Network unreachable, stuck on 169.254

MucaP

12/16/22, 9:44 PM

I changes ISPs yesterday and every device seems to function normally, except for my Ubuntu computer. The router is dual-band (2.4 and 5ghz), but the access points have different names.

When I connect to either access point, I'm online for a few seconds until most websites (some exceptions: Google, part of Outlook) become unreachable (ERR_ADDRESS_UNREACHABLE on Chrome).

The wireless adpater is a QCA6174 8012.11ac from Qualcomm Atheros.

I noticed that sometimes I'm stuck with a 169.254.. IP. In my router's settings, the device is listed without a hostname (the MAC address and the 169.* IP are reported, though):

When I'm connected to the network (right when I do it):

$ hostname -I                          
192.168.0.150 192.168.0.1 2804:14d:4c87:8b07::1001 2804:14d:4c87:8b07:a192:e43:8fd5:c00b 2804:14d:4c87:8b07:81c1:ba22:ae98:eb51 
 
$ iwconfig
lo        no wireless extensions.
 
docker0   no wireless extensions.
 
wlp2s0    IEEE 802.11  ESSID:"MYSSID5"  
          Mode:Managed  Frequency:5.58 GHz  Access Point: C8:5D:38:F2:39:3F   
          Bit Rate=6 Mb/s   Tx-Power=24 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=70/70  Signal level=-28 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:79   Missed beacon:0
 
enp1s0    no wireless extensions.
 
veth9ebe7db  no wireless extensions.

When sites become unreachable:

$ hostname -I     
192.168.0.1 2804:14d:4c87:8b07::1001 2804:14d:4c87:8b07:a192:e43:8fd5:c00b 2804:14d:4c87:8b07:81c1:ba22:ae98:eb51

When I'm not connected to any network:

$ hostname -I
192.168.0.1 

$ iwconfig   
lo        no wireless extensions.
 
docker0   no wireless extensions.
 
wlp2s0    IEEE 802.11  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=off   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
 
enp1s0    no wireless extensions.
 
veth9ebe7db  no wireless extensions.

0 + 1

wireless

networking

dhcp

20.04

waltinator

12/17/22, 1:23 PM

Look at the logs! `sudo journalctl -b 0 -u NetworkManager`. Read `man journalctl`.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Network unreachable, stuck on 169.254

TH: เข้าเครือข่ายไม่ได้ ติดอยู่ที่ 169.254

RO: Rețeaua inaccesabilă, blocată pe 169.254

RU: Сеть недоступна, застрял на 169.254

VI: Mạng không truy cập được, bị kẹt trên 169.254

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