Eliminating IPv6 (?)

Jamie Landeg-Jones jamie at catflap.org
Tue Jun 18 09:36:18 UTC 2019

"Ronald F. Guilmette" <rfg at tristatelogic.com> wrote:

> As I have already learned, the /etc/rc.firewall script also assumes both the
> presence of, and the desirability of IPv6 support.  And unless one edits that
> file manually... which I have been effectively forced to do... there is no way
> to get it to simply NOT create and install multiple IPv6-related ipfw rules,

I sympathise with your situation, and maybe /etc/rc.firewall could be a bit
more intelligent about it, but when we had 2 seperate files, /etc/rc.firewall
and /etc/rc.firewall6 it was a pain in the arse, and also made it more likely
of mistakes/oversights occuring.

To stop the clutter you mention, and to avoid making the file more complicated
for us who do dual stack, maybe a wrapper could be made around ipfw to get it
to act as a null-op if ip6 is disabled by your suggested rc.conf knob.

I'd have it set rule 1 to something like "deny ip6 from any to any", and then
ignore any further ip6 rules it encounters.

But yes, I can see how the efforts to unify the 4/6 configurations have made
things a bit more complicated for those who only use the one stack (and in
the future, people may start getting similarly affected by inet4 stuff
complicating their configs!)

Cheers, Jamie

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