<div dir="auto">Having two networking systems running at once can cause all sorts of problems, not sure if this is the issue here or why NM is still starting but you can try using 'systemctl mask' on it to completely prevent it from running.</div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 8, 2019, 7:37 PM Anthony Joseph Messina <<a href="mailto:amessina@messinet.com">amessina@messinet.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I apologize if this isn't the right place to post this request for assistance. I've attempted the Fedora User's list with no luck and would prefer to ask before filing a bug. After a successful "dnf systemd upgrade" F30->F31, I'm finding that a few of my machines which use systemd-networkd instead of NetworkManager are no longer autoconfiguring IPv6 addresses. I also noticed that even though NetworkManager is disabled, it is initiated in early boot, which I'm not sure is related. It appears as though the system isn't assigning the link-local address and therefore can't communicate via IPv6. If anyone has any pointers on where to begin, I'd appreciate it. Thanks. -A Both systems below use the following /etc/systemd/network/10-wired-dhcp.network: [Match] Name=en* [Network] DHCP=yes IPv6PrivacyExtensions=yes Both systems are running: kernel-5.3.8-300.fc31.x86_64 systemd-243-4.gitef67743.fc31.x86_64 NetworkManager-1.20.4-1.fc31.x86_64 A system that IS working with systemd-networkd displays the following debug output: eno1: New device has no master, continuing without eno1: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST eno1: Link 2 added eno1: udev initialized link eno1: State changed: pending -> initialized eno1: Saved original MTU: 1500 eno1: Remembering foreign address: fe80::f64d:30ff:fe6e:2cf5/64 (valid forever) eno1: Gained IPv6LL eno1: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: local, proto: boot, type: unicast eno1: Remembering route: dst: fe80::f64d:30ff:fe6e:2cf5/128, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: local, proto: kernel, type: local eno1: Remembering route: dst: fe80::/64, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: main, proto: kernel, type: unicast eno1: Remembering updated address: fe80::f64d:30ff:fe6e:2cf5/64 (valid forever) eno1: Updating remembered route: dst: fe80::f64d:30ff:fe6e:2cf5/128, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: local, proto: kernel, type: local eno1: Link state is up-to-date eno1: found matching network '/etc/systemd/network/10-wired-dhcp.network' Setting '/proc/sys/net/ipv6/conf/eno1/disable_ipv6' to '0' eno1: IPv6 successfully enabled Setting '/proc/sys/net/ipv6/conf/eno1/proxy_ndp' to '0' Setting '/proc/sys/net/ipv6/conf/eno1/use_tempaddr' to '2' Setting '/proc/sys/net/ipv6/conf/eno1/accept_ra' to '0' eno1: Started LLDP. eno1: Setting address genmode for link eno1: Acquiring DHCPv4 lease eno1: Discovering IPv6 routers eno1: State changed: initialized -> configuring eno1: Acquiring DHCPv6 lease on NDisc request Another system that IS NOT working displays the following debug output (note the missing Remembering foreign address and Gained IPv6LL lines): eno1: New device has no master, continuing without eno1: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST eno1: Link 2 added eno1: udev initialized link eno1: State changed: pending -> initialized eno1: Saved original MTU: 1500 eno1: Remembering route: dst: ff00::/8, src: n/a, gw: n/a, prefsrc: n/a, scope: global, table: local, proto: boot, type: unicast eno1: Link state is up-to-date eno1: found matching network '/etc/systemd/network/10-wired-dhcp.network' eno1: IPv6 successfully enabled eno1: Started LLDP. eno1: Setting address genmode for link eno1: Acquiring DHCPv4 lease eno1: State changed: initialized -> configuring -- Anthony - <a href="https://messinet.com" rel="noreferrer noreferrer" target="_blank">https://messinet.com</a> F9B6 560E 68EA 037D 8C3D D1C9 FF31 3BDB D9D8 99B6 _______________________________________________ systemd-devel mailing list <a href="mailto:systemd-devel@lists.freedesktop.org" target="_blank" rel="noreferrer">systemd-devel@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/systemd-devel" rel="noreferrer noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/systemd-devel</a></blockquote></div>