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txomon

Member

Registered: 2015-10-21

Posts: 3

WiFi only works in promiscuous mode after connecting with NM

This is a really weird one, and I am still puzzled by the discovery.

I have the following nmconnection:

[connection]
id=edited
uuid=8ab9f013-ab9b-4222-b7c2-dee4f673334d
type=wifi
permissions=
timestamp=1553782623

[wifi]
mac-address=wifi-card-mac
mac-address-blacklist=
mode=infrastructure
seen-bssids=edited-mac;
ssid=edited

[wifi-security]
key-mgmt=wpa-psk
psk=password

[ipv4]
dns-search=
method=auto

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto

when connecting, pinging anything won't work (all packets dropped, with no reply), browsing won't work, resolving won't work.

However, if I start wireshark, and start capturing packets, the moment the promiscuous mode is setup by wireshark, everything will start working.

I'm looking with iw trying to see where the problem may lay, anyone has any tip?

txomon

Member

Registered: 2015-10-21

Posts: 3

Re: WiFi only works in promiscuous mode after connecting with NM

My laptop is a Dell XPS 13 9350, and I have linked the problem to rebooting instead of poweroff-poweron. I have no idea what causes it though

nimrod_mack

Member

Registered: 2018-11-29

Posts: 15

Re: WiFi only works in promiscuous mode after connecting with NM

Funnily enough, I have the same laptop and the same problem! Although I don't restart my computer, it still happens... (but then, it has this weird thing of not showing anything but the power light and hanging indefinitely when I press the power butten first, and only boot normally after I turn it off and on again by pressing the power button once and once more...)

As a workaround, I use ip link set dev wlan0 promisc on and that works without having to open wireshark all the time...