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I have a laptop which is connected to the internet with ADSL modem, and I would like to share the internet for any laptop connecting to wireless router from my laptop using hotspot . This is what I want:

|ADSL modem          |
|laptop's wired adaptor   |
|                         |
|Hotspot software         |
|                         |
|laptop's wireless adaptor|
|wireless router(linksys)|
|Laptop computers and cellphones |

How can I do that?

share|improve this question
your question ? – Logman Jul 27 '12 at 0:43
how to Hotspot on my laptop via wirless router – Mussie Jul 27 '12 at 0:52
you want to run a wireless hotspot thru a wireless laptop? This is still a very vague question... – Logman Jul 27 '12 at 0:55
Yes i want to run hotspot software on my laptop which is connected to wireless router. every laptop which are connected to wireless router should get internet through my laptop. – Mussie Jul 27 '12 at 1:03
Basically you're using the wireless router as a wireless repeater. You have to have a router than can work as a repeater instead of a router, or you'd have to flash new firmware into it. You are REALLY doing this the hard way. What is it you are trying to accomplish with this? We (Superuser) may be able to recommend a better way. – Everett Jul 27 '12 at 1:16
up vote 1 down vote accepted

The purpose of home/consumer routing equipment (I use the term loosely to refer to access points, hubs, switches, routers, modems, and any combination of the above) is to:

  • Remove the complexity associated with manually setting up a full-featured, robust and secure network (dedicated equipment, especially for the home, is almost as easy as plug and play)

  • Provide reliable configurations designed to work with a wide variety of client devices (or, you know, provide unreliable configurations that only work with that vendor's client devices.... AHEM Linksys I'm looking at you)

  • Tightly control the security of the network by providing a hardware firewall on a locked down device where the firewall cannot easily be altered, bypassed or disabled by programs (in other words, if you ONLY ran a firewall on your client computer, it would be riskier than having one on the router, which is a more secure environment due to how restrictive it is)

  • Provide better signal reception for wifi, more uptime, and power savings: the routing hardware itself consumes very little energy from the wall socket, especially when compared to the power consumption of a desktop or laptop. Also, the routing hardware provides better signal strength than you can expect from a laptop or desktop, because the shape of the router and the location of the antennae plays a large role in signal strength and reliability. And since the routing hardware uses integrated components that are low-power, active cooling such as fans, which add noise and consume power, are not necessary.

By trying to use computers as a passthrough for your internet connection and sharing that connection with downstream client devices, you lose all of the above benefits:

  • You lose the low-complexity factor because configuring a reliable routed network on a computer (regardless of operating system) is worlds more complicated than plugging in a router

  • You lose the reliability because rebooting your computer for updates, crashes, etc. is natural, and each time you reboot, any downstream clients lose the connection. Also, you can have programs on your computer taking up all the resources (CPU time, RAM, etc) that can slow your network to a crawl.

  • You lose the tight control of the IP-layer security because clever programs can disable your firewall on your computer (especially on an OS such as Windows) but it is much less likely to be possible to compromise a router, especially one running the most up-to-date firmware

  • You lose the excellent signal reception of wifi routers, which are tuned to provide longer range broadcasts than most "USB dongles" and PCI-E/Mini-PCIE cards that fit in laptops and desktops

  • You lose the power savings, because if anybody wants to use your network from one of the downstream clients, you have to keep the routing PC(s) online and running. If you're routing it through desktops in particular, the power consumption for older-generation video cards and CPUs, even while idle, can be pretty ridiculous.

For these reasons, I think you are asking how to set up a configuration that is just plain inadvisable.

On the other hand, it is possible to manually design your own highly reliable, low-power router using a miniature computer (such as a PandaBoard or a plug PC, a mini ITX, etc). Generally you would run a stable, mature, secure operating system such as OpenBSD or Linux on the device, and you would not use the computer for normal desktop usage, such as playing games, surfing the web, and so on. The device would be "dedicated" to the task of routing. If configured properly, such a device can provide all the benefits of a consumer router, plus adds configurability so that a networking expert can fine-tune the parameters of the routing, such as using a custom Active Queue Management packet scheduling algorithm.

If that's the way you want to go, I think you should educate yourself more about networking technologies and the details of how to configure a reliable routing package on a *NIX box (that is, Linux, BSD, etc). Then you can look into buying a small, low-power device, or build your own and shop for the best-quality network cards, etc. If you make the right decisions along the way, you could be very happy with the result, and it wouldn't be very expensive to do (the operating system software is free, if you use BSD or Linux).

Anyway, that's getting pretty off-topic. The short answer is that I think the best thing for you to do is to not try this. Unless you're up for configuring/building your own dedicated router, the best way to go would be:

<<internet>> --> <<any number of wireless access points, routers, or switches, as you deem appropriate>> --> <<client computers, both desktops and laptops, both wired and wireless>>

Unless you really know what you're doing (and if you did, honestly, you probably wouldn't be asking this particular question on SU), you don't want a computer "in the middle". Especially not a Windows computer that is also in service as an entertainment/productivity desktop computer.

share|improve this answer

What OS are you on?

If your laptop can create a hotspot then just connect other devices to that one. Use connectify to create the hotspot. Why should you need to some router go between? If the router can operate in bridge mode then this is no different than connect directly to the laptop hotspot except for longer reception range.

If your laptop has an old wifi card or using an old OS like XP then there is no way to create a hotspot

The best solution would be connecting the wireless router directy to the ADSL modem

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