DNS traffic: dynamic updates (1/2)

• DNS dynamic updates

  • Implemented by the dhcp service (even if IP address is static)
    • Register this connection's addresses in DNS (enabled by default)
    • at machine startup with static IP address (A and PTR)
    • at each IP address change with dynamic IP address (DHCP)
      • Depends on DHCP server configuration (by default, only A record)
    • each 24 hours by default
      • DefaultRegistrationRefreshInterval registry value
      • Default TTL of 20 minutes for updated records {A, PTR} ( DefaultRegistrationTtl registry value)
    • manual registration: ipconfig /registerdns