<div dir="ltr">Here's something I use when hosts don't send a hostname.<div>In global options:<br></div><div><div><br></div><div>ddns-hostname = pick (option fqdn.hostname, option host-name, concat ("ddns-", binary-to-ascii (10, 8, "-", leased-address)));</div><div>option host-name = config-option server.ddns-hostname;<br></div></div><div><br></div><div>Resulting ddns hostname is ddns-xxx-xxx-xxx-xxx.domain_name</div><div><br></div><div>Edit to suit.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 22, 2016 at 1:48 PM, <span dir="ltr"><<a href="mailto:durwin@mgtsciences.com" target="_blank">durwin@mgtsciences.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font size="2" face="sans-serif">I have some embedded devices with minimal
OS. I am not sure the DHCP client has compiled ability to send hostname.
I have seen this used while searching for help on this subject.</font>
<br>
<br><font size="2" face="sans-serif">host e2rb_004 {</font>
<br><font size="2" face="sans-serif"> option
host-name "e2rb_004";</font>
<br><font size="2" face="sans-serif"> ddns-hostname
"e2rb_004";</font>
<br><font size="2" face="sans-serif"> hardware
ethernet 00:10:60:31:b2:a0;</font>
<br><font size="2" face="sans-serif"> fixed-address
172.23.93.38;</font>
<br><font size="2" face="sans-serif">}</font>
<br>
<br>
<br><font size="2" face="sans-serif">This does not add the hostname in DNS.
My configuration does work as a normal DDNS. Any machine which
sends it's hostname when requesting an IP *does* get added into DNS records.
What I would like to do is to handle those embedded devices which
do *not* send hostname.</font>
<br>
<br><font size="2" face="sans-serif">Here is the DHCPD options.</font>
<br>
<br>
<br><font size="2" face="sans-serif">=== dhcpd.conf ===</font>
<br><font size="2" face="sans-serif">authoritative;</font>
<br>
<br><font size="2" face="sans-serif">ddns-update-style interim;</font>
<br><font size="2" face="sans-serif">ddns-updates on;</font>
<br><font size="2" face="sans-serif">ddns-domainname "<a href="http://mydomain.com" target="_blank">mydomain.com</a>";</font>
<br><font size="2" face="sans-serif">ddns-rev-domainname "in-addr.arpa.";</font>
<br><font size="2" face="sans-serif">update-static-leases on;</font>
<br><font size="2" face="sans-serif">ignore client-updates;</font>
<br><font size="2" face="sans-serif">one-lease-per-client true;</font>
<br>
<br><font size="2" face="sans-serif"># WPAD definition</font>
<br><font size="2" face="sans-serif">option wpad code 252 = text;</font>
<br>
<br><font size="2" face="sans-serif">key MSI_DHCPD_UPDATER {</font>
<br><font size="2" face="sans-serif"> algorithm hmac-md5;</font>
<br><font size="2" face="sans-serif"> secret "mysecret";</font>
<br><font size="2" face="sans-serif">};</font>
<br>
<br><font size="2" face="sans-serif">zone <a href="http://mydomain.com" target="_blank">mydomain.com</a>. {</font>
<br><font size="2" face="sans-serif"> primary 127.0.0.1;</font>
<br><font size="2" face="sans-serif"> key MSI_DHCPD_UPDATER;</font>
<br><font size="2" face="sans-serif">}</font>
<br>
<br><font size="2" face="sans-serif">zone 93.23.172.in-addr.arpa. {</font>
<br><font size="2" face="sans-serif"> primary 127.0.0.1;</font>
<br><font size="2" face="sans-serif"> key MSI_DHCPD_UPDATER;</font>
<br><font size="2" face="sans-serif">}</font>
<br>
<br><font size="2" face="sans-serif">subnet 172.23.93.0 netmask 255.255.255.0
{</font>
<br><font size="2" face="sans-serif"> option routers
172.23.93.1;</font>
<br><font size="2" face="sans-serif"> option wpad "\n\000";</font>
<br><font size="2" face="sans-serif"> option subnet-mask
255.255.255.0;</font>
<br><font size="2" face="sans-serif"> option domain-name
"<a href="http://mydomain.com" target="_blank">mydomain.com</a>";</font>
<br><font size="2" face="sans-serif"> option domain-name-servers
172.23.93.3,172.23.93.9,198.<wbr>59.115.2;</font>
<br><font size="2" face="sans-serif"> option time-offset
-25200; # Mountain Standard Time</font>
<br><font size="2" face="sans-serif"> range dynamic-bootp 172.23.93.95
172.23.93.249;</font>
<br><font size="2" face="sans-serif"> default-lease-time 57600;</font>
<br><font size="2" face="sans-serif"> max-lease-time 57600;</font>
<br><font size="2" face="sans-serif"> min-lease-time 57600;</font>
<br><font size="2" face="sans-serif"> ddns-domainname "<a href="http://mydomain.com" target="_blank">mydomain.com</a>";</font>
<br><font size="2" face="sans-serif">}</font>
<br>
<br>
<br><font size="2" face="sans-serif">Any advice is appreciated. Thank
you.</font>
<br>
<br>
<br><font size="2" face="sans-serif"><br>
Durwin F. De La Rue<br>
Management Sciences, Inc.<br>
6022 Constitution Ave. NE<br>
Albuquerque, NM 87110<br>
Phone <a href="tel:%28505%29%20255-8611" value="+15052558611" target="_blank">(505) 255-8611</a><br>
<br>
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