Ubuntu
knockd package

  1. Bug #1912826
  2. Comment #5

Comment 5 for bug 1912826

Revision history for this message
Ivo Straka (ivo-straka) wrote :

Here are the steps I used to reproduce the bug:

1. install Linux Mint 20.1 MATE
2. install package knockd
3. in /etc/knockd.conf, add Interface = eno1 (or your network interface)
4. in /etc/default/knockd, set START_KNOCKD=1
5. run "sudo systemctl enable knockd"
6. restart
7. after restarting, knockd is not up - it failed due to eno1 not being up

I also tried to reproduce the bug on Ubuntu Desktop 20.04 LTS (focal), minimal install variant. However, no bug occurred. Mint 20.1 is based on focal and uses the same knockd package version, but the bug occurred only on Mint.

According to syslog (short version attached), it appears that even the kernel loaded the network card after knockd tried to connect. It is possible that how fast the system brings the network up depends on other software and Ubuntu just happens to be faster.

If you'd like the whole syslog, I'll e-mail it privately. Also let me know if I can help by doing some additional tests. Thank you!