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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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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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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What Is the Smallest Burst Value for HTB Algorithm (QOS)

Regarding the HTB algorithm, I want to know what is the smallest burst value in an HTB shaping rule such as "tc class add dev eth0 parent 1:1 classid 1:10 htb rate 5mbit burst 15k". Is it MTU?
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Varnish bandwidth accounting per domain - How to do it?

Does anyone know is there way to do bandwidth account per domain on Varnish. Or is there a way to use some other system to monitor how many bandwidth consumed per domain? Thanks
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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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24 views

Excessive data consumption over ppp0,can't find the culprit

I have an embedded computer that uses GPRS to access the outside world. I have several applications that run on the local network. I also have an application that communicates over the loopback ...
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123 views

How can I isolate the source of outgoing bandwidth usage on VPS server? [closed]

I have a VPS running CentOS Linux 5.x, with Kloxo server management software. I kept everything as close to default as possible. I created NS records with my domain name provider, and successfully ...
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54 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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150 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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4k 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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255 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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126 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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55 views

Can I use MRTG to show the cumulative bandwidth of all servesr together?

I am currently using MRTG to graph the bandwidth of my servers. It is working well, however I have only the bandwidth chart for each individual server/network interface. I would like to have one ...
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97 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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188 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
57 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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207 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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65 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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62 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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128 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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125 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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575 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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118 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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31 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 ...
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1answer
270 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 ...
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60 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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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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37 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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182 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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329 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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377 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 ...
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1answer
61 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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90 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
588 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 ...
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325 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
134 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, ...
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1answer
124 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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148 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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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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733 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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2k 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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383 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 ...
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2k 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 ...
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1answer
102 views

Does 404 errors eat the server bandwidth?

I am facing a strange issue where one of our servers (used for internal purpose) hosted by Rackspace uses huge amount of bandwidth (but our actual users are using the server rarely). FYI, the said ...
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83 views

Monitoring bandwidth on multiple hosts with no control of a router

I'm looking for ways to monitor bandwidth usage for some Linux servers (and a couple of Mac/Windows servers, but if I can only do the Linux servers that will be OK). I do not control the router that ...
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1answer
97 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 ...
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96 views

TC Bandwidth Shaping for all clients

I am running a video site and want to shape the download speed of all clients. How can I apply my tc class to all the clients by ip, i.e. every user has a download speed of 128kbit/s, no matter how ...
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165 views

What software to use to generate bandwidth graphs in real time? [closed]

What sofware could I use to monitor my server's bandwidth in realtime, or at least, update every x minutes. My server (dell r620) is connected to a routerboard Mikrotik rb1200. But, as my router is ...
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222 views

Bandwidth Usage: ActiveSync vs IMAP/CalDAV/CardDAV

I have been trying to find bandwidth usage information how the technologies compare. I understand that ActiveSync is instant, and new changes get "pushed" to subscribers. But IMAP/CalDAV/CardDAV is ...
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338 views

Can FTP bandwidth usage result in dropped SSH connection?

It seems highly implausible, even ridiculous, to me. I login by SSH to the CentOS server. I FTP to another server and begin a large file transfer out (uploading to other server). After some time ...