ifconfig greX create disables IPv6 forwarding

[Daniel Corbe]

Paul Thornton <prt at prt.org> writes:

> On 09/02/2015 16:34, Daniel Corbe wrote:
>>
>> For some reason, every time I create a GRE interface on a FreeBSD IPv6
>> gateway, net.inet6.ip6.forwarding is disabled.  As long as I manually
>> re-enable it with sysctl, both the GRE tunnel and the IPv6 network
>> behind this machine will continue to work; however, it's certainly far
>> from ideal.
> I stumbled acro
>
> I discovered this in January.  See this thread:
>
> http://lists.freebsd.org/pipermail/freebsd-net/2015-January/040797.html
>
> Are you enabling forwarding using ipv6_gateway_enable in rc.conf, or
> are you just setting net.inet6.ip6.forwarding to 1 in sysctl.conf?
>
> devd gets involved running /etc/rc.d/netif start and that seems to
> check (and set) the forwarding sysctls based on the rc.conf entries -
> so if you've set them "manually" they get reset when a new interface
> is brought up.
>
> Adding ipv6_gateway_enable="YES" in /etc/rc.conf should fix this.
>

Embarrassingly enough, the problem wound up being I had
ipv6_enable_gateway instead of ipv6_gateway_enable.  I'm also setting
net.inet6.ip6.forwarding=1 manually in sysctl.conf so that's sort of
why it ever worked to begin with.

Thanks though.  Some times all you need is a second set of eyes on a
problem.

-Daniel