ipv6 address keeps changing

ackerleytng · 2021-08-17 04:47:41

My laptop's ipv6 address keeps changing, between something like

2601:603:f7f:b234::7f1/128

and something like

2601:603:f7f:b234:d63b:4ff:fe7b:363/64

If i do a [inline]watch -n1 ip addr show[/inline], I see these two lines appearing and disappearing once in a while

    inet6 2601:603:f7f:b234:d63b:4ff:fe7b:363/64 scope global dynamic mngtmpaddr noprefixroute
       valid_lft 240291sec preferred_lft 240291sec

This is causing chrome to keep displaying [inline]err_network_changed[/inline] once in a while. How do I start debugging this and what might the cause be?

seth · 2021-08-17 05:51:39

You disconnect from the network and lose the IP, why that is cannot be said from the IP.
A common reason is that you're running competing network managing services, output of

find /etc/systemd -type l -exec test -f {} \; -print | awk -F'/' '{ printf ("%-40s | %s\n", $(NF-0), $(NF-1)) }' | sort -f

?

If that's not it, we'll likely have to see the system journal (sudo journalctl -b)
Could be because of NM scanning the network and https://wiki.archlinux.org/title/Networ … domization - but that's completely baseless speculation at this point.

ackerleytng · 2021-08-17 05:59:55

Here's the output! How do I read this?

$ find /etc/systemd -type l -exec test -f {} \; -print | awk -F'/' '{ printf ("%-40s | %s\n", $(NF-0), $(NF-1)) }' | sort -f

dbus-org.freedesktop.network1.service    | system
dbus-org.freedesktop.resolve1.service    | system
dirmngr.socket                           | sockets.target.wants
getty@tty1.service                       | getty.target.wants
gpg-agent-browser.socket                 | sockets.target.wants
gpg-agent-extra.socket                   | sockets.target.wants
gpg-agent.socket                         | sockets.target.wants
gpg-agent-ssh.socket                     | sockets.target.wants
lenovo_fix.service                       | multi-user.target.wants
p11-kit-server.socket                    | sockets.target.wants
pulseaudio.socket                        | sockets.target.wants
remote-fs.target                         | multi-user.target.wants
systemd-networkd.service                 | multi-user.target.wants
systemd-networkd.socket                  | sockets.target.wants
systemd-resolved.service                 | multi-user.target.wants
tlp.service                              | multi-user.target.wants
wpa_supplicant@wlp2s0.service            | multi-user.target.wants
$

seth · 2021-08-17 06:13:13

You're using only systemd-networkd and wpa_supplicant (which will likely be the required carrier service since systemd-network doesn't establish wireless carriers itself)
To be sure: what is "lenovo_fix"?

tlp might be an issue (ie. your wifi chip takes a nap and loses the connection)

There's no obvious issue w/ your services, so let's have a look at the journal.

ackerleytng · 2021-08-17 06:36:14

I'm using throttled (lenovo_fix) according to https://wiki.archlinux.org/title/Lenovo … ing_issues

Here's the last 512 lines of journalctl -b: http://ix.io/3weV

Thank you!

seth · 2021-08-17 07:06:44

Seems the network environment, this is probably not a bug on your system

Aug 16 23:17:07 ackerleytng-x1c6 kernel: wlp2s0: deauthenticated from 98:da:c4:83:1b:e4 (Reason: 5=DISASSOC_AP_BUSY)
Aug 16 23:17:07 ackerleytng-x1c6 systemd-networkd[252]: wlp2s0: DHCP lease lost
Aug 16 23:17:07 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-DISCONNECTED bssid=98:da:c4:83:1b:e4 reason=5

You get kicked from the 5GHz "A&W" AP…

Aug 16 23:17:09 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-CONNECTED - Connection to 98:da:c4:83:1b:e5 completed [id=0 id_str=]

And connect to the 2.4GHz "A&W" AP…

Aug 16 23:17:17 ackerleytng-x1c6 kernel: wlp2s0: deauthenticated from 98:da:c4:83:1b:e5 (Reason: 5=DISASSOC_AP_BUSY)

8 seconds later it also kicks you…

Aug 16 23:17:19 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-AUTH-REJECT 98:da:c4:83:1b:e5 auth_type=0 auth_transaction=2 status_code=17

And tells you to fuck off when you try to re-connect…

Aug 16 23:17:22 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-CONNECTED - Connection to fe:ec:da:82:2e:11 completed [id=8 id_str=]

So you resort to the 5GHz "CityScape Guest" AP…

Aug 16 23:17:37 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-BEACON-LOSS
Aug 16 23:17:37 ackerleytng-x1c6 systemd-networkd[252]: wlp2s0: Lost carrier
Aug 16 23:17:37 ackerleytng-x1c6 systemd-networkd[252]: wlp2s0: DHCP lease lost
Aug 16 23:17:37 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-DISCONNECTED bssid=fe:ec:da:82:2e:11 reason=4 locally_generated=1

But that signal isn't strong enough (I guess - or you moved out of range)…

Aug 16 23:17:37 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-AUTH-REJECT 98:da:c4:83:1b:e5 auth_type=0 auth_transaction=2 status_code=17

So you ask the 2.4GHz "A&W" AP to once more tell you to get lost…

Aug 16 23:17:42 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-CONNECTED - Connection to fe:ec:da:81:2e:11 completed [id=8 id_str=]

So you move over to the 2.4GHz "CityScape Guest" AP…

Aug 16 23:17:55 ackerleytng-x1c6 sudo[95852]: ackerleytng : TTY=pts/7 ; PWD=/home/ackerleytng/downloads ; USER=root ; COMMAND=/usr/bin/systemctl restart wpa_supplicant@wlp2s0.service

You panic and restart wpa_supplicant…

Aug 16 23:17:55 ackerleytng-x1c6 wpa_supplicant[517]: wlp2s0: CTRL-EVENT-DISCONNECTED bssid=fe:ec:da:81:2e:11 reason=3 locally_generated=1

What opts you out of the 2.4GHz "CityScape Guest" AP…

Aug 16 23:17:57 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: SME: Trying to authenticate with 98:da:c4:83:1b:e5 (SSID='A&W' freq=2462 MHz)
Aug 16 23:17:57 ackerleytng-x1c6 kernel: wlp2s0: authenticate with 98:da:c4:83:1b:e5
Aug 16 23:17:57 ackerleytng-x1c6 kernel: wlp2s0: send auth to 98:da:c4:83:1b:e5 (try 1/3)
Aug 16 23:17:57 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: CTRL-EVENT-AUTH-REJECT 98:da:c4:83:1b:e5 auth_type=0 auth_transaction=2 status_code=17

And once more the 2.4GHz "A&W" AP, at this time probably really pissed about the dingus who keeps knocking, tells you to GTFO ;-)

Aug 16 23:18:01 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: SME: Trying to authenticate with 98:da:c4:83:1b:e4 (SSID='A&W' freq=5180 MHz)
Aug 16 23:18:01 ackerleytng-x1c6 kernel: wlp2s0: authenticate with 98:da:c4:83:1b:e4
Aug 16 23:18:01 ackerleytng-x1c6 kernel: wlp2s0: send auth to 98:da:c4:83:1b:e4 (try 1/3)
Aug 16 23:18:01 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: CTRL-EVENT-AUTH-REJECT 98:da:c4:83:1b:e4 auth_type=0 auth_transaction=2 status_code=17
Aug 16 23:18:01 ackerleytng-x1c6 kernel: wlp2s0: 98:da:c4:83:1b:e4 denied authentication (status 17)
Aug 16 23:18:04 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: SME: Trying to authenticate with 98:da:c4:83:1b:e5 (SSID='A&W' freq=2462 MHz)
Aug 16 23:18:04 ackerleytng-x1c6 kernel: wlp2s0: authenticate with 98:da:c4:83:1b:e5
Aug 16 23:18:04 ackerleytng-x1c6 kernel: wlp2s0: send auth to 98:da:c4:83:1b:e5 (try 1/3)
Aug 16 23:18:04 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: CTRL-EVENT-AUTH-REJECT 98:da:c4:83:1b:e5 auth_type=0 auth_transaction=2 status_code=17
Aug 16 23:18:04 ackerleytng-x1c6 kernel: wlp2s0: 98:da:c4:83:1b:e5 denied authentication (status 17)

So you try the 5GHz "A&W" (which I assume at this point fetches the Baseball Bat from the basement) and the 2.4GHz "A&W" AP (which is only left crying) and they tell you that they're not interested in your religion…

Aug 16 23:18:07 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: CTRL-EVENT-CONNECTED - Connection to fe:ec:da:81:2e:11 completed [id=8 id_str=]

So back to the 2.4GHz "CityScape Guest"…

Aug 16 23:18:27 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: SME: Trying to authenticate with 98:da:c4:83:1b:e4 (SSID='A&W' freq=5180 MHz)

Until 10 seconds later you try the sexier 5GHz "A&W" AP again…

Aug 16 23:18:27 ackerleytng-x1c6 wpa_supplicant[95856]: wlp2s0: CTRL-EVENT-CONNECTED - Connection to 98:da:c4:83:1b:e4 completed [id=0 id_str=]

Who perhaps got dropped by her date, but anyway: this time, she lets you in. 3rd base.

So bottom line:
There're 4 APs in your range, the "A&W" APs look better, but are also picky - and I guess you're just not that handsome.
The 5GHz "CityScape Guest" AP is probably too far away - whether the 2.4GHz one would ultimately pan out to be the unsexy but stable relation cannot be told atm (because you keep running from her)

"Networks"…

ackerleytng · 2021-08-17 07:41:11

I'm using an OpenWrt router, any suggestions on how I can start debugging this?

seth · 2021-08-17 08:26:28

"CityScape" sounds like a public hotspot, is "A&W" your private router?
You probably configured some quota or it for some reason runs out of leases and kicks you - you'll have to look at the router logs.

ackerleytng · 2021-08-18 07:37:39

Turns out that my router was sending out the SLAAC flag on IPv6 Router Advertisement (RA) messages, and upon receiving it, my laptop would obtain a new IPv6 address. Repeated obtaining of IPv6 addresses causes this behavior. To fix this, I switched off the "Enable SLAAC" flag in my router's RA settings, and it seems like now the IPv6 addresses are stable.

jpiszcz · 2023-06-13 22:05:10

ackerleytng wrote:

Turns out that my router was sending out the SLAAC flag on IPv6 Router Advertisement (RA) messages, and upon receiving it, my laptop would obtain a new IPv6 address. Repeated obtaining of IPv6 addresses causes this behavior. To fix this, I switched off the "Enable SLAAC" flag in my router's RA settings, and it seems like now the IPv6 addresses are stable.

I was running into the same issue and this solved my problem, thank you!

2ManyDogs · 2023-06-13 22:09:13

Seems to be the day for necrobumps. Please don't do that.

Closing.

Arch Linux

#1 2021-08-17 04:47:41

ipv6 address keeps changing

#2 2021-08-17 05:51:39

Re: ipv6 address keeps changing

#3 2021-08-17 05:59:55

Re: ipv6 address keeps changing

#4 2021-08-17 06:13:13

Re: ipv6 address keeps changing

#5 2021-08-17 06:36:14

Re: ipv6 address keeps changing

#6 2021-08-17 07:06:44

Re: ipv6 address keeps changing

#7 2021-08-17 07:41:11

Re: ipv6 address keeps changing

#8 2021-08-17 08:26:28

Re: ipv6 address keeps changing

#9 2021-08-18 07:37:39

Re: ipv6 address keeps changing

#10 2023-06-13 22:05:10

Re: ipv6 address keeps changing

#11 2023-06-13 22:09:13

Re: ipv6 address keeps changing

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