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AXIS Cameras

Testing done 7/9/2021 with two AXIS M2026-LE MkII cameras running firmware version 8.40.3.

Behavior on boot

  • The netd service manages assigning IP addresses to the Ethernet interface:
    • If the device is configured to use DHCP, the IP address 192.168.0.90/24 is assigned to the Ethernet interface and the DHCP client is started. If a DHCP response is received from a DHCP server, the IP address received is replaces the 192.168.0.90/24 address, along with all other DHCP options received from the server. If no DHCP response is received from a DHCP server, the 192.168.0.90/24 IP address remains instantiated on eth0 and the DHCP client continues to send DHCP requests.
    • If the device is configured with a specified static IP address, that static IP address is instantiated on the Ethernet interface eth0.
  • The zeroconf-ip service claims a link-local IP address in the range 169.254.0.0/16 and instructs the netd service to add this as a secondary IP address on the Ethernet interface eth0. This IP address is always accessible on the device, unless the ZeroConf service gets disabled.

AXIS IP Utility

The AXIS IP Utility uses MDNS requests to discover cameras on the network. Multiple UDP requests with different PTR queries are sent to the multicast address 224.0.0.251. The following requests were sent from the test computer to the diagnostic network with two cameras attached.

  • 10.77.69.2 224.0.0.251 MDNS Standard query 0x0000 PTR _axis-nvr._tcp.local, "QM" question

  • 10.77.69.2 224.0.0.251 MDNS Standard query 0x0000 PTR _axis-bwsc._tcp.local, "QM" question PTR _axis-video._tcp.local, "QM" question

Cameras respond to the queries by sending an MDNS response to the 224.0.0.251 multicast address. The following are the responses from the two cameras connected to the diagnostic test network:

  • 169.254.93.22 224.0.0.251 MDNS Standard query response 0x0000 PTR AXIS M2026-LE Mk II - B8A44F0A98A1._axis-video._tcp.local TXT, cache flush A, cache flush 169.254.93.22 A, cache flush 192.168.0.91 SRV, cache flush 0 0 80 axis-b8a44f0a98a1.local NSEC, cache flush AXIS M2026-LE Mk II - B8A44F0A98A1._axis-video._tcp.local NSEC, cache flush axis-b8a44f0a98a1.local

  • 169.254.190.127 224.0.0.251 MDNS Standard query response 0x0000 PTR AXIS M2026-LE Mk II - B8A44F1136E5._axis-video._tcp.local TXT, cache flush A, cache flush 169.254.190.127 A, cache flush 10.77.69.198 SRV, cache flush 0 0 80 axis-b8a44f1136e5.local NSEC, cache flush AXIS M2026-LE Mk II - B8A44F1136E5._axis-video._tcp.local NSEC, cache flush axis-b8a44f1136e5.local

You can see that both camera responses shown above list all of the IP addresses instantiated on the camera.

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