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Questions tagged [bandwidth-measuring]

61 questions
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SSH & SFTP: Should I assign one port to each user to facilitate bandwidth monitoring?

There is no easy way to track real-time per-user bandwidth usage for SSH and SFTP. I think assigning one port to each user may help, but I am wondering if my approach is workable. Use case Bob, with UID 1001, shall connect on port 31001. Alice,…
BertS
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Method / Tools to analyze temporarily bandwith collapse

I've tested my server¹ with a python port of mechanize - multi-mechanize. I ran several pretty simple tests - but I always get a drop from 10mbits to some kb of upload bandwith. And I've no idea why. Whether I run 3,15 or 30 minutes makes no…
Lucas
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Is it possible to measure the used bandwidth per udp/tcp port on linux?

I am wondering if there is a way to measure bandwidth by a tcp/udp port under Linux? Means I search for a way to be able to tell, tcp/53 needs now 1MBit/s, tcp/80 needs now 4.5MBit/s. iperf is able to tell me this details, but my issue is I need it…
cilap
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1.73 Gbps at best on an Amazon EC2 10 Gigabit instance?

When I test my own '10 Gigabit' instances (c3.8xlarge) with iperf I won't see transfer rates exceeding 1.73 Gbps. This is at least four times worse than what a blogger at scalablelogic reports where tests show results of 7 Gbps and 9.5 Gbps. I'm…
niemion
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Monitor Exchange bandwidth by user / mailbox

We share an exchange servers between 5 different companies. Our exchange server is consuming a massive amount of bandwidth every month (up to almost a TB!). It's hosted offsite and our hosting provider charges a pretty penny for bandwidth usage. So,…
matthewpe
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Calculation of Xeon server memory bandwidth

I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz The configuration looks like this. 4 memory channels per socket DIMMs are 8x32 GB DDR4 2133/1866 modules per socket. JEDEC says DDR4/1866 peak transfer…
Frank Astier
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How reliable is /sys/class/net/eth0/statistics/rx_bytes for bandwidth statistics?

I found this script at https://github.com/Cosmologist/collectd-network-bandwidth-usage. Exec user "/tmp/exec-network-bandwidth-usage.sh" "eth0" It runs a bash script that checks /sys/class/net/eth0/statistics/rx_bytes…
ujjain
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How to count number of bytes used to by HTTPS handshake

Our application sends relatively large number of small requests (responses < 50 bytes) via HTTPS. I would like to reduce the server bandwidth usage. I want to tell how many bytes is used to establish the SSL connection, to see if it is worth to…
Derek Chan
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Bandwidth Manager Using Squid

I am trying to create a internet distribution software for an ISP (an internet distributor or a school or other such organizations) like the one here It will have restrictions and policies for users to limit bandwidth/speed/duration etc according to…
haywire
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Using darkstat to monitor bandwidth -- how to exclude my dynamically assigned IP address?

I am using darkstat to collect data about bandwidth usage on my local box. My internet connection is provided by a 3G USB stick, connecting to a mobile network. Each time I connect to the internet I am given a different IP address. My question is…
Jon Pawley
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How to Monitor and Log Port Usage and Destination Attempts of a local computer from a Linux Gateway?

I have access to a linux server that is acting as the gateway to an internal network. There is a MagicJack Plus device plugged into this network via CAT5. The MagicJack gets its ip via DHCP from the linux server, and I've determined which IP address…
LonnieBest
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How much PCI-E bandwidth can my SAS HDD array make use of?

Note: This question is real-world, but to analyse it, please note I've begun from a "theoretical" starting point of device and bus capability, which I acknowledge will not usually be at all representative of in-use bandwidth utilisation. I have an…
Stilez
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Network data/bandwidth accounting on a VM's network from the host/hypervisor side (libvirt/KVM, bridged networking)

On a server a few KVM/libvirt virtual machines are running. Sometimes these use lots of GB in network bandwidth. I would like to do statistics on network transfers (bandwidth usage, ideally by IP address) in order to rule out foul play (e.g. data…
Ned64
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How to calculate approximate wifi-bandwith when repeater is used?

When reading about repeater usage (without crossband-repeating) it is said that the bandwith is at minimum reduced by 50% because the repeater has to repeat every bit of communication. In principle i can live with this Statement, but how would you…
omonsees
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How to measure bandwidth per cpu utilization

I'm trying to measure efficiency of the networking system and looking for a tool that either allows to limit max bandwidth for each test or, ideally, limit cpu utilization. At the end I need to have an answer like "for 10% CPU bandwidth is…
Kentzo
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