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I'm on a fresh install of 18.04 Server. It ships with the following file
in /etc/sysctl.d:
# cat /etc/sysctl.d/10-ipv6-privacy.conf
# IPv6 Privacy Extensions (RFC 4941)
# ---
# IPv6 typically uses a device's MAC address when choosing an IPv6 address
# to use in autoconfiguration. Privacy extensions allow using a randomly
# generated IPv6 address, which increases privacy.
#
# Acceptable values:
# 0 - don’t use privacy extensions.
# 1 - generate privacy addresses
# 2 - prefer privacy addresses and use them over the normal addresses.
net.ipv6.conf.all.use_tempaddr = 2
net.ipv6.conf.default.use_tempaddr = 2
however, on boot, my physical NIC enp0s31f6 ends up with use_tempaddr
set to 0:
# for i in $(ls /proc/sys/net/ipv6/conf/*/use_tempaddr); do echo $i; cat $i;
done;
/proc/sys/net/ipv6/conf/all/use_tempaddr
2
/proc/sys/net/ipv6/conf/default/use_tempaddr
2
/proc/sys/net/ipv6/conf/enp0s31f6/use_tempaddr
0
/proc/sys/net/ipv6/conf/lo/use_tempaddr
-1
Explicitly adding the following line to 10-ipv6-privacy.conf does not
fix:
net.ipv6.conf.enp0s31f6.use_tempaddr = 2
It appears that a later stage of the boot process reapplies the 0 value.
A workaround is to add the line, then create an additional systemd unit
that runs `systemctl restart systemd-sysctl.service` at the end of the
boot process.
I think the expected behavior, given the contents of
/etc/sysctl.d/10-ipv6-privacy.conf, is that all NICs should come up with
use_tempaddr set to 2. This does not happen; moreover, the workaround is
counterintuitive.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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use_tempaddr is reset to 0, despite /etc/sysctl.d
https://bugs.launchpad.net/bugs/1770919
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