Date: Wed, 8 Feb 2012 13:23:29 -0500 From: Gary Palmer <gpalmer@freebsd.org> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-net@FreeBSD.org, Gleb Smirnoff <glebius@FreeBSD.org> Subject: Re: kern/161899: Repeating RTM_MISS packets causing high CPU load for ntpd Message-ID: <20120208182329.GC10082@in-addr.com> In-Reply-To: <F2AB6FBA67934AF38EA2BCB528D27F34@multiplay.co.uk> References: <201202081300.q18D0Wnc067564@freefall.freebsd.org> <F2AB6FBA67934AF38EA2BCB528D27F34@multiplay.co.uk>
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On Wed, Feb 08, 2012 at 01:44:56PM -0000, Steven Hartland wrote: > ----- Original Message ----- > From: "Gleb Smirnoff" <glebius@FreeBSD.org> > >> Any update on this, would have been nice to see a fix hit before > >> 9.0. If you need any more information please let me know. > > > >AFAIK, this is no longer a problem in 9.0-RELEASE or in HEAD. > > > >The cause for this number of misses is absense of a route for > >IPv4 mapped block in IPv6 routing table. > > > >Here it is: > > > ># netstat -rn -f inet6 > >Routing tables > > > >Internet6: > >Destination Gateway Flags > >Netif Expire > >::/96 ::1 UGRS > >lo0 > > > >Some rc.d script installs this prefix in 9.0 and 10.0. If it hasn't > >been merged to stable/8, then it needs to be found and merged. > > Thanks Gleb! > > Running the following commands does indeed stop this > route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject > route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject > > I found these in /etc/rc.d/network_ipv6 but I can't see why > these wouldnt be run on a machine that doesn't have an IPv6 > address, they seem to be added correctly on machines that do. Speculation: the machine(s) which didn't have the routes maybe didn't have ipv6_enable="YES" in /etc/rc.conf? Gary
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