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Calculation of router bandwidth

To control the congestion,the simple way is to know the free bandwidth space in the router(intermediate node) but i dont know what is the real way to calculate it.could you please help me in this matter by providing me with description & a source code please..

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Re: calculation of router bandwidth

Easiest way to do this is use QoS (quality of service) if your router supports it.

Posted on Feb 07, 2008

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How many pc's, laptop's & printer's can i link up to belkin n1 vision wireless router model f5d8232-4

You can uplink a fairly good number of PCs or laptops with Belkin N1 as it supports high bandwidth. Keep in mind that upon adding every new PC, the overall bandwidth for the other PCs is reduced. If the PCs/ laptops do not require much bandwidth, you can connect / add more PCs to the network.
Generally, I have uplinked upto 10-15 clients to one router and the network worked just fine. It all depends upon the network environment and the bandwidth usage by each client PC. If the PCs are using just email and simple internet browsing (and remain idle for most of the time), you can add more clients to your network as not all the systems consume network resources at the same time.

Hope it helps! Good Luck!

Apr 01, 2011 | Belkin N1 Vision Wireless Router


How to divide bandwidth using cisco routers

The Bandwidth command's real purpose
First, let's discuss the real purpose of the bandwidth command. In the above scenario, the questioning administrator didn't understand the true purpose of this command, incorrectly assuming instead that the network would receive the bandwidth configured with the command.
The bandwidth command is only there to communicate the speed of the interface to higher level protocols. Most of the time, a routing protocol needs to know the speed of the interface so it can choose the best route.
In the case of routing protocols, IGRP, EIGRP, and OSPF all use the bandwidth statement. However, TCP will also adjust its initial retransmission parameters based on the bandwidth configured on the interface.
OSPF uses cost as its routing metric, which it calculates using bandwidth. For example, OSPF takes 108 and divides it by the bandwidth of the interface. To calculate the cost of a full T1, OSPF divides 100,000,000 by 1,544,000, which returns an OSPF cost of 64. (Cisco routers don't use floating-point math, so they drop the numbers after the decimal.)
On the other hand, EIGRP uses the bandwidth of the link to calculate its routing metric. Here's the EIGRP metric formula:
metric = [K1*bandwidth + (K2*bandwidth)/(256 - load) + K3*delay] * [K5/(reliability + K4)] We won't try to calculate a metric in this article, but as you can see, the process definitely requires using bandwidth. In fact, due to the default K values, the only values used to calculate the EIGRP metric are bandwidth and delay.
Examples You configure the Cisco IOS bandwidth command on interfaces. Here's an example:
interface Serial0/0 bandwidth 128 ip address This command has only one option—the bandwidth, in kilobits, of the interface.
Router(config-if)# bandwidth ? <1-10000000> Bandwidth in kilobits Router(config-if)#bandwidth There are always default bandwidth values set for each type of interface, such as the Serial interface, as shown below:
Router# show interface s0/0 Serial0/0 is administratively down, line protocol is down Hardware is PowerQUICC Serial MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, In the case of a serial interface, the default bandwidth is 1,544 K (or a full T1 circuit). However, you could have a fractional T1 circuit, and the default may be incorrect.
As you can see, setting the correct bandwidth on each interface is very important when it comes to routing protocols choosing the right router. However, no matter what you set the bandwidth command to, you won't actually get faster throughput out of any interface—the two simply aren't related.

on Apr 24, 2010 | Cisco 2610XM Router

1 Answer

It would seem that the router is not running fast enough. If I try Netflix it shows my movies but does not down load fast enough to run. What is going on here?

If you are currently using wireless to connect to your router, it might be a good investment to get a signal booster because if you are too far away the signal starts to degrade and slow the internet speed down.
If you are using a wired connection for the connection to the router, there are a multitude of things that could be slowing it down, ranging from internet congestion clear up to faulty firmware.
A few things can be done in order to help speed up the router's/Internet performance.
  1. Close any unneeded programs, this could be all because of a simple program trying to fetch an update.
  2. Check if it is just Internet Congestion, this is a simple one, try accessing the internet at different times of the day to see if there is just too many people running their internet at a time.
  3. Call your ISP, The Internet Service Provider (ISP) could be doing maintence on the network and could be slowing it down. They also could be blocking Netflix from streaming also, so make sure you contact them.
  4. Upgrade your router's firmware, a guide to this can be found on the manufacturer's website. Just keep a backup just in case because anything can happen.
  5. Get a newer cable, if your router is running off a CAT5 cable it could be a simple reason to the congestion. It would be a wise investment to upgrade the cable anyways to a CAT6. A way to identify what cables you have is to check the side of the cable, it probably will be printed on it somewhere.
  6. Turn off/Unplug unneeded Internet Using Devices, if you have a device on the network that uses internet it could be a reason for the latency. Some devices go on the internet to check for news, time updates, software updates, etc...
  7. Time to upgrade Internet Package, this one should be kept for last because it will be the most expensive to do.
These are just a few things that could be happening, but if none of these help, you might want to get a qualified technician to come and inspect the issue.

Jan 17, 2011 | D-Link DIR-615 Wireless Router

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I wanted to know what is the best wireless router compatible with motorolla SBV5120 cable modem? thank you very much

Motorola SB5120 intonly.gif
The Motorola SB5120 SURFboard® is a very popular, solid and reliable cable modem compatible with most cable providers. If your modem is two years or older, upgrading to the SB5120 has been known to show speed improvements up to 3X faster than older DOCSIS 1.0 modems. Set up is simple and fast.
  • Compact design: With its attractive and compact design, this cable modem won't clutter up your work space
  • Easy to maintain: Simplify troubleshooting with the handy font-panel LEDs and built-in HTML-based diagnostics
  • Stand-by switch: Disconnect the signal without unplugging the modem with the top-mounted stand-by switch
  • DOCSIS™ 2.0: Take advantage of DOCSIS 2.0 technology for up to three times greater upstream capabilities than older modems running on DOCSIS 1.1
Linksys BEFCMU10
Quick to set up at a great price, the Linksys BEFCMU10 offers fast connections to your cable broadband provider. Connect it directly to any PC with an available USB or Ethernet port, and you're ready to surf the Internet. With the Linksys Cable Modem, you'll avoid monthly rent charges, and make the most of your high-speed cable Internet connection.
  • Compliant with all industry standards: DOCSIS™ 1.0, 1.1, and 2.0 - compatible with any cable Internet provider
  • Ports: Ethernet, USB & Cable
  • Buttons: Reset
  • LED Indicators: Power, Internet Cable, Internet Activity, Ethernet & USB
  • Easy installation: One phone call to your Internet service provider completes the setup
D-Link DCM-202
D-Link's DCM-202 Cable Modem is powered by TurboDOX™ bandwidth acceleration software increasing your download speeds up to 20 times. The DCM-202 makes your broadband connection more efficient and effective by clearing network congestion, resulting in a boost in download speeds. With the DCM-202, you will get more out of your broadband connection with increased bandwidth and enhanced performance.
  • Always On, Always Connected
  • DOCSIS™ 2.0 Certified
  • Ethernet or USB Connectivity
1pix.gif Wireless Routers 1pix.gif
Netgear WGT624 Super G 108 Mbps Wireless Router Netgear's WGT624 108 Mbps Wireless Firewall Router is 10 times faster than 802.11b routers providing 4x the range of 802.11b devices, and double the range of most other 802.11g products. Your home network is secure with over 10 security and privacy features including a double firewall and wireless encryption. Netgear's Smart Wizard set up software gets you connected in 5 clicks or less!
  • Interoperable with existing 802.11b and 802.11g networks
  • Smart Wizard gets you up and running in fewer than five clicks
  • Lighted power, test, Internet, wireless and LAN status icons
  • Works with most Internet gaming applications that support Universal Plug and Play

Dec 12, 2010 | Routers

1 Answer

Slowed internet connection using wireless router...


Wired connections are faster than equivalently wireless connections (from/to the same node) and so your
experienced is quite normal.

Additional nodes divide the original bandwidth and denigrate the performance, which is why one tries to
maximize the original bandwidth (speed in MHz) of the connection to the gateway.

You can maximize your experience by having critical systems wired to the router, and this also provides
greater security than any encryption (which is another brake on your speed) necessary for a wifi

Make sure you have the fastest possible wifi card in your portable devices to maximize your speed.

Apr 10, 2009 | Linksys Wireless-G WRT54G Router

1 Answer

Router Dell-Wireless 2350 (Linksys)

First try to check if your router is really configured correctly. Then try to check your banwidth, because bandwidth can also make your computer freeze. Then check also your cable if it is ok. Then try also to check the disk space in your computer because if your disk space is full or almost full it can also make your computer to freeze.

Aug 20, 2007 | Dell TrueMobile 2300 Wireless Broadband...

1 Answer

How fast can the data go?

The speed of the cable modem is only one part of the equation. There are a combination of factors starting with how fast your PC can handle IP traffic, then how fast your PC to cable modem interface is, then how fast the cable modem system runs and how much congestion there is on the cable network, then how big a pipe there is at the head end to the rest of the Internet. Different models of PCs and Macs are able to handle IP traffic at varying speeds. Very few can handle it at 30 Mbps. Ethernet (10baseT) is the most popular cable modem interface standard for the PC. This automatically limits the speed of the connection to under 10 Mbps even if the cable modem can receive at 30 Mbps. Most Local Area Networks use 10baseT Ethernet, and although they are 10 Mbps networks, it takes a LOT longer than one second to transmit 10 megabits (or 1.25 megabytes) of data from one terminal to another. Cable modems on the same node share bandwidth, which means that congestion is created when too many people are on simultaneously. One user downloading large graphic or video files can use a significant portion of shared bandwidth, slowing down access for other users in the same neighborhood. Most independent Internet Service Providers today connect to the Internet using a single 1.5 Mbps "T1" telephone line. All of their subscribers share that 1.5 Mbps pipeline. Cable head-ends connecting to the Internet backbone using a T1 limit their subscribers to an absolute maximum of 1.5 Mbps. To create the appearance of faster network access, service companies plan to store or "cache" frequently requested web sites and Usenet newsgroups on a server at their head-end. Storing data locally will remove some of the bottleneck at the backbone connection. How fast can they go? In a perfect world (or lab) they can receive data at speeds up to 30 Mbps. In the real world, with cost conscious cable companies running the systems, the speed will probably fall to about 1.5 Mbps.

Feb 19, 2006 | Zyxel Prestige 310 (AM406100) Router

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