Re: FreeBSD laptop not getting IPv6 configured with SLAAC

From: Felix Reichenberger <felix.reichenberger_at_tuta.io>
Date: Wed, 13 Dec 2023 20:06:42 UTC 

> Hello,
>
> I am trying to get my laptop to receive an IPv6 address using SLAAC on my local network. I suspect that the router provided by my ISP is doing something slightly wrong or I may just have configured it wrong.
>
> I am running FreeBSD 14.0-RELEASE-p3.
>
> The network interface looks like this when queried with ifconfig.
>
> wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>     options=0
>     ether 18:1d:ea:b1:f9:8b
>     inet 192.168.0.129 netmask 0xffffff00 broadcast 192.168.0.255
>     inet6 fe80::1a1d:eaff:feb1:f98b%wlan0 prefixlen 64 scopeid 0x2
>     groups: wlan
>     ssid ARRIS-8030 channel 6 (2437 MHz 11g) bssid e4:f7:5b:25:ff:da
>     regdomain FCC country US authmode WPA2/802.11i privacy ON
>     deftxkey UNDEF AES-CCM 2:128-bit txpower 30 bmiss 10 scanvalid 60
>     protmode CTS wme roaming MANUAL
>     parent interface: iwm0
>     media: IEEE 802.11 Wireless Ethernet OFDM/54Mbps mode 11g
>     status: associated
>     nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
>
> I have attached my rc.conf and pf.conf files to this mail.
>
> I have also attached a tcpdump showing router solicitations going out and router advertisements being received.
>
> My pf.conf should be open enough for this to work but for completeness I have also tried with pf disabled with the same result.
>
> When running Ubuntu on the same laptop or even in a Virtualbox VM with bridged networking, Ubuntu manages to configure IPv6 without problems. Likewise with a Windows VM.
>
> I appreciate if anyone here can spot what goes wrong and suggest if I need to configure something differently or whether a code fix will be needed to support this network. I can try patches if necessary.
>
> Thanks.
>
> Best regards
> Kristian
>

Hello Kristian,

I would recommend disabling your pf firewall during testing, and enabling it
after you get SLAAC working. Having multiple unknowns in the equation will
only make your life harder.

In your rc.conf, you could try adding the following line:

ifconfig_wlan0_ipv6="inet6 accept_rtadv"

After adding it, I would also recommend to restart your device.
I use this for all my jails and it works fine with no additional configuration.

Regards.