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DHCPRELEASE, According to RFC 2131 section 3.1, DHCPRELEASE is used by a client to relinquish a network address and cancel any remaining lease time Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>
85 lines
2.8 KiB
Plaintext
85 lines
2.8 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config NETUTILS_DHCPC
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bool "DHCP client"
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default n
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depends on NET_UDP
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select NET_BINDTODEVICE if !NET_UDP_NO_STACK
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---help---
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Enable support for the DHCP client.
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if NETUTILS_DHCPC
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config NETUTILS_DHCPC_HOST_NAME
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string "DHCP client host name"
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default "nuttx"
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config NETUTILS_DHCPC_RECV_TIMEOUT_MS
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int "Number of receive timeout in millisecond"
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default 3000
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---help---
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This is the timeout value when dhcp client receives response
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config NETUTILS_DHCPC_RETRIES
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int "Number of retries for dhcp client request"
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default 3
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---help---
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This setting determines how many times resolver retries request
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until failing.
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config NETUTILS_DHCPC_BOOTP_FLAGS
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hex "Flags of Bootstrap"
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default 0x0000 if !NET_IPFORWARD
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default 0x8000 if NET_IPFORWARD
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---help---
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This setting to set the BOOTP broadcast flags.
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Reference RFC1542: Clarifications and Extensions for the
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Bootstrap Protocol.
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Note: We're not always able to receive unicast traffic before
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being fully configured, e.g. with forward enabled. Then we need
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to enable the broadcast flag under these situations.
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config NETUTILS_DHCPC_RELEASE_RETRIES
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int "DHCP Release send retries"
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default 3
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---help---
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Number of times to retry sending DHCPRELEASE message if sendto() fails.
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Default is 3 attempts.
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config NETUTILS_DHCPC_RELEASE_TRANSMISSION_DELAY_MS
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int "DHCP Release transmission delay (milliseconds)"
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default 10
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---help---
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Delay in milliseconds used for:
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1. Between DHCPRELEASE retry attempts when sendto() fails
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2. To ensure packet transmission before socket closure (if IP clearing enabled)
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Since UDP is connectionless, this delay gives the network stack
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time to actually send the packet. Set to 0 to disable delays
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(not recommended). Default is 10ms.
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config NETUTILS_DHCPC_RELEASE_ENSURE_TRANSMISSION
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bool "Ensure DHCP Release message transmission"
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default y
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---help---
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Add a delay after successfully sending DHCPRELEASE message to ensure
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the packet is actually transmitted before the function returns.
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Since DHCP RELEASE has no ACK response from server, this delay helps
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ensure the release message reaches the server before closing the socket.
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Uses the same delay value as CONFIG_NETUTILS_DHCPC_RELEASE_TRANSMISSION_DELAY_MS.
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config NETUTILS_DHCPC_RELEASE_CLEAR_IP
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bool "Clear IP address after DHCP release"
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default n
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---help---
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Clear all network configuration from the interface after sending
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DHCPRELEASE message. This includes IP address, subnet mask, default
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gateway. RFC 2131 doesn't mandate immediate clearing, so this is
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disabled by default to maintain connectivity.
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Enable this for scenarios where complete network reset is required.
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endif
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