DHCP v4.2.5 - How to manage hostname ?

Bill Shirley Bill at Henagar.PolymerIndustries.biz
Thu Sep 24 01:51:58 UTC 2015


Here are couple of working examples using hardware address:
# ------------------------------------------------------------------------------
class "Pack.1"  {
         match hardware;
         set member_of = "Pack.1";
         option log-servers      10.96.0.9;
         option domain-name      "pack1.example.com";
         ddns-domainname         "pack1.example.com";
}
subclass "Pack.1"       1:00:01:E6:50:AD:0B     { ddns-hostname = "ln1prt01"; }         # ln1prt01 - 2014-09-15
subclass "Pack.1"       1:00:1B:78:E6:A7:91     { ddns-hostname = "ln1lbl01"; }         # ln1lbl01
# ------------------------------------------------------------------------------

# ------------------------------------------------------------------------------
# create a name for DNS if client doesn't send a hostname
class "NoName" {
         match if not (
                 exists server.ddns-hostname
                 or exists fqdn.hostname
                 or exists host-name
         );
         set member_of = "NoName";

         ddns-hostname = concat("NoName-", binary-to-ascii(16, 8, "", substring(hardware, 4, 3)));
         option dhcp.host-name = config-option server.ddns-hostname;
         option fqdn.hostname = config-option server.ddns-hostname;
}
# ------------------------------------------------------------------------------

Then inside the subnet declaration:
#               ----------------------------------------------------------------
                 pool {
                         failover peer "dhcp-failover";
                         set pool_type = "Pack.1";
                         allow members of "Pack.1";
                         deny dynamic bootp clients;
                         option routers          10.96.0.9;
                         range 10.100.1.32       10.100.1.253;
                 }
# 		----------------------------------------------------------------


ddns-hostname is what you want to set so that it will update the DNS.

Bill


On 9/22/2015 5:03 AM, Jacques Grillot wrote:
> Bonjour everyone,
>
> I work for a company that supplies services around connected devices.
>
> I build a new infrastructure for our customers  in which there is a DHCP server (v4.2.5 provides by Centos 7.1).
>
> I need these devices register dynamically with a hostname in our DNS.
>
> The constraint is that many devices send no information concerning their hostname (in fact, they have not this information).
>
> What I whished was to use « host-identifier » option (which is the MSISDN, that is the phone number of the device) and use it as
> a parameter to build a hostname.
>
> I groped a little bit at random and I thought of finding a solution with the conditional instructions but it dosn’t work either.
>
> This in one configuration file (/etc/dhcp/subnets/customer001.conf :
>
> ----- BEGIN -----
>
> shared-network customer001 {
>
>          if exists dhcp-client-identifier {
>
>                  option dhcp-client-identifier = option dhcp-client-identifier;
>
>          }
>
>          if exists host-name {
>
>                  option host-name = option host-name;
>
>          }
>
>          else if exists dhcp-client-identifier {
>
>                  option host-name = option dhcp-client-identifier;
>
>          }
>
>          zone device.m2m. {
>
>                  primary 10.0.0.211;
>
>                  secondary 10.0.0.212, 10.0.0.216;
>
>                  key DDNS_UPDATE;
>
>          }
>
>          zone 10.in-addr.arpa. {
>
>                  primary 10.0.0.211;
>
>                  secondary 10.0.0.212, 10.0.0.216;
>
>                  key DDNS_UPDATE;
>
>          }
>
>          deny unknown-clients ;
>
>          ddns-rev-domainname "in-addr.arpa.";
>
>          ddns-updates on;
>
>          ddns-update-style interim;
>
>          ignore client-updates;
>
>          infinite-is-reserved on;
>
>          do-forward-updates on;
>
>          option domain-name-servers 10.0.0.211, 10.0.0.212;
>
>          update-static-leases on;
>
>          use-host-decl-names on;
>
>          ddns-domainname "device.m2m.";
>
>          default-lease-time 604800;
>
>          max-lease-time 604800;
>
>          subnet 10.1.0.0 netmask 255.255.0.0 {
>
>                  range 10.1.0.2 10.1.255.250;
>
>                  option routers 10.1.255.252;
>
>                  option subnet-mask 255.255.0.0;
>
>                  option broadcast-address 10.1.255.255;
>
>          }
>
>          subnet 10.129.0.0 netmask 255.255.0.0 {
>
>                  range 10.129.0.2 10.129.255.250;
>
>                  option routers 10.129.255.252;
>
>                  option subnet-mask 255.255.0.0;
>
>                  option broadcast-address 10.129.255.255;
>
>          }
>
> }
>
> host 00033611987141 {
>
>          if exists host-name {
>
>                  option host-name = option host-name;
>
>          }
>
>          else if exists dhcp-client-identifier {
>
>                  option host-name = option dhcp-client-identifier;
>
>          }
>
>          fixed-address 10.1.0.3;
>
>          option dhcp-client-identifier "\00033123456789";
>
> }
>
> host 00033625232212 {
>
>          if exists host-name {
>
>                  option host-name = option host-name;
>
>          }
>
>          else if exists dhcp-client-identifier {
>
>                  option host-name = option dhcp-client-identifier;
>
>          }
>
>          fixed-address 10.1.0.4;
>
>          option dhcp-client-identifier "\000330987654321";
>
> }
>
> ----- END -----
>
> Some help will be appreciate J
>
> Regards,
>
> Jacques
>
> *Jacques GRILLOT*
> Administrateur Réseaux et Systèmes
> +33 (0) 4 88 36 07 52
> +33 (0) 6 08 33 06 02
>
> cid:part1.09070605.03080102 at matooma.com <http://www.matooma.fr/>
>
> 	
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