Hi, upon a reboot of a system running BFD I recently noticed BFD breaking with error "Cannot assign requested address" once the system came back. Restarting the BFD protocol in question solved the problem. Hence, apparently the system's network wasn't fully up and running at the time bird started; according to systemd documentation (https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/), one possible fix is to change bird.service from After=network.target to After=network-online.target Wants=network-online.target Alternatively, IP_FREEBIND on the BFD tx socket would allow binding to an IP address that does not (yet) exist which seems more elegant since it doesn't need to take into account that different systems may define "online" differently. I'm wondering whether there's something I'm missing as to why IP_FREEBIND shouldn't be used? Thanks, J.