Oops. Of course, the good syntax to discard default gateway in is
if net ~ [ ::/0 ]
and not :
if net ~ [ ::/0+ ]
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import filter { # This block filters ::/0 in
if net ~ [ ::/0 ] then
reject "ripng:rejected:DG";
else
accept "ripng:accepted:not-DG";
};export all; ---------------------------------------------------
