2 ms·

> everything wraps wpa_supplicant in the end What should I be reading to understand exactly how the pieces fit together? I'm on Kubuntu, and have been sufferi

> everything wraps wpa_supplicant in the end What should I be reading to understand exactly how the pieces fit together? I'm on Kubuntu, and have been suffering wifi disconnects for years across multiple computers with multiple USB wifi dongles and multiple access points. Literally not a bit of hardware shared, not even the access points. I suspect that Kubuntu shuts down USB wifi dongles after a period of time, as the only reliable way to get back online is to simply disconnect then reconnect the USB dongle. I forget what dmesg says (on mobile now) but it's something to the effect of a voluntary disconnect.

usr1106 2y ago
We had disconnects in our office (so very different machines, different Linux distros and a Mac at least). Don't remember for sure, I believe the message was reauthentication successful and after that connection was lost. The AP runs OpenWrt. We worked around it by changing the reauthentication interval to 8 hours. Those working longer have to deal with it... Yeah, it's probably a weaker security now...
mkl 2y ago
I've never had that problem on Kubuntu, so it's not a general Kubuntu issue. Multiple different access points, but just one PCIe wireless adapter (identified as "Qualcomm Atheros AR93xx Wireless Network Adapter").
- dotancohen 2y ago
  Is that adapter on the motherboard, PCI, or Usb? I'm starting to suspect that the problem is with the USB connection.
  - mkl 2y ago
    It's a PCIe card. Bought in 2016, seems to be this: https://www.tp-link.com/us/home-networking/pci-adapter/tl-wdn4800/ https://www.tp-link.com/us/home-networking/pci-adapter/tl-wd...
    - dotancohen 2y ago
      Perfect, thank you.
crabbone 2y ago
> wifi disconnects This is more likely to be a driver issue than management issue. I think, this was posted to HN before, but I cannot find the article right now, but the gist of it is: both WiFi h/w vendors and Linux driver authors are to blame for the dismal state of events. On the h/w vendor side everything as per usual: no drivers, or broken drivers, incorrect product labeling or self-identification, false or imprecise advertisement of available features. On Linux side: slow inclusion of community-provided drivers for various WiFi modems, no real effort at cataloging and unification / systematization of available drivers. My experience so far is this: Intel h/w is the one that has best Linux support. So, if you are on Realtec or Mediatec, you are getting the short end of the stick. Another universal problem: WiFi protocol keeps iterating at a relatively high speed. Which means that you are often in a situation where either your modem or your router don't speak the same protocol at a good level, and the middle-ground that they find is not well-supported or, sometimes will only be found after lengthy unsuccessful attempts by both sides to do the handshake. This is often also exacerbated by the management software which may misidentify these "handshake problems" and "solve" them by restarting something in the network stack, essentially sending you into an infinite loop of trying to connect. In my unfortunate case with my latest PC build, I had to swap three WiFi modems before I found one that worked satisfactory with the router I have. So, if you have some extra $ to throw at your problem: maybe try getting another WiFi modem?
- dotancohen 2y ago
  Thanks, I'll try to find a good USB or PCI Intel wifi modem. Good idea.
dotancohen 2y ago
W Linux Supported Hardware W Linux Solving problems

usr1106 2y ago

We had disconnects in our office (so very different machines, different Linux distros and a Mac at least). Don't remember for sure, I believe the message was reauthentication successful and after that connection was lost. The AP runs OpenWrt. We worked around it by changing the reauthentication interval to 8 hours. Those working longer have to deal with it... Yeah, it's probably a weaker security now...

mkl 2y ago

I've never had that problem on Kubuntu, so it's not a general Kubuntu issue. Multiple different access points, but just one PCIe wireless adapter (identified as "Qualcomm Atheros AR93xx Wireless Network Adapter").

dotancohen 2y ago
Is that adapter on the motherboard, PCI, or Usb? I'm starting to suspect that the problem is with the USB connection.
- mkl 2y ago
  It's a PCIe card. Bought in 2016, seems to be this: https://www.tp-link.com/us/home-networking/pci-adapter/tl-wdn4800/ https://www.tp-link.com/us/home-networking/pci-adapter/tl-wd...
  - dotancohen 2y ago
    Perfect, thank you.

crabbone 2y ago

> wifi disconnects This is more likely to be a driver issue than management issue. I think, this was posted to HN before, but I cannot find the article right now, but the gist of it is: both WiFi h/w vendors and Linux driver authors are to blame for the dismal state of events. On the h/w vendor side everything as per usual: no drivers, or broken drivers, incorrect product labeling or self-identification, false or imprecise advertisement of available features. On Linux side: slow inclusion of community-provided drivers for various WiFi modems, no real effort at cataloging and unification / systematization of available drivers. My experience so far is this: Intel h/w is the one that has best Linux support. So, if you are on Realtec or Mediatec, you are getting the short end of the stick. Another universal problem: WiFi protocol keeps iterating at a relatively high speed. Which means that you are often in a situation where either your modem or your router don't speak the same protocol at a good level, and the middle-ground that they find is not well-supported or, sometimes will only be found after lengthy unsuccessful attempts by both sides to do the handshake. This is often also exacerbated by the management software which may misidentify these "handshake problems" and "solve" them by restarting something in the network stack, essentially sending you into an infinite loop of trying to connect. In my unfortunate case with my latest PC build, I had to swap three WiFi modems before I found one that worked satisfactory with the router I have. So, if you have some extra $ to throw at your problem: maybe try getting another WiFi modem?

dotancohen 2y ago
Thanks, I'll try to find a good USB or PCI Intel wifi modem. Good idea.

dotancohen 2y ago

W Linux Supported Hardware W Linux Solving problems