In computer networking and computer science, bandwidth, network bandwidth, data bandwidth, or digital bandwidth is a measure of available or consumed data communication resources expressed in bits/second or multiples of it (kilobits/s, megabits/s etc.).

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How do I ensure a REST API does not have a bottleneck when it receives requests? [closed]

I'm creating a REST API that will listen on a public URL and accept uploads of large amounts of data. I understand how to scale software processes using message queues, but what I don't understand is ...
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3answers
840 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 ...
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191 views

Speed limit on streaming/downloading MP4 files

Even though other file formats are downloaded fast, MP4 files are downloaded / streamed at max of 160 kb/s I checked everything that may limit the bandwidth but couldn't find it. How can i make ...
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242 views

Calculate How Much Bandwidth you Need for a Given Number of Users

If I know how many users will be using a site, and about how many will be on at once, and I can approximate how much data is being transferred between the user and server, how can I calculate the ...
3
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103 views

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 ...
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232 views

MySQL connection errors when client server bandwidth is exhausted

I have several servers with a lot of outgoing traffic using nginx. When the bandwidth is exhausted (1Gbit), I have problems connecting to my mysql server from those servers. The connect always fails ...
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371 views

Openvpn limit bandwidth

I would like to ask you a question concerning openvpn and the possibility to increase the bandwidth in case I want to transfer files. I have an openvpn server via which I connect to my data center. ...
4
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2answers
291 views

Mysterious Bandwidth Usage

We use a SonicWall NSA 3500 as our main router. We have a SonicWall Analyzer virtual appliance too that takes information from the NSA 3500 and determines all kinds of stuff, such as bandwidth usage. ...
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90 views

Traffic Shaping Script Not Working

I wrote a script trying to use HTB algorithm to limit the throughput of specific ports, below is the script: tc qdisc add dev eth0 root handle 1: htb tc class add dev eth0 parent 1: classid 1:1 ...
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104 views

nginx and cloudlfare ip confusion?

I am using the below config in http block of my nginx.conf to get real ip while using Cloudflare acceleration service: ## Cloudflare settings to get Real IP's set_real_ip_from ...
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39 views

Balancing server bandwith

I am working on a file uploading website. It will be run on dedicated server with 1GBPS connection. I wanna offer visitors max download speed possible at the current moment. So lets say server can ...
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38 views

Cisco bandwidth guarantee based on remote host address

On my cisco I have softphones connecting to some external host. How can I assure to all traffic to/from this external host to have its minimal bandwidth (in case of congestion) of 2Mbit? All other ...
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115 views

big speed difference on a network link with and without VPN tunnel

Scenario: We have a network link between two offices. The link is provided by a third party company through a VLAN on their network, but to us it is totally transparent -as if we had a simple ...
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28 views

Is It Possible to Attach multiple Ports to a TC Filter?

I need to limit the bandwidth/rate by ports, and as a server there would be thousands of ports. Due to the limit of tc filter, I wonder if it is possible for multiple discreate ports to share a same ...
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1answer
45 views

How Many Filters Can We Have — LINUX QOS

I am doing Qos on Linux server using TC. According to the grammar of tc tool, the handle of a filter must be between 800::001 and 800::FFF. And because 0XFFF equals 4095 in decimal, so we can only ...
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2answers
185 views

why the dns related traffic is so huge, is my server being hacked?

I have a vps, and have several site on it, usually these sites are rarely being visited except myself, thus i am shocked by one fact that is i visit the vps provider's portal and find i have used a ...
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64 views

Why Parent Class In a TC Rules Tree Not Working

The parent class in my TC rules script doesn't work as it garanteed! Can somebody tell me what is wrong with my script? Here are some details about my question: From the chapter "9.5.4.4. Sample ...
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2answers
256 views

What Are VMware ESXi/vSphere Fault Tolerance Bandwidth Requirements

I plan on deploying a cluster of 2 ESXi/vSphere servers and having them run in fault tolerance mode. The virtual servers primarily be IIS & SQL. The physical servers will have a single Xeon ...
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8k views

Fortigate bandwidth monitoring

I have a Fortigate 200B with Forti OS 5.0. How can I watch the total bandwidth being used by my unit both incoming and outgoing? Thanks
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385 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 ...
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1answer
190 views

Why This TC Script Not Working

Our application has three classes of traffic, and every type of traffic involves three ports. We want to limit the traffic by port number via TC, so I made a simple TC script to have the test, however ...
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1answer
141 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 ...
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299 views

Can TC limit bandwidth by the Qos field of IP header

We are developing a client/server applications. There are three types of network data in our server app: Realtime data such as those of Video/audio, Critical Data such as those of Database data and ...
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1answer
61 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? ...
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254 views

Excessive ARP request with no reply

I had been monitoring our LAN setting due to slow bandwidth. In the wireshark, I am seeing an ARP request that is never resolve to a MAC address from the same IP address. I did a NMAP scan, the ...
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80 views

Bandwidth Reservation vs QOS

what is the difference between bandwidth reservation and QOS? for example, if I reserve 30Mbps to VOIP traffic on a router, is that the same of QOS? or does QOS work in a different way?
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67 views

Which one VoIP SIP audio codec should I choose to high quality calls?

The quality of VoIP calls depends on the codec used for the transmission and on the bandwidth of Internet connection. I want to use best optimized codec for my Internet connection. I have to select ...
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1answer
214 views

IIS bandwidth Monitoring

I have a public MS CRM 2011 install and one of my remote users reported using about 10gig of data from there outlook client. Is it possible in real time to see connected users in IIS and how much ...
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2answers
190 views

Can TC (Linux Qos Utility) limit bandwidth usage of target applications?

We have many applications running on the same server machine which is inside a network of servers. We want limit the bandwidth of our applications to specific value. So here are some choices: ...
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2answers
1k 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 ...
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1answer
126 views

Copy over lan : best way to segment copy?

I do not really know where to post my message. Networks or system or scripting, so ... I have a requirement in my company. Here is the goal : Monthly I'll have to copy a package> 500MB on 25 ...
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47 views

When CopyQueueLength is high, how do I control which server is the source?

When I have a DAG with copies spread all over the world, and the initial seeding is already complete, how does Exchange control which server is used to fulfill the outstanding CopyQueueLength logs ...
2
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1answer
576 views

is there such a thing as “too many packets per second”?

we have 2 offices in separate buildings. there is an ethernet link between the two. The link is provided by the company that manages one of the buildings, and they provide us with 100Mbps bandwidth ...
2
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1answer
83 views

how can I make sendmail go faster

We've recently had an overnight ISP outage in our area which brought down our mail system. Now that the connection is back we are trying to push through the mail queue faster. We've tried running the ...
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69 views

high bandwidth usage iscsid, who's doing it?

We run a couple of onapp nodes that connect through iSCSI to a SAN. This is now using up all bandwidth and we want to know where it is coming from, we have been search for days now and would like to ...
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41 views

Server bandwidth and website weight

I was wondering... Having the followings: a webserver with 100mbps output bandwidth (enough cpu and enough ram) a website 1 MB (Megabyte) heavy is the following assertion true? The server has an ...
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2answers
247 views

Does “ThirdPartyReplication” in an Exchange DAG reduce overall bandwidth requirements? [closed]

I have to re-seed several databases and am looking into opportunities to reduce my bandwidth requirements. When I issue the command get-DatabaseAvailabilityGroup there is a feature called "Third ...
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1answer
655 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 ...
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527 views

Is there any open source software for QoS (traffic control)? [closed]

We are doing QoS (traffic control) for our server application. This server provides file download service for users and we want to give different users different priority and bandwith. Suppose the ...
0
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1answer
65 views

Cheap bandwidth to Google apps (Dynamics E-mail Router hosting)

To give a bit of context, we are looking to host our Microsoft dynamics e-mail router to connect to Google apps e-amil. We are looking at many options from varying angles, but one possible option is ...
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1answer
93 views

Unusal internet traffic drop off [closed]

I'm after advice on how to approach a problem I'm having on my e-commerce site. Occasionally, the site suffers a levelling off of users on the website, compared to our historic traffic this is ...
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3answers
1k views

Cisco 881 throughput/bandwidth issue

We have a dedicated 30Mb connection (up/down) from our ISP, but we can only seem to get 10Mb (up/down) from the router. Does anyone know what we're missing, or how we can tweak the settings on this ...
2
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1answer
553 views

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 ...
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1answer
164 views

Controlling rsync bandwidth usage by percentage of available bandwidth, in userspace?

I often use rsync on a OSX-based laptop to synchronise some files from it to a Linux server. The laptop can be connected to different networks with greatly varying bandwidths (office ethernet, wifi, ...
2
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1answer
132 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 ...
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1answer
237 views

Socket based byte counts

I see a lot of tools to get the RX and TX byte counts for transmission on interfaces, is there any tool/program that I can use to get a total transmitted byte count for a single specified socket? I'm ...
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23 views

Control Usage Of bandwidth for each site

The scenario is as follow. Let's take an example I have one domain called abc.com.I have purchased this domain.Now I am providing facility to the users to create their sites on this domain.So suppose ...
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2answers
1k 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. ...
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3k 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 ...
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2answers
549 views

Dynamic throttling of bandwidth

I am planning on setting up streaming server. Streaming is done kind of like YT does it; there will be a large number of audio content and each user can listen to it right on the website. In order ...