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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4answers
136 views

does fiber optic transmit data as fast as light?

I dont know where to ask this question. So i think its best suited for networking community. As fiber optic transmit data using light. So we are getting/sending data at the speed of light ?? I did ...
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2answers
109 views

Can large ISPs really offer 1Gb “dedicated” service to every home and business?

Hopefully this is on topic for this site. While researching synchronous carrier service, so called EDIA or Ethernet Dedicated Internet Access, to a rural location in New Hampshire, USA, I came across ...
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230 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 ...
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1answer
2k 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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2answers
184 views

Network bandwidth management and priority

I'm trying to understand the mechanism by which bandwidth is consumed so that I can set the appropriate QoS and/or priority policies on the firewall. Here's the scenario: Our setup is a Fortigate ...
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1answer
77 views

Would multiple connections to a network make the connection faster?

So, in theory, if I connected to a network using, say, 30 ethernet cables from the same PC, wouldn't the upload speeds go up exponentially, because it would split the data over all the ethernet ...
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3answers
171 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?
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3answers
2k views

How test dedicated bandwidth - 10 Mbps

Level 3 has recently installed a dedicated internet conection (10 Mbps 1:1) in my company. When I use speedtest.net or any other test website, speed values are vey poor (1.56 for download, and 2.39 ...
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2answers
45 views

Reconciling multiple definitions of Bandwidth

I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could find are: difference between the upper and lower frequencies in ...
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2answers
346 views

Tx and Rx network metrics

Rx means Receive, and Tx means Transmit. I need to know how can i calculate link utilization (Bandwidth utilization) from these metrics ?, do i need to average them or getting maximum ?
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2answers
3k views

Why traffic shape/police ingress traffic?

Pardon me for my ignorance. I have not tried QoS nor traffic shaping/policing before. I have been pondering on whether can/why would we want to shape/police ingress traffic if you have no control ...
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2answers
213 views

How ISP track the individual subscriber data download and falling back to lower mbps?

I work on software development for routers. So, I am aware of QoS in routers, where we can do scheduling and policing of the traffic. However, one question is still in my mind, is how does the ISP ...
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149 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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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 ...
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1answer
95 views

TCP Bandwidth and delay guarantees

I was wondering if TCP can provide bandwidth and delay guarantees? Or does it have to implemented on the application layer?
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2k views

How to measure max bandwidth with Wireshark?

I'm trying to measure the max bandwidth usage of my LAN with Wireshark. I´ve done several packet captures but I don't know how to obtain the max bandwidth usage. Any Idea? Thank you in advance
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1answer
127 views

Bandwidth & shape average combined

Here is a class-map that our provider has configured : class ce_ef_output police 2600000 class ce_af1_output police 5360000 class class-default bandwidth 592 class class-default shape ...
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3answers
104 views

Do throughput rates include corrupt packets? Is throughput = packet loss + good packets or is throughput = good packets?

Normally network devices/software show some kind of current throughput. For example my home router shows the throughput for each connected device in its web interface. Or every web browser when ...
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2answers
1k views

How do I prevent any one user from hogging all the bandwidth?

We upgraded from 20 Mbps to 50 Mbps DIA about two months ago. This required a router upgrade as well. Since then, anyone who starts a large HTTP download - e.g. an ISO, large spreadsheet or log, movie ...
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1answer
231 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
15k views

Is it better to use channel 13 than channel 11 on 2.4GHz band

When I analyzed the wifi networks in my area, most of them are set on channel 1 and channel 6, so it would be most wise for me to set it on channel 11. My router however, provides the option to set ...
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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?
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43 views

Bandwidth, Latency, Download speed and Upload speed

In the midst of trying to diagnose a slow vpn issue, I'm getting a bit confused by the various metrics being mentioned by the many different techs I've been speaking with. From what I understand, ...
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1answer
25 views

Streaming Online Video from Home: Bandwidth and Provider Restrictions? [closed]

This is merely meant as a thought experiment, because I reckon it's generally a bad idea with regards to scalability, security, etc., BUT: Imagine a person wanted to start streaming videos from his ...
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1answer
53 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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2answers
504 views

What does minimizing maximum link utilization mean?

I was reading a networking material and it mentions that for optimizing a network, for congestion control and QoS, we need to minimizing maximum link utilization. I don't understand what does this ...
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3answers
816 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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1answer
412 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
346 views

Cisco IOS: Limiting internet bandwidth usage for specific VLAN

I would like to limit the usage of a 10 MBit internet connection for a specific internal VLAN to 2 MByte (on a Cisco router, IOS 15.3). Is that possible in general? How can the router make sure that ...
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1answer
232 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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1answer
348 views

questions about link aggregation

How many interfaces can we group as a link aggregation on a Cisco switch? How many interfaces, if they all are full duplex? Can we check the value of used bandwidth of ether channel group? How many ...
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1answer
485 views

High-Resolution Measurement of link utilization of Cisco (Nexus) Switch Interfaces

For a research project I need low timescale interface utilization measurement on a Cisco Nexus 5000 devices and some fabric extenders. Background: The switch is used to "simulate" an optical network, ...
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1answer
379 views

Networking, dedicating bandwidth to specific networks

I need to configure a cisco router where 5mb will be split between 2 separate networks one for voice 1mb and one for data 4mb with voice being the main priority. The only way i can think of doing it ...
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1answer
175 views

Dynamic bandwith sharing in SonicWall

In Sonicwall, we "split" T1 line into two lines: Internal LAN (so we can get on the internet) and Client line (so clients can work with server that we host). We simply dedicated 25% of bandwidth to ...
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1answer
50 views

Link utilization

I have a topology below (two switches S1 and S2), each interface has two metrics (ifinutilization and ifoututilization). %ifinutilization = ( (ifinoctets * 8) * 100 ) / ifspeed %ifoututilization =...
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58 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
1k views

Nokia/Alcatel Lucent SAR-8 7705 port utilization

Typically I use the following command to show port utilization percentage: monitor port 1/1/8 rate interval 5 As an example, this would result in the following output every few seconds: ============...
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1answer
98 views

Testing MCS Index Rates

my question might be a little too "newbie" style, but.. How can MCS index rates be set/restricted? For example, is it possible to set the MCS index to 5 at 20 Mhz bandwidth with 64-QAM Modulation and ...
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1answer
546 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 ...
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1answer
297 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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2answers
86 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
265 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 ...
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1answer
825 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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1answer
84 views

In what situations would the EIGRP process use the default 50% of the configured interface bandwidth?

I am in a class which conforms to the material in the Cisco Companion Guides, and I am currently using the Scaling Networks textbook. In it, the book explains how to adjust the percentage of ...
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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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1answer
160 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 ...
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1answer
183 views

Understanding sliding window technique via real example

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 ...
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1answer
679 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 ...
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2answers
194 views

ifHCOutOctets doesn't working with snmpget

How do i get counter64 to monitor hight bandwidth using snmp? Counter32 works! spatel@MBP:~$ snmpget -v1 -c public switch.cisco.com ifOutOctets.50 IF-MIB::ifOutOctets.50 = Counter32: 2038072800 ...
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22 views

What are the good hardware, software and equipment's suggestions to set up a wireless infrastructure? [closed]

I am working on providing wireless infrastructure suggestions to a client like what software, hardware and equipment will be required to a client in order for them to set up the wireless ...