pfSense

I'd like to request to reopen this issue.

IMHO it's not semantic to use different hostnames for the same host. A host's hostname should neither be dependent of the type of its network interface nor the number of its network interfaces it uses to join a network - it's still the same host.

Examples:
+ Only one interface online at a time:
If_Wired: 00:00:00:00:00:01
If_Wireless: 00:00:00:00:00:02
IP_Both: 192.168.0.101
Hostname: TheHostName

+ Both interfaces online at the same time
If_Wired: 00:00:00:00:00:01
If_Wireless: 00:00:00:00:00:02
IP_Wired: 192.168.0.101
IP_Wireless: 192.168.0.102
Hostname: TheHostName

+ All interfaces online at the same time
If_1_Wired: 00:00:00:00:00:01
If_2_Wired: 00:00:00:00:00:02
If_3_Wired: 00:00:00:00:00:03
If_N_Wired: 00:00:00:00:00:0N
IP_If_1: 192.168.0.101
IP_If_2: 192.168.0.102
IP_If_3: 192.168.0.103
IP_If_N: 192.168.0.10N
Hostname: TheHostName

Just tested this on the most recent release (2.4.4-RELEASE-p3) and it is not a problem anymore to have the same IP and hostname (with differing MAC addresses) entered as a DHCP reservation. I don't know since when this is possible, but it is a least from now on.