BIND DHCP dynamic update reverse zone if algin is non octet problem

[milew]

Hello
I have installed BIND package on pfSense 2.6 community on my testing evironment Hyper-V machine.

My WAN is from DHCP my ISP provider.
My LAN is 192.168.192.1/18 DHCP
My DHCP server scope 192.168.192.100-192.168.192.200,
Enable registration of DHCP client names in DNS. DDNS domain example.com.

/var/dhcpd/etc/dhcpd.conf has section
zone 192-255.168.192.in-addr.arpa. {
primary 192.168.192.1;
key "rndc-key";
}

My client is Windows 10 DHCP enabled.

If my client release and renev ipaddres DHCP log
Added new forward map from DESKTOP-GBII3C8.example.com to 192.168.192.100
not add to reverse zone.

BIND configuration reverse zone from /var/etc/named/etc/namedb/named.conf

zone "168.192.in-addr.arpa" {
		type master;
		file "/etc/namedb/master/default/168.192.DB";
		allow-query { any; localhost; localnets; };
		allow-transfer { any; localhost; localnets; };
		allow-update { any; };
	};

File zone /var/etc/named/etc/namedb/master/default/168.192.DB

$TTL 43200
;
$ORIGIN 168.192.in-addr.arpa.

;	Database file 168.192.DB for 168.192 zone.
;	Do not edit this file!!!
;	Zone version 2664371513
;
@	 IN  SOA 192.168.192.1. 	 zonemaster.168.192. (
		2664371513 ; serial
		1d ; refresh
		2h ; retry
		4w ; expire
		1h ; default_ttl
		)

;
; Zone Records
;
	 IN NS 	192.168.192.1.
1.192 	 IN PTR  	router.example.com.

When I change LAN addresation to 192.168.0.1/16 DHCP adds record to reverse zone correctly.

What is wrong?
Is any solutions for my problem?

[Gertjan]

@milew

Is it possible not to use /16 or worse, use /18 ?
Your pool is only "100" wide. Do you relly need a 254 x 254 x 4 => 260k network ?
Use a /24 "like everybody else" and call it a day ;)

[johnpoz]

@milew you can only use /24 or /16 or /8 for reverse zones.

There is a bit of hack and cnames for smaller then /24s see rfc 2317

If you have say a /22, this would be 4 different /24 zones.

[milew]

@gertjan I need more adresses than /24
my pool 100 is only for test.

[johnpoz]

@milew see my post, use multiple /24 zones, or just use a /16.. Its not like with rfc1918 there is going to be any other place authoritative for parts of the /16 your not using.

[milew]

@johnpoz I remove reverse zone 168.192.in-addr.arpa
and add
192.168.192.in-addr.arpa
zone file /var/etc/named/etc/namedb/master/default/192.168.192.DB

$TTL 43200
;
$ORIGIN 192.168.192.in-addr.arpa.

;	Database file 192.168.192.DB for 192.168.192 zone.
;	Do not edit this file!!!
;	Zone version 2664446401
;
@	 IN  SOA router.example.com. 	 zonemaster.192.168.192. (
		2664446401 ; serial
		1d ; refresh
		2h ; retry
		4w ; expire
		1h ; default_ttl
		)

;
; Zone Records
;
	 IN NS 	router.example.com.
1 	 IN PTR  	router.example.com.

and /var/etc/named/etc/namedb/named.conf

#Do not edit this file!!!

 key "rndc-key" {
 	algorithm hmac-sha256;
 	secret "W1+lueh/DCHHqUxXe9j+bfD+p48yqCgcZUEjeAoZ/Rs=";
 };

 controls {
 	inet 127.0.0.1 port 8953
 		allow { 127.0.0.1; } keys { "rndc-key"; };
 };



options {
	directory "/etc/namedb";
	pid-file "/var/run/named/pid";
	statistics-file "/var/log/named.stats";
	max-cache-size 384M;
	dnssec-validation auto;

	listen-on-v6 port 53 { any; };
	listen-on port 53 { any; };
	
};


logging {
	channel custom {
		syslog daemon;
		print-time no;
		print-severity yes;
		print-category yes;
		severity debug 5;
		};
	category update { custom; };
};

view "default" { 
	recursion yes;
	match-clients { any; };
	allow-recursion { any; };

	zone "example.com" {
		type master;
		file "/etc/namedb/master/default/example.com.DB";
		allow-query { any; localhost; localnets; };
		allow-transfer { any; localhost; localnets; };
		allow-update { any; localhost; localnets; };
	};

	zone "192.168.192.in-addr.arpa" {
		type master;
		file "/etc/namedb/master/default/192.168.192.DB";
		allow-query { any; };
		allow-transfer { any; };
		allow-update { any; };
	};

	zone "." {
		type hint;
		file "/etc/namedb/named.root";
	};

};

and working

Sep 29 10:18:10 dhcpd 14875 Added reverse map from 100.192.168.192.in-addr.arpa. to DESKTOP-GBII3C8.example.com
Sep 29 10:18:10 dhcpd 14875 Added new forward map from DESKTOP-GBII3C8.example.com to 192.168.192.100

@johnpoz Thank you very much.