Let's run through them, maneuvering between the rakes. The WEP (Wired Equivalent Privacy) security method you can use only if you want to give the neighborhood boys a real chance to try their hand at hacking wireless networks. If they are talented, they can do it in a matter of minutes. If they are really lazy, they can do it in a day, with a lunch break. I think that this version of network security today does not suit 99.99999% of users, except for those rare geeks who write comments putting off the Primer.
which wifi preamble type is best
Hello all! Today in this article we are going to chat about one very interesting topic, namely about the type of WiFi preamble in the router settings, and which of the options is better to choose: long or short. Let me tell you right away that I came across this setting in the old Zyxel Keenetic firmware.
I also know that it can be found in old Internet centers by D-Link. As it turned out, almost nowhere is there a clear answer as to why this function is needed. So I read a couple of articles and put all the information together. There may be some mistakes, so if you know better and understand more than I do, I will always be happy to read a more detailed version from you in the comments.
What is it?
Preamble (or "Preamble" in English) is needed to connect two devices over a wireless network. For example, we have a router and a second device a laptop. To keep the laptop on the network at all times, certain packets are sent periodically. When the laptop requests the router, in addition to a certain packet of information, a checksum or CRC (Cyclic Redundancy Check) is also sent.
If the checksum is correct, then the packet has completely reached the address in the correct form. As you know Wi-Fi is a wireless technology which transmits data via radio waves. And, of course, these radio waves themselves can be affected by similar ones – from cellular service, from the neighbor's routers, or from the microwave oven. This is what the checksum is for in order to receive packets without errors.
The preamble acts on the physical PLCP layer – this layer determines the transmission and reception of data packets. Also the preamble refers to one of the PDU data blocks which is sent with the whole packet and has exactly the same checksum.
And now let's talk about dimensions, namely short and long preamble. As I understand it, they differ in the size of the checksum block. The long one has 128 bits, and the short one has 56 bits. As a result, the transmission of the short version is a bit faster: 192 µs compared to 96 µs.
Further it's simple, if the preamble is short the packets are sent a bit faster, which can reduce the ping and the response with the destination server. In fact it can help very well in online gaming, as the ping can be reduced by 5-10 ms. On the other hand, I would still use a simple cable connection – it's more reliable. But that's not always possible – I get it.
The wireless network is not working at all.
The first thing you should do is check to see if the access point is turned on. It happens that children or pets can easily touch the access point's power cord – understandably, without power it will not work.
If the power is on but the WLAN LED is not lit, try turning the access point off and then turning it back on after a while (one minute is enough).
If the WLAN LED is green (which means the wireless part is working as intended) and the WAN (or DSL – it may be called by different names) LED is not lit, then you have a DSL connection problem. Try turning the access point off, waiting a while, and then turning it back on. But wait not a minute, but five minutes, so that the ISP authentication server has time to close the session. Then turn the access point back on. If that doesn't help, call your ISP – the cause is probably on their end.
Wireless network is slow
Either interference or high access point utilization is the reason for slow network performance. Turn off all wireless clients, leave only one node and check the speed. If the speed is normal, then the performance degradation is due to overloading of the access point. You should probably implement another access point, since one is not doing the job anymore. When deploying multiple access points, remember that each access point must operate on its own channel. If you have two access points, use channels 1 and 6 or 6 and 11 (if channel 1 is occupied by another network). If you have three access points, the best scheme is: 1, 6 and 11 (distance is 5 channels between access points). For four access points, a scheme is suitable: 1, 5, 9 and 13 (the distance is 4 channels between the access points). Each access point must work on its own channel, but all access points must have the same SSID, otherwise each access point will be perceived as a separate network.
If the speed remains slow, then interference is probably the problem. How to deal with it was mentioned above.
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