How to get clients to register and dynamically update BIND DNS server?

norwegiandemon · 01-30-2016, 09:52 PM

So I have a pretty standard setup: Home router (192.168.0.1) acting as a NAT, and DHCP server for all clients on my 192.168.0.0/24 network. I created a Debian server (192.168.0.2) with a static IP, and installed BIND using this guide.

Clients are using the server for lookups, forwarding is happening like a champ, caching looks like its working and my manually created A records resolve as well. I just can't get the clients to register dynamically...

In my named.conf.local I have my zone db files listed, they pass all checks, and /var/log/syslog shows they load just fine and I use the following in an attempt to get clients to register themselves: allow-update { 192.168.0.0/24;};
I've also given write permissions to the bind user/service itself to the db.* files...

I really don't want to setup a separate DHCP server instance (even if it's on the same host) because my router does a fine enough job and I'm not trying to over complicate things. I'm at a loss so any help would be appreciated.

paziulek · 01-31-2016, 02:25 AM

in the beginning of dhcpd.conf you will need something like:

Code:

ddns-update-style interim;
ddns-updates on;
ddns-domainname "home.local";
update-static-leases on;
key rndc-key { algorithm hmac-md5; secret "FxU11YBMFyXP8evP1Ei0zw==";}

and named.conf:

Code:

key "rndc-key" {
  algorithm hmac-md5;
  secret "FxU11YBMFyXP8evP1Ei0zw==";
};

with a couple of tweaks this should be it...
on the other hand, there is several good guides for DHCP/DNS integration. For more details/ or explanation check here at LQ or use your favorite search engine.

edit: you might not need to declare the 'key's ' - it is used for xfer's in HA setups for DHCPd pairs and BIND instances.

descendant_command · 01-31-2016, 04:50 AM

Quote:

Originally Posted by norwegiandemon

I'm not trying to over complicate things

Simple = turn off dhcp on your router and install dnsmasq on your server to do both dhcp & dns.