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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246 views

Multi Chassis Ether Channel Best Practice

in our topology we have our Data Server(Multi Virtual Servers) and Backup Server exist in two different buildings and the current connection between them as below: Connection explanation: *1st ...
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1answer
47 views

LAN side 1Gb link showing WAN 4Mbps throughput in SNMP

I am a-bit confused here. I have a FW connected to L2 switch then to an ISP router. My ISP link has a 4Mb capped on the egress. [My FW] <-1Gb link-> [p0 L2 Switch p1] <-1Gb link-> [ISP ...
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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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468 views

increasing bandwidth between two Cisco switches?

2 Cisco 3750 switches are connected via port 22(Trunk). First switch consists of 3 VLANs(each vlan have 7 ports such as 1-7,8-14,15-21) and 2nd switch consists of 2 VLANs. what solution can i use to ...
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2answers
226 views

Finding the available capacity on switch interface in bytes or bits

Below is the output from my "show interface " command PE1.18:01:44#sh interfaces Ethernet 3 Ethernet3 is up, line protocol is up (connected) Hardware is Ethernet, address is 001c.7374.3d95 ...
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2answers
483 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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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 ...
2
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1answer
383 views

How does router do traffic control?

I googled a lot about this question, but I didn't find anything useful. If, let's say, the router just drop the packets when the transfer rate exceed the limitation, then there should be TCP ...
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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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5answers
201 views

How do two computers with different speeds communicate

This is one extremely basic and probably equally dumb question that I just couldn't ever find a definite answer to. Suppose we have 2 computers one that can transmit data at say 10 bits per second (A)...
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3answers
168 views

Stupid question about bandwidth

An engineer and I were discussing that if our network has more network than actual needed would cause wasting bandwidth. For examples, if our company has only 200 devices are actually on a network, ...
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1answer
13k 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 ...
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2answers
2k views

Speed benefits when switching from 1Gb copper LAN to Fiber Optic

We are trying calculate how will the network performance improve when we switch from 1Gb copper LAN to Fiber Optic. We have 5-20 people simultaneously working on a Server via the 1Gb LAN. There are ...
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1answer
231 views

What bits does iftop count when calculating and displaying the network bandwidth [closed]

I've googled and read, and googled and read. Everything I've found makes reference to it counting IP packets, but it obviously displays Bits/Byte and packets come all manner of size. What bits does ...
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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
5k 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 ...
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3answers
4k views

Why can insufficient bandwidth reduce latency?

In this article, it is stated that latency does not affect bandwidth, but insufficient bandwidth can reduce latency. Can someone explain me the latter part of the statement? How would insufficient ...
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1answer
222 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
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
534 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 ...
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1answer
940 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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2answers
463 views

How does link aggregation work in reality?

I'm concerned that I'm misunderstanding how aggregators work in the scenario below: I have a project where I need 40 Gbps links between switches. My plan was to have my three switches use all four of ...
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3answers
657 views

Max bandwidth of wireless access point with gigabit backhaul

I'm looking at setting up a network with full WiFi coverage. Right now I'm still comparing access points to mesh. I see the options for AC access points offer wireless bandwidth in excess of 1Gbps. ...
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3answers
800 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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3answers
14k 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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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 ...
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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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1answer
287 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 ...
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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
400 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
536 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
343 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
1k views

limit bandwidth on a Cisco switch port,

Our company has a 3/.5 DSL connection. On this connection we have a VPN where the execs are able to access files on the network as well as VOIP. On this connection we also have our exchange email ...
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1answer
403 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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5answers
62k 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
293 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
3k views

How does throttling of network traffic work (to limit bandwidth by ISP e.g.)?

I have tried to find the answer on how network throttling works e.g. by ISP when they limit your access to say 100 Mbps. As far as I know TCP/IP itself does not have any mechanisms for that, so it is ...
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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 ...
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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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4answers
426 views

How the Internet speed on PCs can be almost 100Mbps although the bandwidth of WAN is 155Mbps?

I thought a bandwidth is a number represent maximum amount of traffic. But it seems not. Let me show the Network map in my company. In this image. WAN has a 155Mbps bandwidth and there are a lot of ...
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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 ...
2
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1answer
86 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
80 views

Network report integrated with Active Directory or Users

How can i take network report of bandwidth consumption that integrated with AD or users? I have ASA 5506 and configured netflow 9 with PRTG, I can see the source IP and Destination IPs, Is there any ...
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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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2answers
212 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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1answer
84 views

Does link aggregation uses the full bandwidth?

If I setup a 2x 1Gig ports with link aggregation, will I get 2Gigs bandwidth or less? how less? thank you
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1answer
261 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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2answers
154 views

What are the implications of 'saturating' a broadband connection?

We recently switched from a business-class cable connection (100/20) to a symmetrical (100/100) fiber one. This serves a front office, a media department, and several client computers on any given day....
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1answer
990 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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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 ...