Here’s a short howto on how to build it fixed. $ sudo apt build-dep frr […] $ apt source frr […] $ cd frr-8* $ DEB_BUILD_PROFILES=pkg.frr.pim6d dpkg-buildpackage -us -uc -b $ sudo dpkg -i ../frr_*.deb Though it didn’t fix it, here’s an interesting command that made stuff like ip -6 mroute look like it should work: