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--- quay:dhcp [2020-05-18 15:19] – created gabriel
+++ quay:dhcp [2020-05-18 19:05] (current) – systemd and IPv6 bug gabriel
@@ Line 2: / Line 2: @@
 I run the [[https://www.isc.org/dhcp/|ISC DHCP Server]] service on my local network in a reduntant configuration for assigning addresses dynamically.  This page documents this usage.
+===== Configuration =====
+Both servers are configured as failover peers.  beowulf.in.quay.net is the primary, grendel.in.quay.net is secondary.
+To ensure that we don't try to serve IPv6 addresses (and to work around an issue with the systemd unit), configure the interface explictly in ''/etc/default/isc-dhcp-server'' by adding an interface to the following variable that is empty by default:
+<code>
+INTERFACESv4="eth0"
+</code>
+Provided that IPv6 is disabled via sysctl then this will work correctly.
+Static leases are stored in a separate ''static-leases.conf'' file that should be updated on both servers using [[ansible|Ansible]].
+Start the service thusly:
+<code>
+systemctl enable isc-dhcp-server
+systemctl start isc-dhcp-server
+</code>