Can you Force DDNS names to Lower Case?

Glenn Satchell Glenn.Satchell at
Fri Nov 13 22:36:12 UTC 2009

You can use the lcase() function in an appropriate scope. You probably
want this, or something similar, in the global scope.

	option ddns-hostname = lcase (option ddns-hostname);

Glenn Satchell                            |  Miss 9: What do you
Uniq Advances Pty Ltd, Sydney Australia   |  do at work Dad?
mailto:glenn.satchell at         |  Miss 6: He just tel:0409-458-580   |  types random stuff.

>Date: Fri, 13 Nov 2009 13:42:27 -0600
>From: Martin McCormick <martin at>
>	Is it possible to cause dynamic DNS name registrations
>to always be in lower case? This is normally not a problem, but
>it makes trouble-shooting interesting at times when clients give
>their system a name like Bobs-PC which resolves, of course, to
>	We set up some private networks with default domain
>names of wifi-atrc or wifi-su for certain buildings on our
>campus and I am seeing names like WiFi-ATRC.osu in zone
>transfers. I am mystified as to how the names are becoming
>mixed-case again. I might expect the host part of the name to be
>mixed-case, but one would expect the forward lookup of the
>default domain name to be whatever one set it to be. I have
>checked more than once to make sure that
>A.  We have the right names in our dhcpd.conf file and
>B.  Dhcpd was started recently so is not running on an old
>	Here is an example of one of the problem networks. We
>have several others that never seem to show mixed-case domain
>subnet netmask {
>option subnet-mask;
>option routers;
>ddns-updates on;
>option domain-name "wifi-atrc.osu";
>option broadcast-address;
>default-lease-time 14400;
>max-lease-time 14400;
> pool {
>deny dynamic bootp clients;
>failover peer "stw";
>} #end network
>	This particular zone is loaded with WiFi-ATRC.osu names.
>Thanks for any ideas.
>Martin McCormick WB5AGZ  Stillwater, OK 
>Systems Engineer
>OSU Information Technology Department Telecommunications Services Group
>dhcp-users mailing list
>dhcp-users at

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