IPv6

Disabilitazione

GNU/Linux

Id

Reference

Licenza

1

https://askubuntu.com/a/309463

CC BY-SA 4.0 1

2

https://wiki.archlinux.org/title/IPv6#Disable_IPv6

GNU Free Documentation License 1.3 or later 2

Run as user

root

  1. append these lines to the Sysctl configuration file

    /etc/sysctl.conf
    1net.ipv6.conf.lo.disable_ipv6 = 1
    2net.ipv6.conf.all.disable_ipv6 = 1
    3net.ipv6.conf.default.disable_ipv6 = 1
    
  2. reload the configuration

    sysctl -p /etc/sysctl.conf
    
  3. comment IPv6 hosts in /etc/hosts

  4. reboot and check that everything still works

Avvertimento

Disabling IPv6 on a server is not without dangers! See reference 2. Remember to disable IPv6 from server configurations such as OpenSSH and Unbound, for example.

/etc/ssh/sshd_config
1# [ ... ]
2AddressFamily inet
3ListenAddress 0.0.0.0
4# [ ... ]

OpenWRT

Id

Reference

Licenza

3

https://discourse.pi-hole.net/t/be-aware-of-androids-shady-ipv6-dns/36636

unknown

4

https://forum.openwrt.org/t/solved-how-can-i-completely-disable-ipv6-from-luci/31456/4

unknown

You may want to disable IPv6 on OpenWrt because of DNS issues with recent Android OSes. Android uses the IPv6 DNSes advertised by an OpenWRT router even if you set a static IPv4 DNS.

  1. login the LuCI web UI

  2. append this content to System -> Startup -> Local Startup before the exit 0 command

    sysctl -w net.ipv6.conf.all.disable_ipv6=1
    sysctl -w net.ipv6.conf.default.disable_ipv6=1
    

    Nota

    The net.ipv6.conf.lo.disable_ipv6=1 option does not seem to have any effect on the loopback interface.

  3. reboot

Footnotes

1

Copyright (c) 2013, 2018 Eric Carvalho, abu_bua (at askubuntu.com)

2

Copyright (c) ArchWiki contributors