Date: Mon, 09 Feb 2015 14:43:33 -0500 From: Daniel Corbe <corbe@corbe.net> To: Paul Thornton <prt@prt.org> Cc: freebsd-net@freebsd.org Subject: Re: ifconfig greX create disables IPv6 forwarding Message-ID: <87lhk6j2fu.fsf@corbe.net> In-Reply-To: <54D8E7AC.3080006@prt.org> (Paul Thornton's message of "Mon, 09 Feb 2015 17:00:28 %2B0000") References: <87h9uvjb7p.fsf@corbe.net> <54D8E7AC.3080006@prt.org>
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Paul Thornton <prt@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
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