VRRP should allow for a quick and easy way to implement a failover pair of dhcp servers without breaking poorly implemented DHCP clients (clients that won't re-broadcast the dhcp request when the renewing server doesn't respond).
However in order to implement keepalived, you have to enable nonlocal ip binding in the kernel: echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind It seems like Kea though, also doesn't like binding to a non-local IP. So if the other DHCP server fails, it can't seemlessly assume its role and needs to be reconfigured and restarted. This would be a great feature to implement especially in 1.4 as part of the HA feature set. As of right now, when I try to configure kea to listen on the standby IP (the IP the other server is currently using), I get: DHCP4_INIT_FAIL failed to initialize Kea server: configuration error using file '/etc/kea/kea-dhcp4.conf': Failed to select interface: interface 'eth0' doesn't have address '172.31.0.1' assigned (/etc/kea/kea-dhcp4.conf:18:41) (/etc/kea/kea-dhcp4.conf:18:5) -- Munroe Sollog Senior Network Engineer mun...@lehigh.edu
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