Eliminating IPv6 (?)

Rodney W. Grimes freebsd-rwg at gndrsh.dnsmgr.net
Wed Jun 19 23:23:05 UTC 2019

> Rodney W. Grimes writes:
> >  > And god only knows how much will break once I've done that.  How many other
> >  > people have tested -all- of the resulting binaries, seriously, on actual
> >  > production systems?  (I may be the first one ever, at least for 12.0.)
> >  
> >  I also agree here, running a WITHOUT_IPV6 userland is both very
> >  painful to get built AND has issues that one does not need to face,
> >  like I showed in another thread about netstat -6.
> 	Wider question:
> 	Say I'm running a system with both IPv4 and IPv6 enabled.
> 	Stuff Happens(tm) and I want to completely disable IPv6 for some
> indefinite but temporary period - not chamge any configuration
> settings or firewall rules, but just have the code finish processing
> current packets (or not) and then ignore further traffic.  There will
> be consequences; I'm prepared to accept them.
> 	Is there a single master switch - a sysctl, perhaps, or something
> in /etc/rc.d - that lets me do that?

You do raise a very valid point.

ipfw add 1 deny ipv6 from any to any

That is about the only "master" switch I can think of that would
be very effective.

> 				Robert Huff
Rod Grimes                                                 rgrimes at freebsd.org

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