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Closed
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Opened Nov 06, 2018 by Francis Dupont@fdupontDeveloper

ISC DHCP server config option always-broadcast

The always-broadcast statement

always-broadcast flag;

The DHCP and BOOTP protocols both require DHCP and BOOTP clients to set the broadcast bit in the flags field of the BOOTP message header. Unfortunately, some DHCP and BOOTP clients do not do this, and there- fore may not receive responses from the DHCP server. The DHCP server can be made to always broadcast its responses to clients by setting this flag to 'on' for the relevant scope; relevant scopes would be inside a conditional statement, as a parameter for a class, or as a parameter for a host declaration. To avoid creating excess broadcast traffic on your network, we recommend that you restrict the use of this option to as few clients as possible. For example, the Microsoft DHCP client is known not to have this problem, as are the OpenTransport and ISC DHCP clients.

Dubious idea in particular if there is no broken client requiring this hack. For documentation purpose only.

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Reference: isc-projects/kea#241