DHCP Client API

1
DHCP Client API
2
Auto-Configuration with DHCP
DHCP Server
NETWORK
3
Enabling the DHCP Client

• Using Appconf.h
• Set APP_USE_NVRAM to 0
• Set APP_IP_USE_DHCP to 1

• Using NVRAM
• Set APP_USE_NVRAM to 0
• Use the useDHCP datamember
• Enable or disable DHCP through the
  defaultParameters record defaultParams) or NVRAM
  (nvParams)

4
After Enabling, the Client

• Configures the TCP/IP protocol stack with the
  correct IP address, subnet mask, and default
  gateway
• Starts a background task that renews the lease
  whenever it is about to expire
• Loads any DNS server acquired through DHCP into
  the list of known DNS servers
• Calls DhcpNowBound()

5
DHCP API

• DhcpNowBound()
• DhcpLostLease()

• Called when DHCP server acknowledges the client.
• IP Parameters accessible from within this
  function
• IP Address
• Subnet Mask
• Default Gateway

• Called by lease renewal thread when Client loses
  IP address lease.
• Used for graceful shutdown, however IP address
  cannot be re-used.