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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35 views

Realistic Benchmarks for Comparing VPN Performance

I'm looking to quantify the performance of different VPN technologies as part of my PhD thesis and want to know if there are any standard metrics for end-to-end performance that are used to compare ...
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4answers
103 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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1answer
24 views

Bandwidth limit between CPE and Provider Equipment

I have 4 different WAN links for redundancy one of them is 15mbps MPLS and the other ones are 30mbps Internet , 50 mbps Internet and 10 mbps MPLS , the way that it is set up is that we have load ...
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0answers
26 views

ttcp command missing on Cisco 3850

We operate a hub-and-spoke network. The hub is a 3925. I have been using the ttcp command between the hub and each spoke to measure bandwidth. I realize that the test is flawed, but finding relative ...
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18 views

why we need to make the size of our burst 2 times the product of bandwidth and delay?

I'm new to Networking and I'm reading a textbook which says: The bandwidth-delay product defines the number of bits that can fill the link. This measurement is important if we need to send data in ...
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1answer
103 views

Getting lot of unwanted broadcasts on my network

I am pretty new in Networking (noob), while I was monitoring my network using Wireshark, and I found that there is a lot of broadcasts happening all over the network, broadcast on Local network ...
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0answers
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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0answers
11 views

Bmon - Find average bandwidth usage of a tool

I am using bmon network analyser and I am wondering if the way to calculate the average bandwidth usage of a scanning tool like Nmap, is to measure the total number of RX and TX bytes and divide them ...
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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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2answers
215 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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2answers
137 views

Fiber to copper conversion, what are the odds?

My ISP says they bring optical fiber to their junction box outside and they bring the copper cable inside from the junction box. And they're promising a symmetrical bandwidth with a speed upto 50MBps. ...
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2answers
562 views

Transferring data speed of Fast Ethernet

I am wondering that between 2 hosts in LAN, when i send one file which weights 1Mb versus 1 file weights 0.3Mb from the first host to the second host using TCP/IP protocol, would the latter come first?...
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1answer
83 views

RSVP bandwidth value configuration in Juniper MX

Can someone please explain is it a good practice to change RSVP bandwidth value of an interface? We have two bundle links between R1 and R2 namely ae13 and ae22 . Both R1 and R2 are Juniper MX ...
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1answer
433 views

Bandwidth limit Cisco 3400 ME problem

I want to limit bandwidth (speed) of interface of Cisco 3400 ME switch. I did these: policy-map parent class class-default shape average 64000 And in gi0/2 interface I apply it: service-policy ...
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1answer
92 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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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
111 views

Can I limit bandwidth for certain IP address, subnet or VLAN on Cisco 881?

I have a router with several workstations running on the switched ports. I need to limit their WAN bandwidth. I tried to use rate-limit on Vlan1, but it looks like it had no effect. What is the ...
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1answer
170 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
55 views

Estimating bandwidth requirements and productivity gain from traffic data

My small office has a 30Mbit/s internet connection, on which two or three people work. We could get twice the bandwidth at a substantial cost. I imagine a bandwidth upgrade would slightly improve ...
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2answers
171 views

Spine and Leaf architecture with LACP

In a spine and leaf architecture with Link Aggregation between spine and leaves (active-active) like this: Do we have the same active-atcive link aggregation between the leaf and the server? Is the ...
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4answers
408 views

What is the difference between Ethernet types, considering bandwidth?

Different types of Ethernet (standard Ethernet, Fast Ethernet, Gigabit Ethernet) have different speed of data transfer (10 Mbit, 100 Mbit, 1 Gbit). Why is that? On the physical layer, the speed of ...
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1answer
401 views

QOS police vs bandwidth - is this configuration wrong?

I understand bandwidth in QOS is use to guarantee a minimum bandwidth I understand police in QOS is to set a limit to the maximum bandwidth. class test_out police **1608000** 50000 100000 conform-...
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2answers
95 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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3answers
82 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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1answer
103 views

Is Cisco SG300-10PP & QoS appropriate to share bandwidth?

We're going to let some empty space in our office building soon. The potential client needs an internet connection for their systems (including VoIP).For ourselves we have a resilient ethernet setup, ...
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1answer
41 views

Leased 1GB fibre firewall with multiple IP LANS & tenants [closed]

I’m in desperate need of some unbiased advice and suggestions. Everyone I ask seems to want to sell me a £2-5,000 firewall appliance and £1500+ per year of support/licencing. I have a 1gb leased ...
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3answers
219 views

How can 1000BaseT transmit on Rx & receive on Tx pins?

How can 1000-BaseT (Gigabit ethernet twisted copper pairs) technology transmit over the Rx pins & receive over the Tx pins? It's baseband technology (hence the name), right? Discrete digital ...
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1answer
586 views

How to check the Juniper Switch's port bandwidth?

I use the CoS method limited the EX3300's switch port bandwidth to 200m. But I have a question, how to check whether it works? Is there the Juniper Switch EX3300's switch port have a bandwidth ...
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2answers
219 views

Why is internet speed called Bandwidth?

Why do we refer to our internet speeds as "bandwidth" with units of measurement like "10 Mbps"? As I understand it, Bandwidth is, as the name implies, the width of the frequency band, typically ...
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1answer
56 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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0answers
156 views

Cisco ASA 5512 one download blocks all others until download finishes [closed]

My company has a 50 Mbps Down/Up connection. I just migrated from a PIX 515E to an ASA 5512. Previously, one user could download a large file from the internet and block all other users from accessing ...
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1answer
155 views

different between Bandpass chanel and Baseband channel? [closed]

What is the different between Band-pass Chanel and Base-band channel? can we convert analog data to analog signal using base-band signal?
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0answers
827 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
96 views

Definition of bandwidth capacity for an internet connection

First, I want to test the data rate of a fibre-optic internet connection, but I understand that results are affected by the circumstances of the test, like number of hops between the CPE and the other ...
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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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2answers
191 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
44 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
893 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
319 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
175 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
342 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
86 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
337 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
704 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
190 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
141 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
8k 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
1k 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
192 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
154 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 ...