I use fqdn.fqdn:
subnet 192.168.4.0 netmask 255.255.255.0 {
ddns-updates on;
ddns-domainname "example.com";
option domain-name "example.com";
option fqdn.fqdn = concat(config-option
server.ddns-hostname, ".", config-option
server.ddns-domainname);
You didn't post hw_mac_short. You could use something like this:
ddns-hostname = concat("mta-",
binary-to-ascii(16, 8, "", substring(hardware, 4, 3)));
This uses the last three bytes of the MAC address.
Put this before the subnet definition.
Bill
On 8/30/2019 4:06 PM, Dave M wrote:
I have clients (eMTA) who request a hostname parameter. It
is easy to create static entries and provide clients with an
hostname back but I can't manage to do it dynamically.
I have the rest of my configuration working fine except
that one line:
subnet 172.16.52.0 netmask 255.255.254.0
{
allow leasequery;
option routers 172.16.53.254;
option broadcast-address 172.16.53.255;
option domain-name-servers 172.16.64.15 ;
ddns-hostname = concat("mta-", hw_mac_short);
ddns-domainname "
emta.lab.com.";
host-name = concat("mta-", hw_mac_short);
-----> not working
option domain-name "
emta.lab.com";
filename = concat("config/mta-", hw_mac_short,
".cfg");
pool
{
#pool: MTA 172.16.52.1 172.16.53.253
range 172.16.52.1 172.16.53.253;
allow members of "MTA";
}
}
If I hardcode the host-name, then the DDNS works fine and
gets created based on the mac (variable hw_mac_short) but I
can't figure out how to return option 12 dynamically to
clients requesting it.
I'm testing this on ISC DHCP 4.4.1
Is there a trick for that?
Dave M.
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