#990110 Knockd Wishlist Item - Listen on Interface without IP Address

Package:
knockd
Source:
knockd
Description:
small port-knock daemon
Submitter:
Erased Hammer
Date:
2021-06-20 21:09:03 UTC
Severity:
wishlist
#990110#5
Date:
2021-06-20 21:07:23 UTC
From:
To:
Problem: When attempting to make knockd listen on an interface without
an IP Address, the debug output says "could not get IP address for
[INTERFACE]". Knockd exits immediately after.

Solution:
Knockd should support listening on interfaces that do not have IP
Addresses. Bridged vlan interfaces do not contain IP Addresses,
despite receiving traffic destined for the local machine. Some
commercial applications of debian (such as Untangle) split
bidirectional communication across two vlan interfaces, the receiving
interface being the unaddressed one.

Uname -a:
4.19.0-11-untangle-amd64 #1 SMP Debian 4.19.146-1 (2020-09-29) x86_64 GNU/Linux