Jde mi o to, aby ns1.example.com dokázal resolvovat subdoménu "foo". Aktuálně mi odpovídá NXDOMAIN.

Konfigurace ns2.example.local (ns1.foo.example.local) ale bylo to vidět i z digu

$TTL    60

@       IN      SOA     ns1.foo.example.local. admin.example.com. (
                              3         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
; name servers - NS records
@                               IN      NS      ns1.foo.example.local.
; name servers - A records
ns1                             IN      A       192.168.0.10

; foo.example.local - A records
@                               IN      A       192.168.0.10

Pro ns2 to funguje dle očekávání

# nslookup foo.example.local ns1.example.local
Server:         ns1.example.local
Address:        192.168.0.135#53

** server can't find foo.example.local: NXDOMAIN

# nslookup foo.example.local ns2.example.local
Server:         ns2.example.local
Address:        192.168.0.10#53

Name:   foo.example.local
Address: 192.168.0.10