BIND - delegate a sub domain for a zone.

README.md

BIND - delegate a sub domain for a zone

The scenario:

• DNS zone myzone.com defined in BIND.
• Authoritative name server at 123.16.123.1.
• Subzone sub.myzone.com with an authoritative name server at 123.16.123.10.
• Wishing to forward sub-zone to authoritative name server.

Config

$ORIGIN myzone.com.
$TTL 1D
@ IN SOA ns1.myzone.com. hostmaster.myzone.com. (
	2015010100  ; serial
	21600       ; refresh
	3600        ; retry
	604800      ; expire
	86400 )     ; minimum TTL
;
@		IN  NS  ns1
ns1		IN  A   123.16.123.1	; glue record
ns1sub	IN	A	123.16.123.10	; glue record
;
;
$ORIGIN sub.myzone.com.
$TTL 1D
@		IN  NS  ns1sub.myzone.com.

How it works

• Resolver asks for answer to foo.sub.myzone.com from name server.
• Via sub.myzone.com zone, is given answer of ns1sub.myzone.com as the authoritative name server.
• Resolver able to resolve IP address of 123.16.123.10 for ns1sub.myzone.com via parent zone A "glue" record.
• Now resend original query of foo.sub.myzone.com to nameserver server at 123.16.123.10.
• All done.

Reference

• http://www.zytrax.com/books/dns/ch9/delegate.html