升级后的isc-dhcp-server并保持我的configuration我有一个奇怪的错误，如下面的日志：
Sep 21 20:02:03 asia isc-dhcp-server[24548]: key DDNS_UPDATE; Sep 21 20:02:03 asia isc-dhcp-server[24548]: ^ ping-check true; one-lease-per-client true; get-lease-hostnames true; update-conflict-detection false; ddns-updates on; ddns-update-style interim; update-static-leases on; allow unknown-clients; use-host-decl-names on; include "/etc/dhcp/rndc.key"; zone bunker.org. { primary localhost; key DDNS_UPDATE; } zone 1.168.192.in-addr.arpa. { primary localhost; key DDNS_UPDATE; } 并在这里login：
Sep 21 20:02:03 asia isc-dhcp-server[24548]: /etc/dhcp/dhcpd.conf line 30: unknown key DDNS_UPDATE Sep 21 20:02:03 asia isc-dhcp-server[24548]: key DDNS_UPDATE; Sep 21 20:02:03 asia isc-dhcp-server[24548]: ^ Sep 21 20:02:03 asia isc-dhcp-server[24548]: /etc/dhcp/dhcpd.conf line 35: unknown key DDNS_UPDATE Sep 21 20:02:03 asia isc-dhcp-server[24548]: key DDNS_UPDATE; Sep 21 20:02:03 asia isc-dhcp-server[24548]: ^
修改你的区域：
zone bunker.org. { primary 192.168.1.212; key rndc-key; } zone 1.168.192.in-addr.arpa. { primary 192.168.1.212; key rndc-key; }