DHCP server to handle hostname.

[Rick Dicaire]

Here's something I use when hosts don't send a hostname.
In global options:

ddns-hostname = pick (option fqdn.hostname, option host-name, concat
("ddns-", binary-to-ascii (10, 8, "-", leased-address)));
option host-name = config-option server.ddns-hostname;

Resulting ddns hostname is ddns-xxx-xxx-xxx-xxx.domain_name

Edit to suit.

On Thu, Sep 22, 2016 at 1:48 PM, <durwin at mgtsciences.com> wrote:

> 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.
>
> host e2rb_004 {
>         option host-name "e2rb_004";
>         ddns-hostname "e2rb_004";
>         hardware ethernet 00:10:60:31:b2:a0;
>         fixed-address 172.23.93.38;
> }
>
>
> 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.
>
> Here is the DHCPD options.
>
>
> === dhcpd.conf ===
> authoritative;
>
> ddns-update-style interim;
> ddns-updates on;
> ddns-domainname "mydomain.com";
> ddns-rev-domainname "in-addr.arpa.";
> update-static-leases on;
> ignore client-updates;
> one-lease-per-client true;
>
> # WPAD definition
> option wpad code 252 = text;
>
> key MSI_DHCPD_UPDATER {
>     algorithm hmac-md5;
>     secret "mysecret";
> };
>
> zone mydomain.com. {
>     primary 127.0.0.1;
>     key MSI_DHCPD_UPDATER;
> }
>
> zone 93.23.172.in-addr.arpa. {
>     primary 127.0.0.1;
>     key MSI_DHCPD_UPDATER;
> }
>
> subnet 172.23.93.0 netmask 255.255.255.0 {
>     option routers          172.23.93.1;
>     option wpad "\n\000";
>     option subnet-mask      255.255.255.0;
>     option domain-name      "mydomain.com";
>     option domain-name-servers  172.23.93.3,172.23.93.9,198.59.115.2;
>     option time-offset      -25200; # Mountain Standard Time
>     range dynamic-bootp 172.23.93.95 172.23.93.249;
>     default-lease-time 57600;
>     max-lease-time 57600;
>     min-lease-time 57600;
>     ddns-domainname "mydomain.com";
> }
>
>
> Any advice is appreciated.  Thank you.
>
>
>
> Durwin F. De La Rue
> Management Sciences, Inc.
> 6022 Constitution Ave. NE
> Albuquerque, NM  87110
> Phone (505) 255-8611
>
>
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