[OpenWrt-Devel] [PATCH] netifd: Send DHCP release when client exits
hauke at hauke-m.de
Sun Apr 17 08:07:11 EDT 2016
On 03/31/2016 12:18 PM, Hans Dedecker wrote:
> Let DHCP client send a release when it exists so the DHCP server is
> informed the IP address is released and allowing to clean up IP/mac
> state info in intermediate devices.
> Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
I think in the normal case we should not send a release, so we can get
the IP address back later.
https://www.ietf.org/rfc/rfc2131.txt says in section 3.2 part 4.:
Note that in this case, where the client retains its network
address locally, the client will not normally relinquish its
lease during a graceful shutdown. Only in the case where the
client explicitly needs to relinquish its lease, e.g., the client
is about to be moved to a different subnet, will the client send
a DHCPRELEASE message.
What about making this configurable?
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