YES! That fixed the issue! THANK YOU! I was up until 3 AM trying to sort that out. No clue how I missed that directive in the man page. Zombie eyes, I guess.
One this that still bothers me - As I stated in the debug comment, the PCAP filters are INDEED CORRECT and show the correct (supposed) IP in the expression when I tried using a virtual NIC, so why wasn't that actually working as expected? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1873186 Title: knockd does not work on additional IP address of a NIC To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/knockd/+bug/1873186/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs