diff options
| author | Sean Edmond <[email protected]> | 2024-05-08 19:39:02 -0700 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2025-05-23 11:28:51 -0600 |
| commit | e6bca3305bbc333cc71e5bf1ee483bbacfa84736 (patch) | |
| tree | abebeb319c700804caba44029b38a9ed3860464d /lib | |
| parent | c867045eef153b0beab69fbc74059fcfc4ad9472 (diff) | |
net: bootp: BOOTP/DHCPv4 retransmission improvements
This patch introduces 3 improvements to align with RFC 951:
- retransmission backoff interval maximum is configurable
- initial retranmission backoff interval is configurable
- transaction ID is kept the same for each BOOTP/DHCPv4 request
In applications where thousands of nodes are serviced by a single DHCP
server, maximizing the retransmission backoff interval at 2 seconds (the
current u-boot default) exerts high pressure on the DHCP server and
network layer.
RFC 951 “7.2. Client Retransmission Strategy” states that the
retransmission backoff interval should be limited to 60 seconds. This
patch allows the interval to be configurable using the environment
variable "bootpretransmitperiodmax"
The initial retranmission backoff period defaults to 250ms, which is
also too small for these scenarios with many clients. This patch makes
the initial retransmission interval to be configurable using the
environment variable "bootpretransmitperiodinit".
Also, on a retransmission it is not expected for the transaction ID to
change (only the 'secs' field should be updated). Let's save the
transaction ID and use the same transaction ID for each BOOTP/DHCPv4
exchange.
Signed-off-by: Sean Edmond <[email protected]>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index 189e6eb31aa..9b62b3bbea7 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -265,7 +265,8 @@ config REGEX choice prompt "Pseudo-random library support type" depends on NET_RANDOM_ETHADDR || RANDOM_UUID || CMD_UUID || \ - RNG_SANDBOX || UT_LIB && AES || FAT_WRITE + RNG_SANDBOX || UT_LIB && AES || FAT_WRITE || CMD_BOOTP || \ + CMD_DHCP || CMD_DHCP6 default LIB_RAND help Select the library to provide pseudo-random number generator |