And what about ipv6_defaultrouter?
hrs at FreeBSD.org
Fri Jun 10 20:39:52 UTC 2016
Niklaas Baudet von Gersdorff <stdin at niklaas.eu> wrote
in <20160610191828.GE2817 at box-hlm-03.niklaas.eu>:
st> Hiroki Sato [2016-06-10 22:50 +0900] :
st> > A router does not accept RAs (more strictly, default route
st> > information in RA) because it is a sender of RAs. However, some
st> > devices such as CPE need to behave like a host for the uplink and a
st> > router for the LAN. In that case, an interface on the WAN side has
st> > to accept RAs and one on the LAN side has to send RAs.
st> > On FreeBSD, there is a knob to support it. Set the following
st> > variable to rc.conf in addition to your current configuration:
st> > ipv6_cpe_wanif="vtnet0"
st> Thanks a lot for pointing that out! I think I read about the variable
st> somewhere but I was not sure what it actually does. Is there some place
st> where I can find more detailed explanation about rc.conf and sysctl
st> settings except man?
Unfortunately there is no documentation other than manual page
because this is a bit tricky. rc.conf(5) explains as follows:
(str) If the variable is set to an interface name, the
ifconfig(8) options ``inet6 -no_radr accept_rtadv'' will be
added to the specified interface automatically before evalu-
ating ifconfig_<interface>_ipv6, and two sysctl(8) variables
net.inet6.ip6.rfc6204w3 and net.inet6.ip6.no_radr will be set to
This means the specified interface will accept ICMPv6 Router
Advertisement messages on that link and add the discovered
routers into the Default Router List. While the other inter-
faces can still accept RA messages if the ``inet6 accept_rtadv''
option is specified, adding routes into the Default Router List
will be disabled by ``inet6 no_radr'' option by default. See
ifconfig(8) for more details.
Note that ICMPv6 Router Advertisement messages will be accepted
even when net.inet6.ip6.forwarding is 1 (packet forwarding is
enabled) when net.inet6.ip6.rfc6204w3 is set to 1.
Default is ``NO''.
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