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Questions tagged [throughput]

For questions about network throughput, where throughput is the amount of data moved successfully from one place to another in a given time period.

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iperf3: why do client and server agree on data amount equal but differ on bandwidth?

I want to test a device for its throughput. Therefore, I am using iperf3. After sending data for 10 seconds, my server reports receiving the same amount of data but at a lower speed than the client. ...
Jakob's user avatar
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1 answer
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Can MAC fragmentation improve throughput fairness in 802.11?

If I fragment data on the MAC layer, can I improve the throughput fairness in 802.11? Initially, I thought so, because if a client always sends very long frames and another client always sends short ...
leonboe1's user avatar
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1 answer
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Testing for 10G throughput

I'm currently facing a throughput limitation in my small core network setup, and I'm seeking advice on how to optimize it for higher speeds. Here's the current setup: Equipment: Two small core setups, ...
CyberNun71's user avatar
0 votes
1 answer
521 views

How is the efficiency of Pure ALOHA derived using Poisson's Distribution?

Pure ALOHA has a vulnerable time of 2T where T is the transmission time for a single frame. Pure aloha has a maximum throughput of 18% but how is it actually derived from Poisson's distribution?
Salvino D'sa's user avatar
1 vote
0 answers
85 views

802.11ah Wi-Fi HaLow theoretical network throughput with 100s of clients

What is the theoretical network throughput of a 802.11ah WiFi HaLow network with lets say 300 clients connected to a single AP? The networking overhead is supposed to grow with the number of stations ...
Kozuch's user avatar
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614 views

What is the differences between flow control and access control?

We first apply access control methods to get access to the channel link followed by the flow control methods to stop the receiver from overflowing. Suppose we are using CSMA/CD in access control ...
S. M.'s user avatar
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1 answer
137 views

Can total throughput (read throughput + write throughput) exceed the bandwidth of a network?

I was looking at the counters on a machine in production and found that the read throughput was 3.5 GBps and the write throughput was 4.5 GBps ( the counter measures the read bytes and write bytes per ...
Volatile_volvo's user avatar
1 vote
2 answers
828 views

Slow SMB transfer rates with client direct to Cisco switch, normal when connected to a downstream Netgear switch

I have encountered a rather unusual problem that I'm having difficulty getting to the bottom of... Here is the configuration: SMB server ->(2x10Gb SFP+ LAG) Cisco SG500X-24 switch ->(1x10Gb SFP+)...
januszb's user avatar
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1 answer
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Rate vs Capacity vs Throughput vs Bandwidth

I've already referred to this question & all the answers to this question: Bandwidth vs Throughput vs Data(bit) rate I'm still confused about all the terms especially due to the last paragraph ...
schegu's user avatar
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3 answers
672 views

How could the line rate of T1 be 1.544 Mbps?

T1 signal is the output of a 24-to-1 digital multiplexer whose inputs are 64 kbps each (plus one framing bit). But a multiplexer is simply an electronic device that selects between several inputs and ...
Noob_Guy's user avatar
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How can I consider the noise from my neighbor in V2X? [closed]

I'm working in v2x and I'm trying to calculate the date rate for specific vehicles in the road. How can I consider the other neighbor's vehicle's interference when calculating the date rate for my ...
I_Al-thamary's user avatar
2 votes
1 answer
530 views

How to determine the required performance of my router?

I have currently a router in my office network which has maximum input rate of around 12 Mbps, and output rate of 27 Mbps on its uplink port to the ISP. Now we want to replace this old router with ...
Shyamkkhadka's user avatar
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1 answer
164 views

How to use SFLOW for per-flow throughput?

I have a working sFlow collector on my network (vFlow, available as an opensource solution on GitHub, very awesome). The collector is running, successfully receiving sFlow data from my network ...
Pete's user avatar
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1 answer
95 views

How to score links in a network represented as graph?

I am working on an academic research about networks. I have proposed my model a a graph that nodes are users with commodity hardware connected to each other via internet as graph links. I know this is ...
Ali Majed HA's user avatar
2 votes
1 answer
1k views

Collect UDP packets lost during iPerf test

I'm testing my network infrastructure where I'm using iPerf and UDP protocol. I'm using the following: On the server side: ubuntu@ip-172-0-1-11:~$ iperf -s -u and the client side: ubuntu@ip-172-2-...
Khalil Mebarkia's user avatar
4 votes
1 answer
660 views

Cisco 2960L and ISR 4331 throttled WAN speeds

I have tried finding a solution to this issue and the closest I have found thus far can be found here. https://www.reddit.com/r/networking/comments/8f2sn0/throughput_limited_by_cisco_2960_switch/ My ...
sixshakybones's user avatar
7 votes
4 answers
3k views

Can throughput exceed the bandwidth of a network

I took an introductory course to networking this semester and I was wondering: looking at things at the layer 4 level using TCP can the throughput on the network exceed its bandwidth? According to the ...
crommy's user avatar
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2 votes
1 answer
999 views

What is max speed of WiFi Direct (P2P)?

I'm looking for information on what kind of speeds theoretically can devices connected through WiFI Direct achieve, assuming all devices support WiFi ac?
kar's user avatar
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1 answer
369 views

Measurable performance impact of port mirroring on a firewall\security device?

I am setting up a network monitoring device which recommends that I create a mirror interface on my firewall/security appliance and send all packets to the monitor for sniffing, logging, and ...
HackSlash's user avatar
  • 101
2 votes
1 answer
297 views

What's the term for throughput including all Ethernet overhead?

If I understood correctly "goodput" applies to application data rate (i.e 1460 byte packets) while "throughput" also includes all protocol headers (1514 byte packets). What term should be used for ...
StackedCrooked's user avatar
4 votes
3 answers
127 views

Does distance of one user from WiFi AP have negative impact on other connected users?

One of my friends (that knows very well Wireless world) told me following: Consider we have high speed AP. If one user stays out of the range of AP WiFi (lets say 51 meter away) - he will have low ...
Maxim Shoustin's user avatar
1 vote
2 answers
4k views

Why is there a difference on the amount of data transferred during a UDP iperf measurement?

I have the following result from a UDP throughput test as measured by iperf3 $ iperf3 -u -t 10 -c 192.168.1.2 -b 100M -V iperf 3.6+ Linux pi-raspberry1 4.4.38-v7+ #938 SMP Thu Dec 15 15:22:21 GMT ...
ealiaj's user avatar
  • 113
2 votes
1 answer
139 views

What is Throughput/Goodput in Node-to-Node messaging

Upon researching, from my own understanding, throughput is the "measurement of ALL data flowing through a link" and goodput is the "measurement of USEFUL data flowing through a link". Knowing this, ...
jam's user avatar
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1 vote
1 answer
61 views

How get more data rate : Change the number of bits, the bandwidth or the packet duration

I found definition say that, the rate of packet is define by R=N/BD [b/Hz/s] where N is the number of bits , B is the bandwidth and D is the packet duration. So suppose that R'=N/BD. If I would ...
Monir's user avatar
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3 votes
1 answer
2k views

What is the relationship between throughput and latency

Looking at the structure of a TCP packet, such as discussed here: What is the internal structure of a mobile phone call packet/datagram?, this indicates that a TCP packet size is 192 bytes excluding ...
Zach Smith's user avatar
0 votes
1 answer
743 views

Is forwarding rate important for selecting a collapse core switch in IP camera implementation?

I need to select a core switch that will connect my access switch to an IP surveillance's server. The point is that in my network I'll have 109 IP camera sending real time traffic to the server and I'...
Enmanuel Medina's user avatar
2 votes
1 answer
360 views

IPoIB with Netem (Latency emulation) Poor performance

I have to emulate a wide area network. My setup contains two servers with MT27500 Family [ConnectX-3] Infiniband cards. Default latency between both nodes is ~0.4ms and iperf test shows throughput of ...
Khayam Gondal's user avatar
6 votes
2 answers
6k views

Cisco Router (ISR4221) Throughput - Why so slow?

I'm looking for a new router for a new branch of hour company. I got experience with cisco L2 & L3 Switches but not that much with Routers. I was looking at the ISR4000 series, specifically the ...
Geo's user avatar
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1 vote
1 answer
4k views

How can I calculate the network throughput using ping responses?

I have the tcpdump data for the below mentioned command.This is to perform a test on the network to derive the bits per second. Is it possible? sudo ping6 fd9c:b4f9:3108:1045:213:5003:59:324e -c 10 -...
Maverick's user avatar
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4 votes
3 answers
2k views

Theoretical: Bottleneck in a switch stacking environment

Quick question regarding stacking environments and their limitations regarding traffic bottlenecks. Assuming the following use case: We have a stack of 8 switchs, forming a Half 10Gbps stack ring. ...
bdes31's user avatar
  • 1,085
3 votes
2 answers
2k views

Cisco routers THROUGHPUT - MTU and packet size

I am researching the throughput of my Cisco routers. For now I know that throughput depends from packet size and configured services like NAT or ACL filtering. My question is about packet size. For ...
John's user avatar
  • 812
1 vote
1 answer
1k views

Calculating the Jain Fairness Index of two connections - what values to use?

I'm using GNS3 and I have 3 VMs. I established two simultaneous TCP connections to an iperf server I created on VM2. VM-1 -- VM-2 VM-3 -- VM-2 Using the iperf -c <IP of VM2> command, I ...
Lars's user avatar
  • 13
2 votes
1 answer
82 views

Do packets take the same amount of time when they are within the MTU?

Without considering application processing or deep packet inspection, do packets that do not fragment all travel through the network at the same speed? For example, if there is a network with an MTU ...
user's user avatar
  • 21
1 vote
3 answers
1k views

How to detect the available bandwidth on a link without congesting it?

A lot of applications have been designed to help us detect the bandwidth on a link (Link throughput capacity) connecting two servers such as iperf. Unfortunately, these softwares congest the network ...
محمد جعفر نعمة's user avatar
1 vote
2 answers
240 views

Throughput up to 1.2Gbps?

As everybody know that we have 10/100/1000Mbps port. So I wonder that with 1000Mbps port, we just have maximum throughput at 1000Mbps (1Gbps), but some Firewall product, example Cisco ASA 5515-X, ...
Yuri's user avatar
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1 vote
1 answer
874 views

What is the max throughput I should expect a Cisco 3560-PoE to have for a small network?

I have a Cisco 3560 48-PoE. I am trying to use it for imaging computers. I can make it work but I only get 1gb a minute. I have tried various tweaking but that's about has high as I can get. What ...
johnny's user avatar
  • 149
0 votes
2 answers
1k views

Throughput in a 2 link network

I was reading "Computer Networking; A Top-Down Approach" by "Kurose Ross" that I bumped in a question. Consider a 2 Link Network with a router as the following picture: by definition: The ...
Aidin.T's user avatar
  • 103
4 votes
2 answers
2k views

Can I increase throughput and decrease network latency by installing multiple NICs?

Is it possible to use multiple NICs and increase throughput and/or decrease network latency? If so, what would be the scaling limit? Thanks,
Shuheng Zheng's user avatar
12 votes
6 answers
74k views

Bandwidth vs Throughput vs Data(bit) rate

I totally understand the difference between bandwidth and throughput. While bandwidth shows the maximum amount of data can be transmitted from a sender to a receiver, throughput is the actual amount ...
Nara's user avatar
  • 133
3 votes
1 answer
302 views

How troubleshoot poor ipsec connection?

I have a site-to-site ipsec connection which has low throughput, but the ethernet connection itself between the same endpoints is good (ie without ipsec there is high throughput). The ipsec routers ...
rigor's user avatar
  • 89
0 votes
1 answer
75 views

Finding the TCP throughput for intermediate switches along a transmission path

I am working on network simulation where my network should be as close from real-world conditions as possible. I am coding a function that calculates the latency and bandwidth of between switch A and ...
Don's user avatar
  • 103
0 votes
1 answer
3k views

Use iperf to split multiple tcp streams between 2 NIC on same client (similar to IxChariot)

I have 2 PCs connected to each other using two 1 Gbps ethernet link, to have an aggregate data bandwidth of 2 Gbps. In IxChariot, I can create multiple TCP pairs and split them into: PC1_LAN1 <-&...
eecs's user avatar
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1 vote
3 answers
663 views

Does the direction of a throughput bottleneck matter?

If a network has a throughput bottleneck, does it matter whether the slow link comes before or after? For example: c wants to send something to h. the bottleneck is on h's side. What throughput ...
842Mono's user avatar
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0 votes
1 answer
1k views

How to calculate throughput in Kpps? [closed]

I'm going to buy a firewall.For the first step i must calculate my network throughput in Kpps. I'm using Mikrotik routerOs. Mikrotik has bandwidth test that it shows traffic in Kbps. How do I find my ...
mrb's user avatar
  • 93
1 vote
1 answer
1k views

How to verify that the connection is 10G? [closed]

I have 2 servers connected with 10G cable between them directly. I need to know that the connection is good and it has indeed 10G throughput. I used IPERF to verify the bandwidth. According to the ...
theateist's user avatar
  • 111
0 votes
4 answers
8k views

Lower throughput with fixed TCP window size?

I used iperf3 to measure the effect that the TCP window has on throughput. I am measuring the throughput between two virtual machines which are located on different physical hosts. So I wrote a Python ...
arne.z's user avatar
  • 101
1 vote
1 answer
2k views

Cisco ASR1001 licence throughput measurement

Cisco ASR1001 comes with 2.5G throughput license and later you can upgrade to 20G. I have question if i have 10G link and i get attack of 5G and i use ACL to drop all packet on ingress interface in ...
Satish's user avatar
  • 4,379
4 votes
4 answers
4k views

Delays and throughput

I have the following Questions regarding Delays and throughput Is transmission rate same as Bandwidth? What is throughput and while calculating throughput why do we consider transmission delay. ...
Aditya Sharma's user avatar
1 vote
2 answers
163 views

Why does throughput (consumed BW) increase when the packet error rate is increased in the TCP?

I was simulating TCP used by dailymotion.com, and I noticed that when I increased packet error rate, the consumed BW was increased. How?
ds459's user avatar
  • 353
3 votes
0 answers
2k views

How do switches behave on multicast? [closed]

I am benchmarking multicast throughput of my LAN using an application that considers all the servers as group members. The network consists of homogeneous servers (S0-S9: 192.168.21.70-79) inter-...
محمد جعفر نعمة's user avatar