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dhcp: remove the address synchronously on lease expiry

Beniamino Galvani requested to merge bg/dhcp-remove-addr-on-expiry into main


When the lease expires, the DHCP client emits a LEASE_UPDATE event with a NULL l3cd. After returning from the handler, it sends immediately a DHCP DISCOVER message to try to get a new lease.

It is important that when the DISCOVER gets sent the address is no longer configured on the interface. Otherwise, the server could see that it is already in use and assign a different one. Therefore, remove the address synchronously when handling the event.

Fixes #1532 (closed)


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Edited by Íñigo Huguet

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