Questions tagged [bandwidth]

For questions about bandwidth where bandwidth is the amount of data that can be carried from one point to another in a given time period (usually a second). This tag is suitable when your question is about network congestion, speed, throughput and of course low bandwidth problems.

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4
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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. ...
2
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1answer
15k views

iperf: send specific volume?

I wanted to test some different test cases. I wanted to transmit 1MB, 10MB, 100MB, ..., 1GB, ... and measure bandwith with iperf. In the manual stands that I can use a combination of -l and -n ...
2
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1answer
6k views

Iperf results on UDP Bandwidth

I am currently testing iperf with a view to automating some testing servers for our company. To do this I am using an iperf server in the cloud which is well connected and is only 5 hops away from ...
1
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1answer
257 views

What is the meaning of the word 'band' in the following terms: broadband, baseband and bandwidth?

I am interested in the terminology of the following words: baseband, broadband and bandwidth applied in tellecomunications. What is the meaning of the words, how were they formed and what do they mean ...
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3answers
233 views

Does bandwidth limit apply only from my ISP to my network?

My network is subscribed to a 16 Mbps cap. So if I download a file from let's say Facebook, does the ISP download the file from Facebook at a different speed then sends it to my network at 16 Mbps? Or ...
1
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1answer
615 views

Setup a server for traffic monitoring using wireshark in bridge mode [closed]

i was able to get a hold of a server with 2 ethernet ports to start learning about traffic inspection using wireshark. The server and software are setup. I would like to know how i can configure the ...
22
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4answers
9k views

Does physical distance affect download speed?

I just had an argument with a colleague of mine and thought I'd just reach out to the experts on this. Here's the scenario. We were using a website that measures your connection's speed. We tested ...
0
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1answer
1k views

Frame size, propagation delay and bandwidth relationship [closed]

I found in some forum this formula for calculating the frame size in function of the propagation delay and the bandwidth : frame size >= 2*(propagation delay)*bandwidth, I could not however find ...
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3answers
849 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 ...
2
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1answer
3k views

What are the capacity and speed of a cable?

In my work, I come across with a cable with TB/s capacity and speed in GB/s. I did some search and found and article from Cisco trying to explain the two terminologies in terms of a water tap. The ...
3
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1answer
293 views

Differences between Enterprise internet connections with the same nominal bandwidth

First of all, I am new to the forum and am unsure whether this is the right place to post my question. If this is not the right place, I would appreciate you letting me know the best website to ask ...
3
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2answers
1k views

What is Interface's Nominal Bitrate?

If you check show int tranceiver command on Nexus Switch 10Gbit Ethernet port, the output shows the nominal bitrate is 12000 MBits/sec instead of 10000 MBits/sec. As I know 12 bytes Interframe Gap + 8 ...
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1answer
308 views

Is bandwidth a sum of network speed each computer in sub network?

I'm not good at English But I really confused about this. I used the word computer but it can be mobiles or any of devices which can have networking. Let just the Internet bandwidth is 100Mbps, ...
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1answer
457 views

Does Server Internet Bandwidth affect internet client download speeds

I'm studying computer networking and have a good understanding of tcp/ip how data travel across the internet and etc. But one thing I keep wondering is that does a Server's Internet Bandwidth affect ...
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1answer
558 views

TC & Qdisc Rules with 'Leaf' classes [closed]

I'm trying to determine a class which would be used as default for new IP's on my network, here's my current setup: # Delete qdisc rule tc qdisc del dev br-lan root # Add qdisc rule tc qdisc add dev ...
5
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1answer
14k views

How To Limit a VLAN to a Specific Bandwidth Quota

I have a Cisco Router 1900 series and I would like to limit the bandwidth used by a subnet/subinterface. This subnet/subinterface (192.168.10.*) uses most of the bandwidth making it useless for other ...
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1answer
241 views

Abnormally Bandwidth utilization goes high what should I do

We have 20 MBPS Internet lease line, suddnly my bandwidth utilization reached peak that causes slowness of internet. I am not able to trace whether the problem is and what should I do? Please assist ...
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2answers
1k views

How can I limit bandwidth usage of a network interface? [closed]

I used a cluster with infiniband 40Gb switch. For the sake of testing my application program, I need to measure the performance at a network environment with lower communication speed such as 1Gbps ...
0
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1answer
421 views

Limit bandwidth of a particular application [closed]

How to limit the connection (upload and download) speed of a particular application (e.g., a particular exe file) in accessing the internet? Apparently, it is easy to allow or block completely using ...
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3answers
181 views

How do cable internet providers limit user bandwith?

How cable internet providers limit their bandwith? Are they using SFTP service? If yes, how does all that work?
0
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1answer
53 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 ...
3
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1answer
90 views

In 802.11 Wi-Fi, Is it better to be on the same channel as other networks instead of being in an overlapping channel?

While being on the same channel as another network is not ideal is it better than being on a neighboring overlapping channel because 802.11 spec has methods for dealing with co-channel interference? ...
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2answers
89 views

Why do bitrates increase in powers of 10?

Bitrates supported by switches, routers and network cards are often 10 MBit/s, 100 MBit/s or 1GBit/s. Newer developments promise up to 10 GBit/s. I do not see a reason why powers of 10 should have a ...
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1answer
275 views

what is bandwidth and its relation with bitrate?

Digital signal consists of many sine waves. Now the signal with waves of frequencies 1Mhz to 5Mhz has bandwidth of 5-1 = 4Mhz. Now the fundamental period of this signal is decided by lowest frequency ...
4
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2answers
994 views

Equal WAN bandwidth for all LAN devices using Sonicwall NSA 2400/2600

I have a Sonicwall NSA 2400 (soon to replace with NSA 2600). The LAN has a widely varying number of users/devices. Some days there are 10 people onsite, some days 75-100. I want to be able to ...
4
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3answers
5k views

QoS or more bandwidth?

Being in SP field I sometimes hear folks say "we do not need QoS, just let's make sure we have enough bandwidth". This has always been bothering me, because currently we have a network without any QoS ...
3
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2answers
5k views

What's the difference among bandwidth, ping, ping rate and latency?

All these terms are quite related but I couldn't understand when to use which. I often hear that some networks have low bandwidth and high ping rate for online gaming. I thought they might be ...
3
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2answers
547 views

Switch bandwidth management

How is bandwidth managed in an unmanaged network switch? Suppose that port 1 is connected to a a very busy server. If suddenly machines connected to ports 2, 3 and 4 decide to send a massive amount ...
1
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1answer
845 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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2answers
1k views

how can i monitor traffic on particular port in 3650 L3 switch?

I have cisco WS-C3650-48TS SW version 03.03.05SE as L3, i need to monitor the traffic on a trunk port? How much bandwidth its consuming?
2
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1answer
38 views

What is the N½ value of a network?

In the context of HPC interconnect networks (Infiniband, OmniPath, ...), I've come across the notion of the N½ value of the network, which is supposedly some performance number. What is this number? ...
3
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1answer
1k views

understanding Policy map bandwidth , police, shape commands

Can some one please help me understand the below QOS setting on our MPLS router the service policy.. Policy map and class map I know the basic understanding behind how these work .. I need to in ...
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1answer
188 views

What would be faster between a consumer 1gbps symmetrical Internet connection and a 1gbps data center link to the Internet? [closed]

Say I've got: a home server with a consumer fiber optic Internet connection via FTTH nearing 1gbps downstream/upstream a dedicated server with the exact same hardware specifications in a data center ...
4
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1answer
1k views

How does bandwidth throttling work

I'm trying to understand the basic mechanics of how throttling works. Here are two scenarios: Scenario 1: A hotel offers a fast and slow connection option to its guests. Let's say the slow plan is ...
2
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1answer
3k views

Time Division Multiplexing and Transmission Rate

According to my textbook, with TDM, each circuit gets all of the bandwidth periodically during brief intervals of time (that is, during slots). If we have a circuit switched network where each link ...
2
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1answer
2k views

Significance of Bisection Bandwidth, Full Bisection Bandwidth, Subscription and their differences

I am confused by the terms Bisection Bandwidth, Full Bisection Bandwidth, and (Over/Under)-subscription. How do they all relate to one another in Data centres and in the general sense? I believe ...
1
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2answers
1k views

Why are downloads slower if the server is far away?

I know that because of the distance the data has to travel, and light only being so fast, the connection will take longer, and the first bit should arrive slower than downloading from a server which ...
2
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2answers
110 views

full utilization of bandwidth and its physical significance

I was reading the following extract: A LFN is a network that offers a high bandwidth but also a very high delay. An example could be a satellite connection. These connections offer a high ...
1
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1answer
105 views

Overutilized spikes on a 128k circuit

If I have a client on a 128k MPLS circuit going through a Cisco 2900 router and using QoS that's splitting it up into two 64k tunnels, is it possible for traffic to spike up to 256k for a short period ...
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2answers
152 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?
6
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2answers
229 views

Merging multiple clients to one gigabit

Suppose I have a switch that supports Gigabit Connections and Auto Uplink. Also, suppose that I have 4 clients (A, B, C and D), each with 100Mbps NIC's connected to the Gigabit Switch such that the ...
7
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1answer
260 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 ...
1
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1answer
168 views

Throttling Internet speed to device or vlan

I have a Netgear FVS318N Firewall/Router, GS752TP Switch, and a Netgear WNAP210 AP. After a bit of searching, I have identified a machine that is using the lion's share of bandwidth (youtube). Is it ...
2
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1answer
189 views

Understanding sliding window technique via real example [closed]

I have two questions: Can someone simplify the knowledge of windowing that is commonly used by connection-oriented protocols like TCP? I generally understand it is a technique for flow control but I ...
4
votes
2answers
486 views

Network latency and network bandwidth correlation

Today I was pinging random websites, and I decided to ping a website, from which I was downloading at the speed of 2mb/s, and the ping(latency) was 10 ms. My question is, if the answer from the ...
2
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1answer
3k views

How to calculate propagation speed?

Two routers are connected via ethernet, to find the propagation delay between them, we calculate Distance/Propagation_Speed. How do I find the propagation speed between the two routers?
2
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1answer
263 views

Understanding the effect of transmission rate change in network

Suppose there are 4 switches connected using a normal ethernet cables of speed 100mbps as follows: (S1)---100mbps---->(S2)----100mbps--->(S3)----100mbps--->(S4) Now suppose the link between ...
1
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1answer
688 views

SNMP bandwidth and response time

I've been trying to learn about SNMP Protocol (as a beginner) When studying network performance, we look at three main points: - Bandwidth - Response Time - Devices Availability But which of these ...
1
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1answer
111 views

NIC speed and PCI bus speed to be synchronized?

Is there any advantage point of having a Gigabit Ethernet if the PCI bus connecting NIC to Memory is a lot slower than that say just 80 MBps? In other words, I am trying to conclude that it makes ...
0
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1answer
4k views

GNS3: performance tests using iperf3? [duplicate]

I'm running some performance tests on GNS3 (I know I shouldn't, but it is not until Friday that I will have the college lab available), and I'm trying to compare real BW or "speed" and ...