I manually loaded the bonding kernel module using "modprobe" and then rebooted, and the module is still loaded, even though it's not mentioned in /etc/modules. What could cause the kernel module to be loaded on boot if it's not in /etc/modules or in /etc/modprobe.d?
# lsmod | grep bonding bonding 109690 0 # cat /etc/modules # /etc/modules: kernel modules to load at boot time. # # This file contains the names of kernel modules that should be loaded # at boot time, one per line. Lines beginning with "#" are ignored. loop lp rtc 8021q # grep bonding /etc/modprobe.d/* # # dmesg | grep bond [ 5.709956] bonding: Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) [ 5.709960] bonding: Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details. [ 5.714778] bonding: bond0: Adding slave eth0. [ 5.721789] bonding: bond0: Setting MII monitoring interval to 100. [ 5.726345] bonding: bond0: enslaving eth0 as an active interface with an up link. [ 5.729437] bonding: bond0: Unable to set primary slave; bond0 is in mode 0 [ 5.731392] bonding: bond0: setting mode to balance-xor (2). [ 5.734097] 8021q: adding VLAN 0 to HW filter on device bond0 [ 5.734942] bonding: bond0: Adding slave eth1. [ 5.746263] bonding: bond0: enslaving eth1 as an active interface with an up link. [ 5.749595] bonding: bond0: Unable to set primary slave; bond0 is in mode 2