I tested this on RPi 4

actually  I have same issue on x86_64.

(In reply to Zaoliang Luo from comment #2)
> actually  I have same issue on x86_64.

Are you using yast or sysctl on x86?

Can you list the steps for x86?

(In reply to Santiago Zarate from comment #3)
> (In reply to Zaoliang Luo from comment #2)
> > actually  I have same issue on x86_64.
> 
> Are you using yast or sysctl on x86?
> 
> Can you list the steps for x86?

I use sysctl, same steps as I provided as on RPi.

I spent sometime to compare with sles 15sp5 and current sles 15 snapshot, there is no issue so far.

So this issue happens at moment on Tumbleweed.

Report here

 /sbin/sysctl -a --pattern '^net.ipv6.*.disable_ipv6'

after (re)boot ... beside this systemd uses its own sysctl known as
systemd-sysctl (8) ... therfore the link

  find /usr/lib/sysctl.d/ -type l -ls
  1570460      0 lrwxrwxrwx   1 root     root           24 Jul  4 15:59 /usr/lib/sysctl.d/99-sysctl.conf -> ../../../etc/sysctl.conf

should exist as otherwise /etc/sysctl.conf is ignored by systemd

(In reply to Zaoliang Luo from comment #0)
 
> In the file /etc/sysctl.conf add the following lines:
> 
> net.ipv6.conf.all.disable_ipv6 = 1
> net.ipv6.conf.default.disable_ipv6 = 1
> net.ipv6.conf.lo.disable_ipv6 = 1

Please read the comment in that file before deleting/overwriting it.

/etc/sysctl.conf should not be used on Tumbleweed and SLES15! So nothing new, but common best practice since many, many years.

Please fix your setup, test again and if it is still failing, report here.

checked /usr/lib/sysctl.d/99-sysctl.conf and verified this on Tumbleweed, thanks!

This is weird, it is not working on my Tumbleweed with Network-Manager(wifi).


zaoliang@dell-5320:~> ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 9c:fc:e8:d1:c2:9d brd ff:ff:ff:ff:ff:ff
    altname wlp0s20f3
    inet 192.168.8.128/24 brd 192.168.8.255 scope global dynamic noprefixroute wlo1
       valid_lft 43192sec preferred_lft 43192sec
    inet6 fe80::c72c:3d4:8466:ddf4/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: enp57s0u1u4: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether 70:b5:e8:8c:2c:c6 brd ff:ff:ff:ff:ff:ff
4: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 72:51:a1:17:f8:0c brd ff:ff:ff:ff:ff:ff


zaoliang@dell-5320:~> find /usr/lib/sysctl.d/ -type l -ls
   531891      4 lrwxrwxrwx   1 root     root           24 Oct  9 11:11 /usr/lib/sysctl.d/99-sysctl.conf -> ../../../etc/sysctl.conf



zaoliang@dell-5320:~> cat /usr/lib/sysctl.d/99-sysctl.conf 
####
#
# To disable or override a distribution provided file just place a
# file with the same name in /etc/sysctl.d/
#
# See sysctl.conf(5), sysctl.d(5) and sysctl(8) for more information
#
####
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1


zaoliang@dell-5320:~> cat /etc/os-release 
NAME="openSUSE Tumbleweed"
# VERSION="20231010"
ID="opensuse-tumbleweed"
ID_LIKE="opensuse suse"
VERSION_ID="20231010"
PRETTY_NAME="openSUSE Tumbleweed"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:tumbleweed:20231010"
BUG_REPORT_URL="https://bugzilla.opensuse.org"
SUPPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org"
DOCUMENTATION_URL="https://en.opensuse.org/Portal:Tumbleweed"
LOGO="distributor-logo-Tumbleweed"

please give a comment on https://bugzilla.suse.com/show_bug.cgi?id=1214191#c9

thanks!