Date: Wed, 19 Jun 2019 08:42:26 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> To: Eugene Grosbein <eugen@grosbein.net> Cc: "Ronald F. Guilmette" <rfg@tristatelogic.com>, freebsd-questions@freebsd.org, freebsd-net@freebsd.org Subject: Re: Eliminating IPv6 (?) Message-ID: <201906191542.x5JFgQQ2018770@gndrsh.dnsmgr.net> In-Reply-To: <d6a5d6b8-1630-3095-dd0b-22b49213176e@grosbein.net>
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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
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