sometimes netident requests are not responded as expected

Depending on the scenario, sometimes the configured firmware does unexpectedly not answer to netident requests.

Expected behavior: netident frames are always answered in case firmware is configured, independend from the local IP configuration and the PCs IP configuration.

Obeserved behavior:

• netident requests are answered if PC and firmware are in the same subnet. However,
  • only a broadcast netident response is generated for
    • firmware uses 192.168.1.10, netmask 255.255.255.0, gateway 0.0.0.0
    • pc uses 192.168.1.1, netmask 255.255.255.0, gateway 0.0.0.0
  • but a broadcast netident response plus 5 ARP announce frames are generated for
    • firmware uses 192.168.1.10, netmask 255.255.255.0, gateway 192.168.1.10
    • pc uses 192.168.1.1, netmask 255.255.255.0, gateway 0.0.0.0
• netident requests do not lead to any reaction if
  • firmware uses 192.168.2.1, netmask 255.255.255.0, gateway 0.0.0.0
  • pc uses 192.168.1.1, netmask 255.255.255.0, gateway 0.0.0.0
• netident requests lead to 5 ARP announce frames for 192.168.2.1 beeing generated if
  • firmware uses 192.168.2.1, netmask 255.255.255.0, gateway 192.168.2.1
  • pc uses 192.168.1.1, netmask 255.255.255.0, gateway 0.0.0.0