disabling inet6 on interface wlan0

[Matthias Apitz]

Hello,

I want to have only inet4 on my WLAN interface and have in
/etc/rc.conf concerning the interface:

wlans_ath0="wlan0"
ifconfig_wlan0="WPA SYNCDHCP"
ip6addrctl_enable="NO"
ipv6_network_interfaces="none"
ipv6_activate_all_interfaces="NO"
ifconfig_wlan0_ipv6="NO"

but the interface comes up as:

# ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=0
ether 9c:d2:1e:85:72:79
inet 192.168.178.22 netmask 0xffffff00 broadcast 192.168.178.255
inet6 fe80::9ed2:1eff:fe85:7279%wlan0 prefixlen 64 scopeid 0x2
inet6 2001:a61:341e:eb01:9ed2:1eff:fe85:7279 prefixlen 64 autoconf pltime 3099 vltime 6699
inet6 fd6e:81fe:73cc:0:9ed2:1eff:fe85:7279 prefixlen 64 autoconf pltime 3600 vltime 7200
groups: wlan
ssid tarara channel 36 (5180 MHz 11a ht/40+) bssid 3c:a6:2f:02:c2:d5
regdomain 108 indoor ecm authmode WPA2/802.11i privacy ON
deftxkey UNDEF AES-CCM 2:128-bit AES-CCM 3:128-bit txpower 30 bmiss 7
mcastrate 6 mgmtrate 6 scanvalid 60 ampdulimit 64k shortgi -uapsd wme
burst roaming MANUAL
parent interface: ath0
media: IEEE 802.11 Wireless Ethernet MCS mode 11na
status: associated
nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>

How can I disable inet6 completely or at least temporary?

Thanks

matthias

--
Matthias Apitz, ✉ gu...@unixarea.de, http://www.unixarea.de/ +49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub

[Kurt Hackenberg]

On 2026/02/19 03:47, Matthias Apitz wrote:

> I want to have only inet4 on my WLAN interface and have in
> /etc/rc.conf concerning the interface:
>
> wlans_ath0="wlan0"
> ifconfig_wlan0="WPA SYNCDHCP"
> ip6addrctl_enable="NO"
> ipv6_network_interfaces="none"
> ipv6_activate_all_interfaces="NO"
> ifconfig_wlan0_ipv6="NO"
>

> but the interface comes up [with IPv6]
...

> How can I disable inet6 completely or at least temporary?

Have you looked at /etc/defaults/rc.conf? Search for "ipv6" and "ip6".
Also, there's some information in the Handbook, mixed in with other
networking information -- for example, in section 7.3.

[Jin Guojun[VFF]]

On 2/19/26 00:47, Matthias Apitz wrote:
> Hello,
>
> I want to have only inet4 on my WLAN interface and have in
> /etc/rc.conf concerning the interface:
>
> wlans_ath0="wlan0"
> ifconfig_wlan0="WPA SYNCDHCP"
> ip6addrctl_enable="NO"
> ipv6_network_interfaces="none"
> ipv6_activate_all_interfaces="NO"
> ifconfig_wlan0_ipv6="NO"
>
> but the interface comes up as:

remove or comment out the last line

# ifconfig_wlan0_ipv6="NO"