[systemd-bugs] [Bug 90831] New: IPv6 Gateway cannot be link local

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90831

            Bug ID: 90831
           Summary: IPv6 Gateway cannot be link local
           Product: systemd
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: mh+freedesktop-bugzilla at zugschlus.de
        QA Contact: systemd-bugs at lists.freedesktop.org

Hi,

in IPv6, it is extremely common that a gateway is offered on a link local IP
address, very often fe80::1. To manually configure this (for example on a
router that does by definition not learn IP addresses / routes / prefixes via
SLAAC), one would need to write

Gateway=fe80::1%eth0

in /etc/systemd/network/foo.network. That syntax is not accepted, leads to a
rather misleading

"rtnl: received address message without valid ifindex, ignoring"

in the log and no route.

To add gold plating, maybe a macro like $IFNAME would be automatically set to
that

Gateway=fe80::1%$IFNAME

would become possible.

This is a rather bad omission since it makes an extremely common configuration
pattern in IPv6 networks impossible.

Greetings
Marc

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