What does it mean?
Sep 7 19:12:54 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 7 19:12:54 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 7 19:12:54 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 7 19:12:54 turris /dhcp_host_domain_ng.py: DHCP unknown update operation
Sep 7 19:12:55 turris /dhcp_host_domain_ng.py: Refresh kresd leases