Date: Wed, 29 Mar 2017 19:49:55 -0700 From: Rui Paulo <rpaulo@me.com> To: Lawrence Stewart <lstewart@freebsd.org>, freebsd-net@freebsd.org Cc: Hiroki Sato <hrs@freebsd.org>, ler@lerctr.org Subject: Re: IPv6: "xxx::x already configured" in logs... why? Message-ID: <1490842195.3260.35.camel@me.com> In-Reply-To: <ea679ecc-0466-5b6c-636c-8e87cc195526@freebsd.org> References: <20140612202349.GA65079@thebighonker.lerctr.org> <20140619.181129.1279477227287764712.hrs@allbsd.org> <20140619140801.GA65420@thebighonker.lerctr.org> <20140620.130812.1612764660960146940.hrs@allbsd.org> <ea679ecc-0466-5b6c-636c-8e87cc195526@freebsd.org>
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On Wed, 2017-03-29 at 21:46 -0500, Lawrence Stewart wrote: > [resurrecting an old thread] > > On 19/06/2014 23:08, Hiroki Sato wrote: > > Larry Rosenman <ler@lerctr.org> wrote > > in <20140619140801.GA65420@thebighonker.lerctr.org>: > > > > le> > le> Ideas? (I may be an idiot, so any criticism welcomed). > > le> > le> > > le> > le> if you need the 1841's config, I can supply that as > > well. It's using a Hurricane > > le> > le> electric Tunnel. > > le> > > > le> > How frequent were the log message added into > > /var/log/messages? And > > le> > when did it start to happen after boot. Just after lagg0 is > > le> > configured? > > le> > > > le> > -- Hiroki > > le> Looks like: > > le> > > le> Jun 12 07:00:01 thebighonker kernel: in6_ifadd: > > 2001:470:1f0f:3ad:223:7dff:fe9e:6e8a is already configured > > > > Thank you. Three more questions: > > > > 1. output of "ifconfig lagg0", "ifconfig bce0", and "ifconfig > > bce1". > > > > 2. output of "netstat -s -i". > > > > 3. output of "ndp -p". > > > > The cause of the message is that the automatically-configured > > address > > is not recognized as "configured" one and FreeBSD IPv6 stack is > > trying to add it every time a Router Advertisement message is > > received. I am still not sure why it happened, but the above > > three > > would help for further investigation. > > I've recently set up a VPS with v6 and am seeing the same "in6_ifadd: > <v6_addr> is already configured" messages in response to periodically > received router advertisements every 5-10 mins. The host is a KVM- > based > virtual machine with vtnet-based NIC. v6 is fully functional with the > statically assigned v6 address, but the spam in /var/log/messages is > annoying. > > > FreeBSD revision: > FreeBSD lauren 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r315059: Sun > Mar > 12 20:44:50 AEDT 2017 > root@builder-head-amd64:/usr/obj/lauren/usr/src/sys/GENERIC- > NODEBUG amd64 > > > Relevant bits from /etc/rc.conf: > rtsold_enable="YES" > ipv6_activate_all_interfaces="YES" > rtsold_flags="-aF" > ifconfig_vtnet0_ipv6="inet6 <v6_addr> prefixlen 64" > > > Interface: > vtnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 > mtu 1500 > > options=6c07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_H > WCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> > ether <mac> > inet <v4_addr> netmask 0xfffffe00 broadcast <v4_bcast> > inet6 <v6_linklocal>%vtnet0 prefixlen 64 scopeid 0x1 > inet6 <v6_addr> prefixlen 64 > nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> > media: Ethernet 10Gbase-T <full-duplex> > status: active > > > I would have thought rtsold should be able to play nice with > statically > assigned v6 addresses... any ideas? Hmm, why would it? If you setup an IPv6 address and then there's a router solicitation advertising the same address, the log message makes sense. I don't think you should run rtsold if you have a static IPv6 address. -- Rui Paulo
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