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I am looking to create an access point to share the internet of a Ubuntu Desktop box. The copy of Ubuntu was installed with Gnome but X was disabled on startup so it is ssh/cmd only for the most part.

$ lsb_release -a
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.4 LTS
Release:        22.04
Codename:       jammy



$ sudo nmcli device status | grep wifi
wlx347de4403656  wifi      disconnected

Wifi Device Exists and is a USB BrosTrend USB wifi adapter for Linux – AC1L

$ sudo nmcli -f WIFI-PROPERTIES.AP device show wlx347de4403656
WIFI-PROPERTIES.AP:                     yes

Wifi Device Supports AccessPoint mode

So the Wifi Device is there and supports AP mode. So now creating the AP bit.

$ sudo nmcli c add type wifi ifname  wlx347de4403656 con-name hotspot autoconnect yes ssid ouch

Connection 'hotspot' (b176bbf9-8a39-497a-9f74-21a2971af14e) successfully added.



/etc/NetworkManager/system-connections$ ls
 hotspot.nmconnection  'Wired connection 1.nmconnection'

So the nmconnection file is created.

$sudo nmcli connection modify hotspot 802-11-wireless.mode ap 802-11-wireless.band bg ipv4.method shared

This sets the configuration file to AP or access point mode on bands bg sharing via IPv4.

$sudo nmcli connection modify hotspot wifi-sec.key-mgmt wpa-psk

This tells the wifi ap to use WPA-PSK

$sudo nmcli connection modify hotspot wifi-sec.psk "password"

This sets the password for the wifi ap.

/etc/NetworkManager/system-connections$ sudo cat hotspot.nmconnection 
[connection]
id=hotspot
uuid=b176bbf9-8a39-497a-9f74-21a2971af14e
type=wifi
interface-name=wlx347de4403656
timestamp=1717281836

[wifi]
band=bg
mode=ap
ssid=ouch

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

[ipv4]
method=shared

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

[proxy]

Now turned it on:

$ sudo nmcli connection up hotspot 
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)

Now when i search for WiFi i can see an SSID called ouch. On my android phone i see it as Ouch with WPA3(SAE Transition Mode).

If i try to connect i attempts and fails. The same happens if i try to connect via my laptop. I have no feedback as to why.

 $ ss -tulpn | egrep ":53|:67"
udp   UNCONN 0      0                      10.42.0.1:53         0.0.0.0:*          
udp   UNCONN 0      0                  127.0.0.53%lo:53         0.0.0.0:*          
udp   UNCONN 0      0                        0.0.0.0:67         0.0.0.0:*          
udp   UNCONN 0      0                        0.0.0.0:5353       0.0.0.0:*          
udp   UNCONN 0      0                           [::]:53863         [::]:*          
udp   UNCONN 0      0                           [::]:5353          [::]:*          
tcp   LISTEN 0      4096               127.0.0.53%lo:53         0.0.0.0:*          
tcp   LISTEN 0      32                     10.42.0.1:53         0.0.0.0:*

From this i can see that it is looking to offer IP on the default 10.42.0.1 range listening on port 53 (dnsmasq I guess or something similar).

$ sudo nft list ruleset
table ip nm-shared-wlx347de4403656 {
        chain nat_postrouting {
                type nat hook postrouting priority srcnat; policy accept;
                ip saddr 10.42.0.0/24 ip daddr != 10.42.0.0/24 masquerade
        }

        chain filter_forward {
                type filter hook forward priority filter; policy accept;
                ip daddr 10.42.0.0/24 oifname "wlx347de4403656" ct state { established, related } accept
                ip saddr 10.42.0.0/24 iifname "wlx347de4403656" accept
                iifname "wlx347de4403656" oifname "wlx347de4403656" accept
                iifname "wlx347de4403656" reject
                oifname "wlx347de4403656" reject
        }
}

I am no expert in any of this but from what i can see the rules are there for the wifi network card too.

I just don’t know what else to do or check as I simply can not connect to it. Any help appreciated.

OK I tried one last thing … and it now works after this long post so will post anyway in case it helps someone else. The bit that got it working for me was:

$sudo nmcli c modify Hotspot 802-11-wireless-security.pmf 1

This I believe disables “Protected Management Frames”. Thank you to @Dzamo Norton from this post https://askubuntu.com/questions/1424633/unable-to-connect-with-the-hotspot-created-on-ubuntu

If you make any changes to the file hotspot.nmconnection be sure to run the following command or they won’t take effect.

$ sudo systemctl restart NetworkManager

If you find your AP / SSID keeps disappearing it might be that you have IP v6 enabled and it is not supported by the hardware. If so … disable it with:

sudo nmcli connection modify hotspot ipv6.method "disabled"

Didn’t help … try eiiting:

/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

and setting the value to 1 or 0.

The access point keeps disappearing seems to come back when you ssh in and restart NetworkManager but I have no idea why ? Any help would be appreciated.

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Danh mục

nmcli Hotspot keeps disappearing