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From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>
Message-Id: <201906191542.x5JFgQQ2018770@gndrsh.dnsmgr.net>
Subject: Re: Eliminating IPv6 (?)
In-Reply-To: <d6a5d6b8-1630-3095-dd0b-22b49213176e@grosbein.net>
To: Eugene Grosbein <eugen@grosbein.net>
Date: Wed, 19 Jun 2019 08:42:26 -0700 (PDT)
CC: "Ronald F. Guilmette" <rfg@tristatelogic.com>,
freebsd-questions@freebsd.org, freebsd-net@freebsd.org
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> 18.06.2019 10:10, Ronald F. Guilmette wrote:
>
> > How can I turn off IPv6 entirely without rebuilding the kernel?
>
> You cannot. GENERIC kernel specifically enables IPv6 support and you need to disable it at compile time.
> And if you do, you better rebuild the world too using WITHOUT_INET6=yes in the /etc/src.conf
> or else some utilities compiled with INET6 by default will query kernel
> for IPv6-specific data (like routing entries) and complain that your kernel does not know about it.
I have not seen these issues, can you give a specific example that fails?
A netstat -rn on a v4 only kernel simple reports the v4 table, and iirc a
netstat -rn6 returns a "Protocol not supported error" as should all other
things.
> World built WITHOUT_INET6 has no such rough edges.
I find that actually causes me more issues, as then my
netstat -rn6 returns a hard error due to:
case '6':
#ifdef INET6
af = AF_INET6;
#else
errx(1, "IPv6 support is not compiled in");
#endif
--
Rod Grimes rgrimes@freebsd.org