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For questions about network speed. Like bandwidth this tag is suitable when your question is about network congestion, speed, throughput and of course low bandwidth/speed problems.

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Which component(s) defines the link/connection speed in a network switch?

Suppose that a network switch is a xGbit switch. Which component(s) defines this speed? Is it the switch core? Is it possible to decrease the speed to < xGbits? Perhaps by using an adapter? ...
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0answers
12 views

What is my internet speed? [closed]

First three days The speed in the Router "192.168.1.1" is 5 mbit all the time, and in speedtest.net is 5 mbit. After 3 days The speed in speedtest.net dropped to 4 mbit, but still 5 mbit in the ...
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1answer
23 views

Cisco 892 Low WAN Speeds [on hold]

I'm getting really not-gigabit-close speeds on my Cisco 892 Router. LAN speeds are fine (750-800Mbps) but WAN speeds are awful. I have a PPPoE connection, and when doing a speedtest I get an average-...
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0answers
41 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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2answers
383 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
58 views

Different line attenuation figures for broadband upload and download [closed]

I would be interested to know why the line attenuation figures differ so much for upstream and downstream communication when the same copper/fibre cable is being used for the link to my house? PS ...
2
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1answer
112 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 ...
4
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2answers
50 views

Better throughput with 100 Mb NIC setting

Ran across something very odd today. Just had a symmetrical 100 Mb circuit installed at a site I’m contracting at. When the NIC is set for auto negotiate for duplex and speed, we only get ~96 Mb down ...
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1answer
138 views

Fibre vs Copper short Distance

I am thinking of running Fibre optic from one room to a Nearby ONT/Router, I currently have about 15-20 meters of Cat 6, With a Gigabit UFB internet plan. With a short distance of around 20 meters ...
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1answer
56 views

Can I tie together two cellular connections for more reliable upload speeds?

I don't know that much about network engineering (hence why I'm here) so please bear with me, or point me to somewhere else where I can get help. I want to be able to broadcast a high quality video ...
4
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2answers
88 views

What does ISP's Internet speed actually mean

Sorry if it's irrelevant for this forum, but I couldn't find any good answers online. I know that "Internet speed" isn't a stable thing, and the rate of getting a something online, for example ...
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1answer
755 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 ...
4
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2answers
234 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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2answers
699 views

Store-and-forward packet switching delays

My question arose as i was reading Computer Networking a Top Down Approach . The author said the following regarding packet switching: L = length of packet(bits) R = transmission rate(bits/sec) "...
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1answer
18 views

gigabit ethernet adapter [closed]

I'm having a Toshiba laptop and I'm trying to connect it to gig interface on Cisco 1941 router. my Ethernet adapter on my laptop currently is Realtek FE adapter, I tried to upgrade it realtek GBE ...
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3answers
777 views

Calculate max transfer speed in LAN network

We have a LAN network between consumers and producers servers. Producers' output path has been mounted in consumers. There is a 10 Gig switch between producers and consumers and the link between each ...
2
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1answer
70 views

What binary prefix, JEDEC or IEC, is used for calculating networking gear speed

What is the common practice of calculating a speed of an ethernet enabled device, and which standard (IEC or JEDEC) is used? I'm developing and testing a product that is interconnected via ethernet. ...
2
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1answer
496 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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1answer
34 views

International download speed problems [closed]

I have 2 servers in Singapore and Canada. Both pass local speed tests of ~100mbit/sec, but when transferring files between them, speeds can be as low as 20kb/sec. The Singapore server can still ...
2
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3answers
456 views

The Speed of Hubs and Shared Collision Domains

I am watching a video course from Brocade. The instructor says that "all devices on a single collision domain must operate with the same speed parameters -- for example, 100 megabits; full duplex. ...
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2answers
315 views

Can I increase throughput and decrease network latency by installing multiple NICs?

Is it possible to use multiple NICs and increase throughput and/or decrease network latency? If so, what would be the scaling limit? Thanks,
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1answer
121 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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1answer
145 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
381 views

Root path cost?

A little confused here. Im trying to determine the root port for SWITCH B. SWITCH C here is the ROOT SWITCH. I understand that to determine the root port you need to find the lowest cost path to the ...
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3answers
287 views

Does the direction of a throughput bottleneck matter?

If a network has a throughput bottleneck, does it matter whether the slow link comes before or after? For example: c wants to send something to h. the bottleneck is on h's side. What throughput ...
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2answers
84 views

Ethernet adapter 100 to 10

We have device that works with 10 Mb. Some of the customers have 100 Mb, so our device causes problems. To change our device to support 100 Mb is going to take time and cost a lot, so is there any ...
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2answers
167 views

Cisco 2900 Default Fast Ethernet Port Speed

What is the default speed of a Fast Ethernet Interface of Cisco 2900 Switch that was just reset to default settings using write erase? I'm asking because my Wireshark capture of ARP packets gives a ...
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0answers
123 views

hping interval calculation

I am puzzled by hping interval command. -i --interval wait (uX for X microseconds, for example -i u1000) --fast alias for -i u10000 (10 packets for second) --faster alias for -i ...
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1answer
21 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? ...
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2answers
93 views

Combining Two Networks With Hardware

My office has two internet connections and two routers and two networks. One network is used for the Internet connect and has great speeds. The second network runs our IP phones and is a backup ...
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2answers
1k views

How can a processor handle 10 Gigabit per second or more data rate?

I do not know if it is the right place to ask. It may be a very silly question. I assume that some processor has to process data frames for switching/routing. Modern processors have speed of few GHz. ...
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2answers
1k views

Switch Buffer Sizing

What is the relationship between a switches buffer size and the effect it has on latency? I am aware of the bufferbloat issue and understand that buffers that are too large in networks of slower BW (i....
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1answer
131 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 ...
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2answers
66 views

How to leverage a gigabit switch on a network without gigabit devices?

If I have ten servers, each with 100BASE-TX ethernet network cards, and I place a 1000BASE-T network switch between them, all servers are communicating as fast as they can, will the switch be handling ...
3
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1answer
80 views

Faster to slower port speed

I have a network switch that supports up to and including 1000 Mbps. If I have a Client A with 100 Mbps and Client B with 1000 Mbps connection, will: the connection between Aand B be limited to 100 ...
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0answers
43 views

10 Gbps network speed degrading

We have two Dell N3024 10 Gbps switches in a stacked configuration. These switches then have two link per switch heading into our SAN and a further 12 cables connected to workstations. All works fine ...
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1answer
118 views

How much influence does multicast and IPv6 have on latency?

I am looking for a fast and a diverse library for my game engine network. I have searched for a while, and I decided to use a simple one because of being fast to understand. I saw there are better ...
2
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1answer
132 views

Estimating latency via distance and betweenness

I want to compute the relationship between delay (latency) with distance and betweenness. More specifically, if I know (let's assume) that the distance and betweenness values for two different ...
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2answers
8k views

Switch Fabric Capacity vs Forwarding Rate

What is the difference between Switch Fabric Capacity and Forwarding Rate of a switch? Also, what other types of speed or bandwidth are there for switching?
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1answer
63 views

How to assure where the problem is occurring? [closed]

I actually posted this question yesterday. I'm here to ask you guys again after testing. ↓↓↓First of all, please see my question↓↓↓ My customers told me that the access speed is really slow markedly!...
4
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1answer
98 views

[L4, F/W]How can I deal with SPEED?

I have a problem about Speed when accessing web servers.. [Circumstances] Everything is OK, every packet flows well. However, now I have focused on the speed... That is, connection is ok [Issues] ...
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1answer
295 views

Li-Fi, hardware and software limits

Yesterday, I saw some new articles about Li-Fi. With speeds up to 1 Gb/s it seems like a very renovating technology. Can current hardware and/or software can actually handle this kind of speed? How ...
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3answers
2k views

Does Internet speed over cable depend on distance?

Perhaps the question I want to ask is not directly related to discussion subjects over here, but I couldn't find better place to ask. I wanna know how does internet connection speed depend on ...
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2answers
195 views

Testing local network speed

We've inherited an existing network that is a mixture of a cat5e, cat6, with switches and rj45 couplers that tie everything together. Is there a way to test a local network speed from one side of ...
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0answers
75 views

How many people share 1 Mbps of an ISP backbone? [closed]

We all know that all consumer based internet connections are shared and that ISPs protect themselves with "best effort" contracts, also we know that a client's 50 Mbps (for example) connection speed ...
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2answers
91 views

Building an IDS (Special considerations for speed)

Background I plan to build a Network Intrusion Detection System, (using a dual-homed desktop pc running Debian and Snort) that will sit between my ISP's router (home LAN) and an additional router (...
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2answers
70 views

Wifi speed 30 fold higher then actual speed coming in from ISP?

My ISP (Internet Service Provider) tells me that my Down speed is 10 Mbps (Megabits per second) and Up speed 1 Mbps. But when I'm searching for a wifi router, the average speed is 300 - 400 Mbps... Do ...
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3answers
159 views

If I double ISP speed will it double Wi-Fi speed?

I have a connection of 500Mbps. I clock speeds of 460-480Mbps when plugged in (Ethernet, Cat5e). But when I’m on Wi-Fi (even positioned above the router, 5GHz dual-channel 802.11ac) I clock speeds of ...
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3answers
113 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
79 views

impacts of Fiber on a LAN with external copper connection

Would there be any noticeable difference (or any) if one was to use fiber cables for their LAN even if there was a standard copper connection coming into the network?