DHCP server failover behind relay

Simon Hobson dhcp1 at thehobsons.co.uk
Wed Sep 5 20:10:17 UTC 2012

Vadym Abramchuk wrote:

>Failover setup for isc-dhcpd is a well-known, however, both server 
>and clients MUST be in the same subnet


>So build-in failover does not work for relays.


You just need to configure your relay agents to forward to both 
servers. This can either be by sending two unicast packets (add two 
server addresses), or (I believe) if the network allows, sending one 
directed broadcast.

Simon Hobson

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