After today’s adventure with the kernel bonding, I just took a look at the code

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         if (miimon) {
                 printk(KERN_INFO DRV_NAME
                        ": MII link monitoring set to %d msn",
                        miimon);
         } else if (arp_interval) {
                 int i;

                 printk(KERN_INFO DRV_NAME
                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
                        arp_interval,
                        arp_validate_tbl[arp_validate_value].modename,
                        arp_ip_count);

                 for (i = 0; i < arp_ip_count; i++)
                         printk (" %s", arp_ip_target[i]);

                 printk("n");

         } else {
                 /* miimon and arp_interval not set, we need one so things
                  * work as expected, see bonding.txt for details
                  */
                 printk(KERN_WARNING DRV_NAME
                        ": 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.n");
         }

If I read it right, you only get the KERN_WARNING for “either miimon or arp_interval” only if miimon or arp_interval isn’t set … but at least my config says it is .. 🤷 .. bed time for me :rolling_eyes: