3
votes
1answer
42 views

Should Skype be reliable in a corporate environment?

I've move this from SuperUser after moderator comment. Its not a discussion. I am asking if my theory is valid. I have been managing the IT function in a small software development company that has ...
0
votes
0answers
14 views

View historical data per IP with PRTG packet sniffer

I have recently set up PRTG's packet sniffer sensor for bandwidth monitoring. I am able to pull up historical data in 15 minute increments and see who was the highest user but I would like to see ...
-2
votes
1answer
65 views

why does a multicast server endlessly transmitting packets even no client require [closed]

i used to setup a multicast server using windows server 2003 OS, i can see a lot of packets transimitted from the server once it was started. Does it make sense when no one is requiring the multicast ...
0
votes
1answer
42 views

What size bandwidth pipe do I need? [duplicate]

I am currently hosting in a data center and paying a very large monthly bill. We are moving to a new office and I have been toying with the idea of installing a leased line and self hosting. Public ...
0
votes
1answer
74 views

How do I measure the maximum throughput over a timeframe?

I tried to find out the maximum up- and down- DSL throughput I can achieve on my local machine. I tried it with iptraf: On my server with $IP I started: iptraf -s and on my local machine: iperf ...
0
votes
3answers
90 views

How do I calculate the necessary bandwidth for my office with PCs and VoIP phones?

In our office we have 30 PCs, 2 WiFi and 6 VoIP phones connected to the network that consumes bandwidth. Basically 30 PCs are simultaneously using the Internet (like Facebook, surfing the web and ...
0
votes
0answers
23 views

Throttling bandwidth on a per group basis

I am wondering if it is possible to create a bandwidth shaping/throttling script that shapes traffic based on user group. That is, if user1, user2, are in user group group1, they will have 1mb/s ...
1
vote
2answers
194 views

Linux Speedtest (or download) capable of 10Gbps

We recently just got some brand new servers from Softlayer out of Dallas 05 that should have 10Gbps connectivity and I'd like to test this claim against a few locations. Does anyone have any good ...
0
votes
1answer
77 views

What do these two QOS script statements mean

I am studying the QOS utility of Linux -- TC -- recently, and today I encountered below two statments from a bandwidth-limit script on Linux: tc filter add dev eth0 parent 1: prio 1 protocol ip ...
2
votes
1answer
55 views

How to view network activity across entire domain?

Wondering if Windows Server 2008 R2 Std has any features that allow you to view network information like number of connections, current rate, total bytes, etc, for all computers on the domain? ...
2
votes
2answers
345 views

How to estimate network data transfer volume for a mysql database

When planning to port my application (Java+Tomcat+MySql) to a cloud hosting, I've found that one important factor to consider is the volume of data transferred to/from the database, as it is limited ...
6
votes
1answer
236 views

Are network switch data transfer speed limits per port or per device?

Sorry in advance for the newbie question! When network switches report speeds of say 100 Mbit or 1 Gbit, are they referring to the maximum speed per Ethernet port or is this the physical limit of the ...
2
votes
1answer
118 views

How should I estimate the amount of bandwidth available to an application?

I'm writing a function that will calculate the maximum number of concurrent streaming audio listeners supported an amount of network bandwidth, given stream's bitrate. listeners = (bandwidth in ...
1
vote
2answers
563 views

What determines the maximum throughput of a Cisco router?

I'm looking at Cisco's documentation on the issue http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf and I'm having a hard time getting the numbers to add up. ...
5
votes
1answer
1k views

Limit incoming and outgoing bandwidth and latency in linux

I realise many similar questions have already been asked, but so far I've yet to find a solution to my problem. I have a virtual linux server (running Debian Squeeze) that I use for testing of ...
15
votes
3answers
1k views

Connecting two desktop switches with more than one cable?

I was hoping to find a way to increase bandwidth between two desktop switches I have, and I wondered if connecting them with two cables (or perhaps three) instead of just one might increase ...
0
votes
1answer
90 views

Is there a command to check the network bandwidth of a server? (linux)

I am trying to compare different cloud server providers and one thing I am interested is the network bandwidth like 1Gb/s. Many vendors are not explicit in this respect. Is there a way in Centos to ...
0
votes
1answer
175 views

LAN bandwidth in Linux is low

everyone, I connect two PCs both with 1000Mbps NIC. One(A) of them runs Fedora 8 while another(B) runs Windows7. I test bandwidth between them with Ixchariot, it shows about 10Mbps. If A and B both ...
-3
votes
2answers
84 views

How much data can be sent and received at the same time on a T-3?

A T3 is rated for 45Mbs. What is the expected run time upload and download speed of a T3 assuming both are happening at the same time?
1
vote
1answer
420 views

Random gigabit bandwidth with my Samba fileserver

I own a personnal Fileserver, build on an AMD X2 platform, with an intel gigabit CT network adapter, running debian 6.0. I've built a raid5 (2To x 3), shared by samba 3.5.6 From my desktop computer ...
1
vote
4answers
930 views

How can I calculate the 95-percentile bandwidth usage of a network device?

My provider is billing my bandwidth using the 95-percentile method. I know what it is in principle (take measurements, throw the top 5% away and use the remaining highest as result). The question ...
3
votes
2answers
603 views

Monitor Internet bandwidth by IP in a LAN environment?

I am new to networking so pardon if this is a stupid question. I want to see how my users use the internet bandwidth. I have around 50 Users in the network and I am using a checkpoint edge series ...
3
votes
2answers
285 views

Determine what machine/device is consuming bandwidth

I sometimes help a small office with a few issues. About two months ago, they were complaining of poor internet performance. Long story short, I found one person running Carbonite on a Mac that was ...
0
votes
1answer
227 views

How to mark outbound FTP traffic with iptables?

i have a user called "testuser" in my debian system and i want to mark the FTP traffic going from testuser's account how can i do that? i use following commands to mark all the outgoing traffic for ...
-2
votes
2answers
310 views

Is ceph usable with only 100Mbps bandwidth between nodes? [closed]

I haven't great hardware, but my requirements are low, I would like to start using ceph so as to abstract filesystem location and allow potential easy scaling to bigger hardware in an hypothetical ...
39
votes
5answers
2k views

Is there a linux terminal command that lets you see the amount of data coming in to your tcp connections in real time?

It would be something similar to top, where you see your cpu processes in real time. I'm not looking for a GUI like Wireshark to do it.
2
votes
1answer
168 views

Measure Upload Speed between a client and our server

We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in ...
3
votes
2answers
840 views

lxc bandwidth control using tc

I am trying to restrict bandwidth inside my containers. I have tried using the following commands , But I think it is not getting effective. cd /sys/fs/cgroup/net_cls/ echo 0x1001 > ...
-2
votes
1answer
138 views

Bandwidths relation to data rate?

What is the relationship between bandwidth and data rate? I know bandwidth is usually just the difference betweent he highest and lowest frequencies but then how does data rate come into play? What ...
2
votes
1answer
80 views

Host data transfer limit calculations and network protocol headers

OK, this might be a really stupid question, but... I'm building a web app that utilises websockets. There's fairly rapid messaging going on, so I've been taking a look at the network traffic with ...
-2
votes
2answers
125 views

Bandwidth and Speed monitoring software [closed]

I am looking to get some advice on what you guys think would be a good fit for my requirements. My goal is to find software which would monitor internet speed (UP/DOWN), ping times and more(possibly) ...
3
votes
1answer
169 views

Bandwidth * Delay Product

I'm trying to calculate the bandwidth delay product between various hosts, and reading this wiki article, I am confused. From the acticle; Residential ADSL2+: 20 Mbit/s (from DSLAM to residential ...
2
votes
3answers
28k views

How to limit bandwidth speed from a router for a devices on a network? [closed]

How to limit bandwidth speed from a router for a devices on a network ? There are several devices accessing the internet thru a wireless network. I cannot change settings directly on the ...
4
votes
2answers
176 views

Is there a linux command/tool that will provide end-to-end bandwidth information between local and external host?

CentOS 5.x At times, I've wanted to know what general bandwidth constraints exist between my servers and an external server that I don't have control over. Is there a linux command/tool that could ...
-2
votes
1answer
721 views

How do I calculate my bandwidth requirements?

We have a facility that needs to upload approximately 20 3MB photos per minute to Amazon S3. These are coming from 10 different machines on our local network. We need to do this continuously for 16 ...
-2
votes
3answers
680 views

Why does a wired network slow down with user increase?

If you had a wired network, 20 PCs hooked up to a 100 Mbit/sec switch (same onboard ethernet port speed) and you were just sending some test data round. What is the technical explanation as to why 20 ...
0
votes
1answer
162 views

Server hard disk read speed and client download speed, is there a connection? [closed]

Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other ...
2
votes
2answers
304 views

Linux (but not Windows) downloads take all our Internet bandwidth

At the company where I work, we have a perennial problem with large downloads (not P2P, not just updates) by Linux PCs (various Ubuntus) swamping our internet connection. For whatever reason, this is ...
0
votes
2answers
534 views

How can I do bandwidth management using quotas on a Debian Linux based router?

I use a Debian Linux based PC as a router. Now, I want to implement bandwidth management using quotas. By that I mean when a user has reached their quota limit, their bandwidth will be reduced. I've ...
4
votes
4answers
2k views

finding the best network latency between two countries

I know there are many tools to test for bandwidth and latency, but they all rely on having at least one host from which you can run those tests. I wonder whether there's an online source or some ...
9
votes
2answers
840 views

How to find process which uses most bandwidth

How can I find the process which uses most bandwidth on a Linux PC? With iftop it's possible to find which connections produce most bandwidth, but how to find the process?
1
vote
1answer
128 views

Difference between peer network levels?

What are the differences between the network peer levels? I've seen peer1 2 and 3 tossed around the web and wondered what the differences were. Thanks!
4
votes
1answer
346 views

droping packet on iptables = wasting bandwidth?

recently I do this on my iptables : -A INPUT -p tcp --dst 192.168.0.0/16 -m hashlimit --hashlimit-above 32/sec --hashlimit-mode dstip --hashlimit-name hosts -j DROP it seems that if my client ...
2
votes
2answers
111 views

File transfer - Bandwidth flickering for no reason

We are experiencing file transfer issues. I try to troubleshoot this problem but it is really hard. Here is a screenshot I took while transferring a file from my workstation to another server. The ...
0
votes
2answers
67 views

Drop in passthru network monitor

I am looking for something that will allow me to take a computer with 2 NICs, and drop it in between a link of 2 things (router, server, computer, etc) and monitor all the network traffic, bandwidth, ...
0
votes
1answer
82 views

network bandwidth discrepancy

I have a cluster of machines with two 10Gbps intel network cards on each machine. 64 port Router, with each port of capacity 10Gbps is being used. when i try to measure maximum network performance ...
0
votes
2answers
383 views

Limit Bandwidth using Ubuntu Server

Intro - We are planning on applying for Bandwidth-on-Demand from our ISP which gives us upto 8Mbps of data upsteam/downstream. If we exceed the allowable bandwidth the ISP will bill us for additional ...
3
votes
6answers
473 views

Gaming on an office lan [closed]

don't shoot me for this one. I'm wanting to get a few of us in our team (say 5 players) to start playing a network game in the office (you know... team building and all that ;) ) - thinking that ...
12
votes
8answers
2k views

If I send data to my computer using its public hostname, does it actually go over the internet?

To clarify: I'm using my public hostname to connect to a MySQL database. The hostname resolves to my server's external IP (e.g. 1.2.3.4). Is the data I'm sending/receiving via the MySQL connection ...
1
vote
2answers
1k views

Network speed between 2 EC2 instances in VPC

I setup a vpc and launched 3 EC2 instances all in 10.0.0.0/16 subnet. I am wondering how these instances connected to each other, 100mbit, 1000mbit?