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.
188
questions
2
votes
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 ...
2
votes
1answer
450 views
QoS in a small network
I have a small engineering network with a Linux router, LAN nodes on the one side of the router, and a WAN link attached to the router. The WAN link is a 16mbit/s wireless channel, while the LAN nodes ...
2
votes
1answer
3k views
Limit Internal LAN Traffic and Internet Traffic - Managed Switch?
I have a small business network (192.168.10.x/24) with a pfSense firewall (about 20 hosts: mix of Windows, Macs and Linux machines and printers...). The ISP modem from the WWW connects to the firewall ...
1
vote
4answers
146 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 ...
1
vote
2answers
114 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 ...
1
vote
4answers
106 views
why we make each burst of data 2 times the product of bandwidth and delay?
Below is from my textbook:
if we need to send data in bursts and wait for the acknowledgment of each burst before sending the next one. To use the maximum capability of the link, we need to make the ...
1
vote
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
vote
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 -...
1
vote
2answers
188 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 ...
1
vote
1answer
80 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 ...
1
vote
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?
1
vote
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 ...
1
vote
2answers
602 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 ?
1
vote
3answers
17k 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 ...
1
vote
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 ...
1
vote
2answers
224 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 ...
1
vote
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?
1
vote
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 ...
1
vote
1answer
139 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?
1
vote
2answers
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
1
vote
1answer
144 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 ...
1
vote
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 ...
1
vote
3answers
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 ...
1
vote
1answer
258 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 ...
1
vote
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?
1
vote
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 ...
1
vote
2answers
72 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, ...
1
vote
1answer
26 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 ...
1
vote
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 ...
1
vote
2answers
542 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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
1answer
358 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 ...
1
vote
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 ...
1
vote
1answer
355 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 ...
1
vote
1answer
499 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, ...
1
vote
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 ...
1
vote
1answer
57 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 =...
1
vote
1answer
62 views
Monitor individual device traffic on Cisco RV042
I am able to monitor Total Traffic consumption on the Cisco RV042 router using SNMP and PRTG.
I want to be able to monitor traffic used by each device on my net
1
vote
1answer
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 ...
1
vote
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:
============...
1
vote
1answer
100 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 ...
1
vote
1answer
559 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 ...
1
vote
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, ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
1answer
85 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 ...
1
vote
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 ...
1
vote
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 ...
