[systemd-bugs] [Bug 90103] New: systemd-networkd fails to bring interface up if ipv6 is disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90103

            Bug ID: 90103
           Summary: systemd-networkd fails to bring interface up if ipv6
                    is disabled
           Product: systemd
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: registo.mailling at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

As the summary says, systemd-networkd fails to bring the interface up if ipv6
is disabled with the ipv6.disable=1 kernel parameter. This is a regression on
systemd 219 as with 218 it was working.

The ip address configured in the respective .network file is assigned to the
interface, in my case a bridge create with a .netdev file, but the interface
will be down.

> ip a s brkvm
4: brkvm: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default 
    link/ether 36:98:33:12:74:df brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.1/24 brd 192.168.56.255 scope global brkvm
       valid_lft forever preferred_lft forever

In this case the output on the journal is as follows:

> journalctl -b -u systemd-networkd -o cat
Starting Network Service...
brkvm           : netdev ready
Enumeration completed
Started Network Service.
brkvm           : Cannot configure IPv6 forwarding for interface: No such file
or directory
brkvm           : brkvm           : could not bring up interface: Address
family not supported by protocol
brkvm           : link configured
wlan0           : gained carrier

If ipv6 is not disabled then the ipv4 address I'm trying to set will be
assigned to the interface and the interface will be brought up.

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