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thumb|right|Cisco 1800 Router 180px|thumb|right|Nortel ERS 8600 thumb|right|Cisco 7600 Routers A router ( in the USA and Australia, in Canada, the UK, and Ireland, these last two making a pronounced distinction with the tool used to rout wood) is a networking device whose software and hardware are usually tailored to the tasks of routing and forwarding information. For example, on the Internet, information is directed to various paths by routers.

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Wikipedia About Router

thumb|right|Cisco 1800 Router 180px|thumb|right|Nortel ERS 8600 thumb|right|Cisco 7600 Routers A router ( in the USA and Australia, in Canada, the UK, and Ireland, these last two making a pronounced distinction with the tool used to rout wood) is a networking device whose software and hardware are usually tailored to the tasks of routing and forwarding information. For example, on the Internet, information is directed to various paths by routers.

Routers connect two or more logical subnets, which do not necessarily map one-to-one to the physical interfaces of the router. The term "layer 3 switch" often is used interchangeably with router, but switch is a general term without a rigorous technical definition. In marketing usage, it is generally optimized for Ethernet LAN interfaces and may not have other physical interface types. In comparison, a network hub does not do any routing, instead every packet it receives on one network line gets forwarded to all the other network lines.

Routers operate in two different planes :

  • Control plane, in which the router learns the outgoing interface that is most appropriate for forwarding specific packets to specific destinations,
  • Forwarding plane, which is responsible for the actual process of sending a packet received on a logical interface to an outbound logical interface.

Control plane

Main: Control Plane

Routers are like intersections whereas switches are like streets.

Control plane processing leads to the construction of what is variously called a routing table or routing information base (RIB). The RIB may be used by the Forwarding Plane to look up the outbound interface for a given packet, or, depending on the router implementation, the Control Plane may populate a separate forwarding information base (FIB) with destination information. RIBs are optimized for efficient updating with control mechanisms such as routing protocols, while FIBs are optimized for the fastest possible lookup of the information needed to select the outbound interface.

The Control Plane constructs the routing table from knowledge of the up/down status of its local interfaces, from hard-coded static routes, and from exchanging routing protocol information with other routers. It is not compulsory for a router to use routing protocols to function, if for example it was configured solely with static routes. The routing table stores the best routes to certain network destinations, the "routing metrics" delay,distance,queue length associated with those routes, and the path to the next hop router.

Routers do maintain state on the routes in the RIB/routing table, but this is quite distinct from not maintaining state on individual packets that have been forwarded.

Forwarding plane (a.k.a. data plane)

Search results for Router

Network Router - What Is a Router - Wireless and Wired Computer Networking

A wired or wireless router is typically a small piece of computer hardware. ... Router Setup - Two Routers on Same Home Network? ...compnetworking.about.com/cs/routers/g/bldef_router.htm

What is router? - A Word Definition From the Webopedia Computer Dictionary

This page describes the term router and lists other pages on the Web where you can find additional information. ... See "Common Router Settings" in the Quick ...www.webopedia.com/TERM/r/router.html

router definition | Dictionary.com

Definition of router at Dictionary.com with free online dictionary, ... connecting a cable modem to a router. computer router questions ...dictionary.reference.com/browse/router?jss=0

What Is a Router?

An online computer dictionary and internet search engine for internet terms and techincal support. ... A router is a device that forwards data packets along networks. ...www.webopedia.com/DidYouKnow/Hardware_Software/2005/router.a...

Troubleshooting router-to-router VPNs

Cause: LAN and WAN routing is not enabled on the calling router and the answering router. ... To create a PPTP-only router, set the number of L2TP ports to zero. ...www.microsoft.com/windows/windows2000/en/advanced/help/sag_V...

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News about Router

Belkin ADSL Modem with Wireless 54G Router

Jersey InsightNo box, instructions suplied in cd, in very good condition/working order.http://www.jerseyinsight.com/redirect.aspx?module=11&c_ad=2:...

Verizon Portable Hotspot a Hot Product for Business

PC World via Yahoo! NewsNovatel's MiFi personal hotspot is an idea so good that I am shocked it is just now coming to market. And, for once, a cellular company has gotten the pricing right. Carry-around connectivity has taken a great leap forward.http://news.yahoo.com/s/pcworld/20090508/tc_pcworld/verizonp...

Verizon 3G Hotspot Saves Money Without Subscription

PC WorldVerizon will soon carry a Wi-Fi router that broadcasts its EV-DO connection without monthly fees, offering per-day use instead of requiring a contract.http://www.pcworld.com/article/164524/Verizon_3G_Hotspot_Sav...

Security Fix Live With Brian Krebs

Washington PostSecurity Fix blogger Brian Krebs answers your technology questions and offers ways to protect yourself from online security threats.http://www.washingtonpost.com/wp-dyn/content/discussion/2009...

Macs With 3G — More Connectivity, More Problems

Slashdotnarramissic writes "In a recent blog post, Josh Fruhlinger muses on the possibility of 3G radio receivers turning up in future Mac notebooks (as foretold by Apple job postings and the mention of WWAN hardware in Snow Leopard beta releases). 'At first glance,' says Fruhlinger, 'this seems like a reasonably awesome idea.' But will the target market be willing to take on the additional telecom ...http://apple.slashdot.org/article.pl?sid=09/05/09/0247200&fr...

News about Router

Juniper bolsters branch router, switch lines

IT WorldJuniper Networks this week will extend its branch office line with routers and switches designed to enable remote workers to securely access enterprise resources at lower cost. The new offerings include downscaled versions of Juniper's SRX Services ... http://www.itworld.com/networking/67403/juniper-bolsters-bra...

Tested: Archos 2, Candy Bar Cam and Nike LunarGlide+

Technology.timesonlineThe Candy Bar is easy to set up: attach it to your home network’s router using the supplied ethernet cable, run the software on your PC and it registers itself automatically. After that you can detach the cable and leave it to broadcast 640x480 ... http://technology.timesonline.co.uk/tol/news/tech_and_web/pe...

Novatel MiFi Portable 3G-to-WiFi Router Available from Verizon This ...

Mediabistro.comThe New York Times' David Pogue got an early look at the soon-to-be-released Novaltel MiFi 3G-to-WiFi personal router with Verizon Wireless service... You can see a Novatel rep displaying and describing its features in the video from notebook.com ... http://www.mediabistro.com/mobilecontenttoday/hardware/novat...

Camera, Wireless Router, Speaker, Rice Cooker

Local1. Canon Powershot A720is, 1GB card, battery, charger, data cable, bag. All together for 750kr . Still in good quality, check my photo album http://www.flickr.com/photos/ohwin 2. Speaker "Creative", bought from SIBA in January 2009, 100 krhttp://www.thelocal.se/noticeboard/21832/

How-To: Port Forwarding On an Airport Extreme & Time Capsule

CNN Money( gigaom.com ) -- When I moved into my new apartment I brought with me a 1TB Time Capsule that I was previously using as a network storage device because my old roommate already had a Linksys router. None of my new roommates had routers, so I decided ... http://money.cnn.com/news/newsfeeds/gigaom/big-tech/2009_05_...

Search results for Router

router - definition of router by the Free Online Dictionary, Thesaurus ...

rout·er 1 (rou t r) n. One that routs, especially a machine tool that mills out the surface of metal or wood. rout·er 2 (r t r, rou-) n. 1. One that routes, especially one who ... http://www.thefreedictionary.com/router

router news, reviews and downloads on CNET

Come to CNET for the latest news stories and articles, trusted editor and user reviews, and software downloads related to router.http://www.cnet.com/topic/router.html

What is router? - a definition from Whatis.com - see also: routing

On the Internet, a router is a device or, in some cases, software in a computer, that determines the next network point to which a packet should be forwarded toward its destinationhttp://searchnetworking.techtarget.com/sDefinition/0,,sid7_g...

router - Definition of router at YourDictionary.com

a person or thing that routs out or a tool for routing out; specif., a plane for gouging out recesses and smoothing the bottoms of grooves http://www.yourdictionary.com/router

router definition of router in the Free Online Encyclopedia.

router. Portable electric power tool used in carpentry and furniture making that consists of an electric motor, a base, two handle knobs, and bits (cutting tools).http://encyclopedia2.thefreedictionary.com/router

Wikipedia results for Router

Router - Wikipedia, the free encyclopedia

A router (pronounced /ˈraʊtər/ in the USA and Australia, /ˈruːtər/ in Canada, the UK, and Ireland, these last two making a pronounced distinction with the tool used to rout ... http://en.wikipedia.org/wiki/Router

Router (woodworking) - Wikipedia, the free encyclopedia

A router is a woodworking tool used to rout out (hollow out) an area in the face of a piece of wood. It was a tool particularly used by pattern makers and staircase makers and ... http://en.wikipedia.org/wiki/Wood_router

Residential gateway - Wikipedia, the free encyclopedia

For example, a home router is considered a "residential gateway" because it tends to lack features of more powerful routers such as the Cisco line of routers; However, this does not ... http://en.wikipedia.org/wiki/Residential_gateway

Wireless router - Wikipedia, the free encyclopedia

A wireless router is a network device that performs the functions of a router but also includes the functions of a wireless access point. It is commonly used to allow access to the ... http://en.wikipedia.org/wiki/Wireless_router

Open Shortest Path First - Wikipedia, the free encyclopedia

For this, each OSPF router collects link-state information to construct the entire network topology of so-called areas from which it computes the shortest path tree for each route ... http://en.wikipedia.org/wiki/Area_Border_Router
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Videos found for Router

LIMAC R4000ATC Series CNC Router

LIMAC R4000ATC Series CNC RouterClick here to watch the videoVideo - Video

Change Router Password

Change Router PasswordChange the password to access your router. This is not the password for WiFiFlash - Video

Router Bits

Router BitsA review of a 35 piece router bit set at http://www.routertabledepot.com This set has a good variety of router bits that wont make you stop in the middle of a project because you...Flash - Video

Top Tips on Network Router Configur...

Top Tips on Network Router ConfigurationIf you want to set up your own network, and you have multiple computers, you will need to set up a router. Cable (wired) routers, while still legitimate, are quickly becoming...Flash - Video

Best Of... - How To Upgrade Your Ro...

Best Of... - How To Upgrade Your Router's FirmwareSave some money and upgrade your router using Tomato Firmware yourself!Flash - Video

Answers for Router

Evan HRouter????????????Evan HYour modem plugs in the WAN port of your router. Your PC plugs in a LAN port of the router. Your PSP gets the wireless signal (you have to configure it)Laura MHow can check if somebody is using my wireless router?Laura Mno, login to your router. If you are using a netgear router, type in Routerlogin.com and if it asks for password and stuff type ADMIN for the username password for the password. Than it'll log...Daniel BCan a wired router and wireless router work simultaneously?Daniel BYou should never use 2 routers on the same connection as they can cause conflict. Either replace it with a wireless router (it will also have a wired connection) or better buy a wireless access point ...argh.pirateCan I put a plunge router in a router table?argh.pirateThe difference between a plunge router and a stationary router is that to use the router by hand,you can set the depth of cut by turning down the ruler knob on the side of the router to the depth tha...mike rWhat type of wireless router do I need to hook my wii up to the internet if I dont have a computer?mike ryes you need a computer for wireless router to program it . the best thing to do in your case is connect the wii via Internet cable with Nintendo LAN adapters that you can get at gamestop or Eb games ...
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