What do simultaneous connections mean

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  • Hello
    Probably a stupid question, but I can't find an answer to it anywhere.
    How many devices can a wireless router connect to at the same time? The data exchange between the device and the router is minimal. The only thing I found out is that the address space for IPv4 is 4294967296 addresses and for IPv6 ~ 3.4 x 10 ^ 38 addresses.
    thanks
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  • That depends on the router and can be a lot. Here is a link to a review. As you can see, the best router there has a maximum of over 45,000 connections:
    http://www.smallnetbuilder.com/tools/charts/router/bar/77-max-simul-conn

    Kind regards
    Jonas

    Last post modified: 9/8/2015 22:35:54 by jonas-bayer
  • That varies a lot, but it depends specifically on the exact question.

    If you mean "How many WLAN devices can connect to the access point at the same time": that depends on the access point and can range from a few to hundreds. In most cases, the number of possible connections can also be roughly read off from the price of the access point.

    But if you mean "How many connections can a device establish to any host in the network if it is connected to the network via WLAN", then the (theoretical) answer is: as many as there are hosts. In practice, your operating system and the not negligible network traffic will keep you from doing it if there are too many (many thousands / millions) hosts. The number of possible host addresses is the upper limit.
    Of course, the router also depends on its function: does it work as a router or as a NAT? With routing, the router does not care how many connections are open through it, because it only routes stateless packets. With NAT, it really depends on the router, which then has to keep track of every connection and what resources it needs. Depending on the hardware (not specified further), this can mean a few thousand (e.g. with »WLAN router off the shelf«, see previous post) to many more simultaneous connections.

    Last post modified: 9/8/2015 22:46:03 by hackyourlife
  • thanks
    That's great.
    The point is that many autonomously working devices are connected to a main computer via WLAN. If an event happens on a device, it should report this to the main computer and then receive new commands, it can also receive new commands in between.
    If I got it right, it works as a router and not as a NAT.
  • atp wrote:
    If I understood it correctly, it works as a router and not as a NAT.
    Since you probably don't have different subnets etc., it then works neither as a router nor as a NAT, but simply as an access point. And then the only limitation is the number of devices that can connect to it via WiFi, which - as I said - depends heavily on the price.

    I tested it a while ago and it came out: with a laptop WLAN card, I got about 10 simultaneous users before they gave up, while with an ancient, simple D-Link access point it was already about 20 .

    How many devices do you want to connect at the same time? And why especially via WLAN? Because it is said that e.g. Ethernet with PoE has the advantage that devices connected to it do not need an extra power supply ... and then there is still the question: why WLAN? Other radio methods can be much more energy efficient if these devices are battery operated.

    Last post modified: 9.9.2015 10:02:26 by hackyourlife
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