Weird behavior of link local gateway assignments

[Marcel Krüger]

Hi,

I encountered some issues when trying to set the gateway to a link-local
IPv6 address in a filter and am wondering if there is a trick I am
missing:

When assigning a link-local address (say fe80::4242%eno1)
to `gw` in a filter using e.g.

    gw = fe80::4242%eno1;

the config file parser complains about a unexpected "%". Of course, it
doesn't work without the `%eno1` either ("Invalid gw address"), so is
there other way to pass the intended interface?

It seems that the interface doesn't get passed even if assigning from an
existing address with correctly set interface, since invoking in a
filter

    gw = gw;

fails with "Invalid gw address" too if `gw` has a link local value.

Is this intended? Is there some other way to set the gw in a filter to a
link local value?

Best regards,
Marcel