer
27 views

What is “full bi-section bandwidth” on AWS

Could somebody explain the concept "full bi-section bandwidth" in the context of AWS? I've seen the term mentioned in several places (Placement Groups, VPC peering). Say, I launch four c4.8xlarge (10 ...
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24 views

Scaling applications with heavy bandwidth needs

I've read 'youtube-architecture' but still do not understand one point. Assume I have a bit bigger content to deliver and one load balancer (nginx) points via reverse proxying to e.g. 10 back-end ...
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1answer
161 views

R1Soft Backup Very Slow?

Good evening Server Fault! I was recently contracted to help a company clean up and consolidate their network\server equipment, and I'm kind of stuck on one issue. I set them up with a new r1soft box ...
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1answer
70 views

Slow HTTP Throughput with NGinx

I had an issue the other day and you guys were very helpful. I've been racking my brain on this one for over a week. Basically, I have several nginx servers reverse proxying a python application ...
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1answer
39 views

Wordpress website consuming huge bandwidth on 404 pages

I am running a website on Wordpress and there is a lot of bandwidth consumption because of hits on 404. image showing the url being targeted to generate 404.. I am sure that the url "/wp-includes/...
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2answers
82 views

Track what is causing AWS RDS to use insanely high bandwidth

We are having a high traffic (100K hit/day) Drupal news website hosted on AWS. Its behind cloudflare & 2 Load Balanced Varnish servers. For some reason the bandwidth usage is very high for RDS. ...
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1answer
249 views

Wondershaper does not work

I am using wondershaper to limit download upload speed. What it does is, it limits download but then it blocks upload. I have an 1 gbit connection and I want to limit it's download speed to 500 mbps ...
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1answer
544 views

Baidu Spider causing 3Gb of traffic a day - but I do business in China

I'm in a difficult situation, the Baidu spider is hitting my site causing about 3Gb a day worth of bandwidth. At the same time I do business in China so don't want to just block it. Has anyone else ...
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1answer
57 views

What is normal / expected Azure bandwidth

We are assisting a customer with their first Azure setup which is an Azure A3 server in Northern Europe running Windows 2012 R2, II7 and SQL along with their own application. The customer actually ...
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170 views

TP-Link AP EAP120 proper setup : SSID and 2.4GHz frequencies

We are implementing a Hotspot wifi solution at a camp site. The Buildings are 3 floors with 16 rooms in each floor. There are 16 buildings like that. Every room can have up to 10 people. So at peak ...
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1answer
81 views

How does port forwarding work as it pertains to bandwidth usage

Let's say there are two servers: Server A with a 500mbps of available bandwidth and Server B with 1gbps of available bandwidth(same vendor). If there are a port forwarding configured on Server A ...
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1answer
66 views

Commercial Dedicated vs Shared Residential Internet [duplicate]

I recently purchased a server to mess around with. I want to be able to host a few of my own sites, but my home internet is about 5Mbps up and down. I was looking into colo at my local DC and they are ...
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71 views

Is possible monitor the VPN's bandwidth with Check_MK? How?

I would like monitor the bandwidth in the VPN of Juniper SSG5 with Check_MK. Is possible? How? For the moment I am monitoring the status with the check automatic (check_mk-juniper_screenos_vpn). ...
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34 views

How could iptraf-ng be fixing throttled bandwidth?

I'm facing a somewhat funny problem and need some fresh solution ideas to tackle. I've got two servers, both hosted on Hyper-V. One of them is running IPFire with its red0 interface looking straight ...
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1answer
37 views

How much bandwidth would 2 nameservers use? [duplicate]

I'm in need of 2 branded nameservers for my clients' domains. Couldn't find any information about that, but how much bandwidth and bandwidth speed would I need for those two DNS servers "just in ...
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Need advice on Apache 2.2.22 Win Server 2003, memory leak

I'm running Apache 2.2.22 on Windows Server 2003 I'm serving some tutorial videos on the webpage to some registered users. The webpage has up to 30 users at a time, I know this because of analytics. ...
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1answer
91 views

Is it possible to measure the used bandwidth per port on linux?

I am wondering if there is a way to measure bandwidth by a tcp/udp port under Linux? Means I search for a way to be able to tell, tcp/53 needs now 1MBit/s, tcp/80 needs now 4.5MBit/s. iperf is able ...
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4answers
151 views

httpd web server serving content different download rate from clients?

For our game we host its static assets on a VM that has just httpd installed and running on it (of course along some native linux things), in order to serve web content. MPM configured is worker with ...
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34 views

openvpn bandwidth and ping fluctuations

Good day all I have recently setup an OpenVPN server (which I have done in the past, a few times), this server has a 1 Gbps connection, however using a standard openvpn server/client config, ...
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3answers
227 views

LSI 9260-8i limited to max 200 MB/s (independently from the drives)

LSI MegaRAID 9260-8i controller is limited to max 200 MB/s transfer rates. The server is a HP DL180 G6, with CentOS 7 (64 bits) and we are testing 4TB SAS drives (Model: WD4001FYYG). The controller is ...