Date: Sat, 4 Mar 2017 21:05:34 -0500 From: Viktor Dukhovni <freebsd@dukhovni.org> To: freebsd-net@freebsd.org Subject: The 6to4 stf0 interface flapping in/out of tentative in FreeBSD 11.0-RELEASE-p8... Message-ID: <CEBB4E6F-4D5F-491F-8C81-C9F81325078B@dukhovni.org>
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In trying to set up a 6to4 node under 11.0-RELEASE-p8, and the stf0
interface is constantly flipping in and out of "tentative" state, at
seemingly 1 second intervals. Is that to be expected? Am I missing
some non-obvious configuration setting?
$ ifconfig stf0; echo; for i in $(seq 10); do ifconfig stf0 | grep =
inet; sleep 1; done
stf0: flags=3D1<UP> metric 0 mtu 1280
inet6 2002:6c15:5974:1::1 prefixlen 16
nd6 options=3D101<PERFORMNUD,IGNORELOOP>
groups: stf
inet6 2002:6c15:5974:1::1 prefixlen 16 tentative
inet6 2002:6c15:5974:1::1 prefixlen 16
inet6 2002:6c15:5974:1::1 prefixlen 16 tentative
inet6 2002:6c15:5974:1::1 prefixlen 16
inet6 2002:6c15:5974:1::1 prefixlen 16 tentative
inet6 2002:6c15:5974:1::1 prefixlen 16
inet6 2002:6c15:5974:1::1 prefixlen 16 tentative
inet6 2002:6c15:5974:1::1 prefixlen 16
inet6 2002:6c15:5974:1::1 prefixlen 16 tentative
inet6 2002:6c15:5974:1::1 prefixlen 16
My configuration is (slightly trimmed):
$ ifconfig igb0
igb0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 =
mtu 1500
=
options=3D6403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCS=
UM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
inet 108.21.89.116 netmask 0xffffff00 broadcast 108.21.89.255=20
inet6 2002:6c15:5974::1 prefixlen 64=20
nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL>
status: active
$ netstat -6rn
...
default 2002:c058:6301:: UGS =
stf0
2002::/16 link#4 U =
stf0
2002:6c15:5974::/64 link#1 U =
igb0
2002:6c15:5974::1 link#1 UHS =
lo0
2002:6c15:5974:1::1 link#4 UHS =
lo0
In /etc/rc.conf I have:
stf_interface_ipv4addr=3D"108.21.89.116"
stf_interface_ipv6_slaid=3D1
ifconfig_igb0_ipv6=3D"inet6 2002:6c15:5974::1 prefixlen 64"
ipv6_gateway_enable=3D"YES"
ipv6_defaultrouter=3D"2002:c058:6301::"
ipv6_network_interfaces=3D"igb0"
rtadvd_enable=3D"YES"
rtadvd_interfaces=3D"igb0"
Other than a slightly higher than desired packet loss rate (perhaps to =
be
expected with 6to4 tunnels), this does not seem to impact connectivity:
$ ping6 -c 20 -n mx01.domeneshop.no
PING6(56=3D40+8+8 bytes) 2002:6c15:5974:1::1 --> 2a01:5b40:0:2201::1
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D0 hlim=3D55 time=3D105.615 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D1 hlim=3D55 time=3D104.798 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D2 hlim=3D55 time=3D105.384 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D3 hlim=3D55 time=3D104.726 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D4 hlim=3D55 time=3D105.361 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D5 hlim=3D55 time=3D104.387 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D6 hlim=3D55 time=3D104.730 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D7 hlim=3D55 time=3D104.712 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D8 hlim=3D55 time=3D104.951 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D9 hlim=3D55 time=3D104.697 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D10 hlim=3D55 time=3D104.718 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D11 hlim=3D55 time=3D104.511 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D12 hlim=3D55 time=3D105.174 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D13 hlim=3D55 time=3D104.760 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D14 hlim=3D55 time=3D105.056 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D15 hlim=3D55 time=3D104.860 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D16 hlim=3D55 time=3D104.716 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D17 hlim=3D55 time=3D104.669 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D18 hlim=3D55 time=3D105.137 =
ms
16 bytes from 2a01:5b40:0:2201::1, icmp_seq=3D19 hlim=3D55 time=3D105.043 =
ms
I mostly the 100% sucsess also with www.google.com, but now and then a
few pings are lost:
$ ping6 www.google.com
PING6(56=3D40+8+8 bytes) 2002:6c15:5974::1 --> 2607:f8b0:400d:c00::6a
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D0 hlim=3D57 time=3D16.488=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D1 hlim=3D57 time=3D16.332=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D2 hlim=3D57 time=3D16.621=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D3 hlim=3D57 time=3D16.645=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D4 hlim=3D57 time=3D17.336=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D5 hlim=3D57 time=3D15.978=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D6 hlim=3D57 time=3D17.073=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D7 hlim=3D57 time=3D52.323=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D8 hlim=3D57 time=3D35.891=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D9 hlim=3D57 time=3D38.653=
ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D10 hlim=3D57 =
time=3D45.235 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D11 hlim=3D57 =
time=3D25.149 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D12 hlim=3D57 =
time=3D16.357 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D14 hlim=3D57 =
time=3D16.719 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D16 hlim=3D57 =
time=3D17.122 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D17 hlim=3D57 =
time=3D16.963 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D18 hlim=3D57 =
time=3D16.130 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D19 hlim=3D57 =
time=3D23.763 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D20 hlim=3D57 =
time=3D16.295 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D21 hlim=3D57 =
time=3D18.302 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D22 hlim=3D57 =
time=3D16.994 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D23 hlim=3D57 =
time=3D18.312 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D24 hlim=3D57 =
time=3D16.419 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D25 hlim=3D57 =
time=3D17.241 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D26 hlim=3D57 =
time=3D17.931 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D27 hlim=3D57 =
time=3D17.478 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D28 hlim=3D57 =
time=3D17.514 ms
16 bytes from 2607:f8b0:400d:c00::6a, icmp_seq=3D29 hlim=3D57 =
time=3D17.684 ms
--- www.google.com ping6 statistics ---
31 packets transmitted, 28 packets received, 9.7% packet loss
Possibly relevant sysctl output:
$ sysctl -a | grep ip6
net.inet6.ip6.forwarding: 1
net.inet6.ip6.redirect: 1
net.inet6.ip6.hlim: 64
net.inet6.ip6.maxfragpackets: 1017650
net.inet6.ip6.accept_rtadv: 0
net.inet6.ip6.log_interval: 5
net.inet6.ip6.hdrnestlimit: 15
net.inet6.ip6.dad_count: 1
net.inet6.ip6.auto_flowlabel: 1
net.inet6.ip6.defmcasthlim: 1
net.inet6.ip6.gifhlim: 30
net.inet6.ip6.kame_version: FreeBSD
net.inet6.ip6.use_deprecated: 1
net.inet6.ip6.rr_prune: 5
net.inet6.ip6.v6only: 1
net.inet6.ip6.use_tempaddr: 0
net.inet6.ip6.temppltime: 86400
net.inet6.ip6.tempvltime: 604800
net.inet6.ip6.auto_linklocal: 1
net.inet6.ip6.prefer_tempaddr: 0
net.inet6.ip6.use_defaultzone: 0
net.inet6.ip6.maxfrags: 1017650
net.inet6.ip6.mcast_pmtu: 0
net.inet6.ip6.no_radr: 0
net.inet6.ip6.norbit_raif: 0
net.inet6.ip6.rfc6204w3: 0
net.inet6.ip6.deembed_scopeid: 1
net.inet6.ip6.dad_enhanced: 0
net.inet6.ip6.mcast.loop: 1
net.inet6.ip6.mcast.maxsocksrc: 128
net.inet6.ip6.mcast.maxgrpsrc: 512
security.jail.param.ip6.saddrsel: 0
security.jail.param.ip6.: 0
--=20
Viktor.
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