Is it possible to dc someones internet without WLAN running

I’m using a FRITZ!Box Router (with updated OS) and behind the NAT there are only devices via wired LAN connected. Actually there is only one device connected! It’s my notebook with a renewed HDD and reinstalled OS (linux).

I would like to know if it could be possible to force a disconnect from outside of my subnet. My notebook’s WLAN adapter was activated, but not connected. WLAN on my router is turned off due to abnormal behaviour in past. A few years back there were no problem. Since 1 year I got that weird stranger in my neighborhood, who stalks me and the disconnections conspicuously increased. Since I switched to wired LAN no unexpected dc noticed anymore…

I’m unexperienced and don’t know much about the possible attacks on routers or connected computers. I’m actually still learning much about web security (according to smartphones and pcs) and maybe we talk about bad coincidences, but I would like to know, if it could be possible, that attackers were able to compromise my home net or still could use possibly weak points like activated wifi adapters from notebooks to hoax me with disconnections or possibly more like spying activities.

no connection with Broadcom BCM4311 802.11b/g WLAN wireless card

Since I installed Lubuntu 18.04.3 recently (on a Lenovo 3000 N-100 notebook) I have no wireless connection. I’ve read several previous AskUbuntu questions. Regarding the first answer to the AskUbuntu question at https://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers, I believe I followed the section titled Installing The Package (Online). There is still no wireless connection. Here is a current screenshot of the system tool Software and Updates. enter image description here

If you can help with suggestions, please make them clear and complete, step-by-step, without unnecessary assumptions/jargon/etc as I’m relatively new to Linux, and my awareness of system architecture and software is quite limited. Thank you.

Capturing multicast packets in WLAN

(I had to move this from Network Engineering stack exchange where I origianlly asked this question)

If a device in monitoring mode snoops on the traffic in a WLAN, can it CAPTURE and READ multicast packets?

For instance, if a device broadcasting packets to multicast address 239.255.255.250, can a monitoring device capture and read those packets?

wlan off when turning on computer

sometimes when I turn on my laptop its on flight mode, when I turn off flight mode Bluetooth is turned on. ifconfig says device not found, i.e I cant connect to the internet. if I restart the computer it solves the problem. I am very curious about why this is happening and especially why it only happens approximately 1 out of 10 times. How can I find out?

Thanks!

Access router from guest WLAN as if from outside

I configured RouterOS on RB2011UiAS-2HnD-IN‎ to have 2 WLANs: the primary, as a LAN interface, and the guest WLAN, with isolation using firewall drop rule. Guest WLAN can access Internet, but not the LAN. Now, I have a Jabber server in the network. All the NAT rules are set up so that it is accessible from outside + a hairpin NAT rule to access it from LAN. Everything is working fine until I attempt to connect a guest net device to Jabber. My logic is so that if a device can access the Internet, it should also be able to access the router as if from outside. How to achieve this?

TP-Link Archer T2U V2 can not connect to WLAN on Ubuntu 19.04

I’m trying to connect to my home wifi. Plasma indicates that a connection is being established (rotating circle), and then fails to connect.

uname -a:

Linux hostname 5.0.0-15-generic #16-Ubuntu SMP Mon May 6 17:41:33 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux 

dmesg:

[   24.328693] usb 2-1.2: new high-speed USB device number 3 using ehci-pci [   24.462471] usb 2-1.2: New USB device found, idVendor=148f, idProduct=761a, bcdDevice= 1.00 [   24.462476] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [   24.462479] usb 2-1.2: Product: WiFi [   24.462482] usb 2-1.2: Manufacturer: MediaTek [   24.462484] usb 2-1.2: SerialNumber: 1.0 [   25.009613] cfg80211: Loading compiled-in X.509 certificates for regulatory database [   25.015016] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' [   25.128668] usb 2-1.2: reset high-speed USB device number 3 using ehci-pci [   25.247582] mt76x0u 2-1.2:1.0: ASIC revision: 76100002 MAC revision: 76502000 [   26.654170] mt76x0u 2-1.2:1.0: EEPROM ver:02 fae:01 [   27.230757] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' [   27.231175] usbcore: registered new interface driver mt76x0u [   27.243913] mt76x0u 2-1.2:1.0 wlx503eaab994d1: renamed from wlan0 [   35.404273] wlx503eaab994d1: authenticate with f4:06:8d:c9:3b:24 [   35.855337] wlx503eaab994d1: send auth to f4:06:8d:c9:3b:24 (try 1/3) [   35.857284] wlx503eaab994d1: authenticated [   40.993891] wlx503eaab994d1: authenticate with e0:28:6d:3d:54:5c [   41.423843] wlx503eaab994d1: send auth to e0:28:6d:3d:54:5c (try 1/3) [   41.430296] wlx503eaab994d1: authenticated [   51.274859] wlx503eaab994d1: authenticate with f4:06:8d:c9:3b:24 [   52.180228] wlx503eaab994d1: send auth to f4:06:8d:c9:3b:24 (try 1/3) [   52.186147] wlx503eaab994d1: authenticated [   58.217434] wlx503eaab994d1: authenticate with e0:28:6d:3d:54:5c [   58.672672] wlx503eaab994d1: send auth to e0:28:6d:3d:54:5c (try 1/3) [   58.796502] wlx503eaab994d1: send auth to e0:28:6d:3d:54:5c (try 2/3) [   58.802071] wlx503eaab994d1: authenticated [   68.127196] wlx503eaab994d1: authenticate with f4:06:8d:c9:3b:24 [   68.559101] wlx503eaab994d1: send auth to f4:06:8d:c9:3b:24 (try 1/3) [   68.562722] wlx503eaab994d1: authenticated [   69.520564] mt76x0u 2-1.2:1.0: rx urb failed: -71 [   69.525171] mt76x0u 2-1.2:1.0: rx urb failed: -71 [   69.530077] mt76x0u 2-1.2:1.0: rx urb failed: -71 (same message repeated ~40 times) [   69.759192] mt76x0u 2-1.2:1.0: rx urb failed: -71 [   69.763706] mt76x0u 2-1.2:1.0: rx urb failed: -71 [   69.764546] mt76x0u 2-1.2:1.0: vendor request req:07 off:1134 failed:-71 [   69.768568] mt76x0u 2-1.2:1.0: rx urb failed: -71 [   69.770807] usb 2-1.2: USB disconnect, device number 3 [   69.779197] mt76x0u 2-1.2:1.0: mac specific condition occurred 

not able to see the devices connected to my home WLAN network

I ve tried on my laptop the utility advanced port scanner, I ve tried on my android phone the utility fing. Both utilities only show the computer, on which they are running, and the network router dv2210. But not the other computers in the home network. Why?

I ve tried this advice:

https://forums.tomshardware.com/threads/devices-on-wireless-network-cant-detect-interact-with-each-other.2131151/

but on my router this AP Isolation is off

What could be the problem?

Publish same WLAN SSID on independent sites

(I first posted this here, but it was suggested to be more on topic here)

I want to run the “same” WLAN in two independent sites (in different cities) in such a way that a user once connected to the WLAN in City A can easily connect in City B as well. As it turned out, just using the same SSID FOOBAR won’t work. For example, in Windows boxes, you have to remove the known FOOBAR and then search again for available WLANs – aparently, the FOOBAR “here” is somehow different from the FOOBAR “there”. In a way, it is understandable that just publishing the same SSID name should not be sufficient – after all anybody could just setup popular SSIDs, have walk-by clients attempt to automatically login with their credentials, and collect the data.

While both sites have their own WiFi management (a Sophos UTM), in the background all essentialities should be the same: Authentication is via a common RADIUS server (connected to both sites via tunnel) and therupon by MSCHAP via a common Windows AD server. So my question is: What else that must be kept in sync between my two cities in order to make the WLANs the “same” in a manner sufficient to allow automated connect to the second site the same way one re-connects to the first site? Is it some kind of private key or shared secret perhaps? In another forum, they suggested using the same DNS server IPs in both sites, but this appeared not to work for me. (However, one thing I cannot make the same in both sites is the IP range)

In case the answer depends on the type of clients, I am primarily interested in Windows 10 systems, but also iPhone/Android smartphones.