Package: ifenslave Version: 2.12 Problem while trying to bring up bond0 or any bonding interface.
ifup[933]: No iface stanza found for master bond0 The root cause is ifenslave shipped with a script, referring to ifstate command which is not present. Script:/etc/network/if-pre-up.d/ifenslave ... setup_slave_device() { # Require the bond master to have an iface stanza if ! ifstate -l "$IF_BOND_MASTER" 2>/dev/null ; then echo "No iface stanza found for master $IF_BOND_MASTER" >&2 exit 1 fi ... To fix switched to ip command that achieve the same goal ... setup_slave_device() { # Require the bond master to have an iface stanza if ! ip link show dev "$IF_BOND_MASTER" 2>/dev/null; then echo "No iface stanza found for master $IF_BOND_MASTER" >&2 exit 1 fi ... Debian 11.0 (5.10.0-8-amd64 #1 SMP Debian 5.10.46-3 (2021-07-28) x86_64 GNU/Linux) Reference: https://blog.rtsp.us/debian-11-bullseye-bonding-problem-9d8d8866117e