On 02/16/2017 04:34 AM, Alice Wonder wrote:
On 02/16/2017 04:20 AM, James Hogarth wrote:
On 16 February 2017 at 12:02, James Hogarth <james.hoga...@gmail.com>
On 16 February 2017 at 11:46, James Hogarth <james.hoga...@gmail.com>
On 16 February 2017 at 11:35, Alice Wonder <al...@domblogger.net>
On 02/16/2017 03:28 AM, James Hogarth wrote:
On 16 February 2017 at 10:42, Alice Wonder <al...@domblogger.net>
On 02/16/2017 02:32 AM, James Hogarth wrote:
On 16 February 2017 at 10:17, Alice Wonder
On 02/16/2017 02:03 AM, James Hogarth wrote:
On 16 February 2017 at 09:09, Alice Wonder <al...@domblogger.net>
On 02/16/2017 12:54 AM, Tony Mountifield wrote:
Alice Wonder <al...@domblogger.net> wrote:
I can not figure out what I need to do.
Apparently according to linode support, the VM is trying to
address with some privacy stuff enabled by default causing
grab the IPv6 address that is assigned to me.
Does the accepted answer at the following link give you any
Not really - I tried
net.ipv6.conf.all.use_tempaddr = 0
and it still fails to grab the proper IPv6
Just in case, I did ask Linode support to verify that my
what it is suppose to be. Still waiting to hear on that.
it still is key=value ... it uses the ifcfg- files (via the rh
plugin) and they are all key=value
It would be helpful if you could paste the journal output
-u NetworkManager) from the time period of attempting to get an
also the nmcli conn sh <connection_name> information for the
along with your ifcfg- files
ifcfg-lo is the only one that exists on any of the servers -
VMs that grab the correct IPv6 address.
from /sbin/ifconfig -a :
For a start stop using ifconfig ... it's broken at this point on
linux, especially on multi ip and ipv6 scenarios
Use `ip -6 addr sh` for ipv6 specfic stuff, or just ip addr sh
all IP address stuff regardless of family
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 22.214.171.124 netmask 255.255.255.0 broadcast
inet6 fe80::a8ad:d312:4ef4:7272 prefixlen 64 scopeid
inet6 2a01:7e00::825f:e564:ad53:72fc prefixlen 64
ether f2:3c:91:18:8a:7e txqueuelen 1000 (Ethernet)
RX packets 9903 bytes 1088621 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7786 bytes 1087223 (1.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
That hardware address - the 18:8a:7e corresponds with what the
is suppose to be. But that's not the address it is grabbing,
fact that net.ipv6.conf.all.use_tempaddr = 0 is set.
I'm seriously wondering if the real issue is a mis-configured dhcp
their London facility because nothing makes sense.
journalctl -u NetworkManager
reports no journal entries found.
So are you not using NetworkManager then? there should be some
I think the problem must be on their end.
It all was working fine until they migrated the VM because of a
issue, and I suspect now all the hardware address privacy stuff
issue is barking up the wrong tree because all the reading I
to indicate that with
net.ipv6.conf.all.use_tempaddr = 0
that a fake temporary hardware address would not be sent to
server when obtaining the address, but the real one, that
my assigned address.
Only if the kernel is doing SLAAC ... if other things (eg NM) are
handling it directly they may act differently ... but then from the
lack of logs is NM actually handling this?
Does systemctl status NetworkManager show it running and does nmcli
systemctl status NetworkManager
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service;
vendor preset: enabled)
Active: active (running) since Thu 2017-02-16 08:19:34 UTC; 2h
* more stuff *
eth0: connected to Wired connection 1
"Red Hat Virtio network device"
ethernet (virtio_net), F2:3C:91:18:8A:7E, hw, mtu 1500
ip4 default, ip6 default
* more stuff for other interfaces *
The output of
sysctl -a | grep net.ipv6 :
It looks from that like it should not be hiding the real MAC
do nmcli conn show "Wired connection 1"
the entries of interest are:
man nm-settings to get what they mean
CentOS mailing list
ipv6.ip6-privacy: -1 (unknown)
Okay so from the man page:
The permitted values are:
the property is set to
"eui64", the addresses
will be generated using
the interface tokens
derived from hardware
address. This makes the
host part of the
address to stay
constant, making it
possible to track
host's presence when it
changes networks. The
address changes when
the interface hardware
is replaced. The value
enables use of
secure hash of a secret
host-specific key along
with the connection
identification and the
network address as
specified by RFC7217.
This makes it
impossible to use the
address track host's
presence, and makes the
address stable when the
hardware is replaced.
I'm not certain (would have to go get changelogs) but I suspect this
was a change at 7.3 with the rebase of NetworkManager
From what you say you want it sounds like you want eui64 - the one
based entire on the current MAC - whereas the present version is using
stable-privacy to avoid tracking.
Note that this is distinct and different to ip6-privacy which is
concerned about the automatic generation of temporary addresses to use
for outbound communication.
Okay a little more research as I'm curious when it changed from EUI64
by default ...
NM changed upstream to stable-privacy at 1.2 (the privacy extensions
for the external connections were added at 1.0.4)
RHEL 7.2 enabled privacy extensions by default:
But at that milestone we had NM 1.0.6
At the RHEL 7.3 release NM was rebased to 1.4.0
It was briefly referenced with this change in the 7.3 release notes
but honestly it's pretty opaque ...
"NetworkManager now supports new device types, improved stacking of
virtual devices, LLDP, stable privacy IPv6 addresses (RFC 7217),
detects duplicate IPv4 addresses, and controls a host name through
systemd-hostnamed. Additionally, the user can set a DHCP timeout
property and DNS priorities."
Of course unless you knew what RFC 7217 was you'd have no idea this
was the effect and there's no note that stable-privacy is the new
default behaviour ARGH
Disappointingly it's not listed in the "Networking" part of the
release notes ....
I think I'll raise the priority on my blog for the article I'm
intending on the NM rebase ... there are nice things in the rebase
like the arbitrary layering of teams, vlans and bridges but then
there's unexpected stuff like this as well which should be made more
So ... Alice if you want to configure the system with the older EUI64
behaviour then in your ifcfg file for that interface you need
IPV6_ADDR_GEN_MODE=eui64 and then restart NetworkManager (or `nmcli
conn reload` rather than a full service restart or `nmcli conn mod
"Wired Connection 1" ipv6.addr-gen-mode eui64` to do it at the CLI
without editing files and needing a connection reload).
Oh and last message about this ...
This was the email to fedora-devel at the time of the NM 1.2
Systems that existed prior to the package didn't change their
configuration, it was only newly built systems that picked up the new
default - which might explain what you saw depending on how they
handled the migration.
There's a good reason that stable-privacy was moved to for automatic
addressing, but for your setup you may want to set the older eui64 to
keep things consistent.
CentOS mailing list
I suspect this is it. However -
yet it still lists stable-privacy
But I think that is it, so I'll figure it out.
Thank you so much.
nmcli c modify "Wired connection 1" ipv6.addr-gen-mode eui64
That solved it.
Again, thank you so much.
Now I need to set that on all my other linodes, which I suspect are only
working on IPv6 because they haven't been restarted in a long time.
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