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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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92 views

why iperf3 UDP throughput is lower than the TCP throughput?

I'm running an iperf3 throughput test from my PC to another one, going through a router. I've tried the same configuration for TCP traffic and for UDP traffic. However, for UDP traffic, I get worse ...
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44 views

Limited bandwidth only when switch is connected to router

I have a very strange problem in my network. My computer is connected to a switch (Cisco SF300-08, 100Mbit). This switch is connected to a dual wan router (Cisco RV320, 1Gbit) and this router is ...
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1answer
20 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 ...
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1answer
39 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 ...
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1answer
75 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-...
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1answer
146 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 ...
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4answers
2k 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 ...
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1answer
154 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?
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1answer
105 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 ...
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1answer
91 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 ...
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3answers
92 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 ...
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2answers
319 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 ...
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1answer
57 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, ...
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1answer
55 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 ...
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1answer
494 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 ...
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1answer
412 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'...
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1answer
175 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 ...
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2answers
4k 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 ...
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1answer
856 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 -...
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3answers
790 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. ...
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2answers
1k 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 ...
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1answer
555 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 ...
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1answer
61 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 ...
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3answers
651 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 ...
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2answers
149 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, ...
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1answer
446 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 ...
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2answers
537 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 ...
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2answers
597 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,
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5answers
50k 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 ...
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1answer
267 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 ...
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1answer
45 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 ...
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1answer
1k 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 <-&...
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3answers
485 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 ...
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1answer
884 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 ...
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1answer
757 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 ...
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4answers
5k 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 ...
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1answer
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 ...
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4answers
3k 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. ...
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2answers
144 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?
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0answers
1k views

How do switches behave on multicast?

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-...
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2answers
3k views

Where are UDP packets lost during iPerf test?

I'm testing a 802.11 wireless link using iPerf and the UDP protocol. Using the -b command at the client, I can set the bandwidth to an arbitrary number (e.g. 1 Gbps) that's much higher than the link ...
2
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1answer
228 views

RSSI versus available bandwidth, cellular context

In surveying cellular "coverage" over a geographic area, one could record any of several metrics, RSSI and practical bandwidth/throughput (e.g., Speedtest) among them. I understand that RSSI is ...
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1answer
3k views

How to determine the throughput of the TCP connection?

APP 1 sends data to APP 2 over a TCP connection through an IP network. The one-way delay is 10ms. The TCP connection bandwidth is 100 Mbps. The system starts up with a WINDOW set at 4,000 bytes....
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3answers
219 views

Bandwidth is mimimum of the path?

Assume the Internet speed is 10 MBps, NIC is GigabitEthernet, PCI bus connecting to RAM is 133 MBps, disk IO is 70 MBps, and this server simply accepts files and stores them to disk and then returns ...
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2answers
2k views

Cisco throughput testing with null:

Long ago, I read (I don't recall where now) that one may test a link's throughput by copying a file from a remote source to a local Cisco router's null: file system. I thought it was a great ...
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0answers
2k views

Calculating total time and end to end delay for datagram packet switching [closed]

I'm not asking for answers but rather guidance on whether am i doing it right. The question is as follows: Consider the transfer of a data file of 10^6 bits from a source to a destination for the ...
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1answer
539 views

Wireless throughput decreases over distance. Does the signal's effective range decrease as more clients connect?

This is probably a two- or three-part question. Let's set a sample environment first: We're using one AP One 2x2 radio antenna Omnidirectional 802.11n (2.4GHz) Up to 30 client devices Mounted to ...
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0answers
374 views

Can I do an RFC2544 test with a JDSU SmartClass Ethernet and a C1921?

I need to do RFC2544 tests of about 70 links, in different locations, before July ends and I only have about 11 JDSUs, so for some of this tests I won't have 2 JDSU available where I need them. Is it ...
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1answer
241 views

Throttling among Data Centers

In general, links among data centers are shared (having shared network infrastructure). Thus, I can't detect the available bandwidth in between two data centers that may vary every while and through ...
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1answer
694 views

can average througput be greater than bandwidth?

Is it possible for the throughput to be greater than the bandwidth of the cable ?Is it normal to have an average throughput of 10.401 Mbits/s on a cable of 10Mbits/s ?