DDNS - limitation and excluding updates from certain networks

Reindl Harald h.reindl at thelounge.net
Wed Dec 27 20:38:51 UTC 2017

Am 27.12.2017 um 21:31 schrieb MAYER Hans:
> Many thanks. Yes, that’s exactly what I am looking for.
> I have  "ddns-update-style interim;”
> But what do you mean with "static entry” ?
> For example my "static entries” are all servers.
> But the server don’t have any DHCP entries. The IP addresses of the interfaces are “hard wired” *is not* in "range" but when MAC 
00:A0:96:9C:14:1C would ask for a dhcpd IP it would get

that are static entries, it's that simple

[root at srv-rhsoft:~]$ cat /etc/dhcp/dhcpd.conf
ddns-update-style none;
ddns-updates off;
default-lease-time 86400;
max-lease-time 259200;
log-facility local7;

option rfc3442-classless-static-routes code 121 = array of integer 8;
option ms-classless-static-routes code 249 = array of integer 8;

subnet netmask {
  option domain-name "rhsoft.net";
  option domain-name-servers;
  option routers;
  option smtp-server;
  option pop-server;
  option ntp-servers;
  option time-servers;
  option subnet-mask;
  option broadcast-address;
  option interface-mtu 1444;

host blueray {
  hardware ethernet 00:A0:96:9C:14:1C;

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