[Samba] Problem in viewing server hostname when browsing network

[Lorenzo Milesi]

I've setup a Ubuntu16.04 server with Samba 4.3.11+dfsg-0ubuntu0.16.04.23. 
Everything works fine except for a little problem with reverse "name resolution": when browsing computer in the networks the server is displayed as IP address instead of the configured hostname. All the PCs are displayed with name, only the server has the IP. [1]
Accessing the server via \\hostname works perfectly.
It looks like a DNS problem, but I didn't manage to find out the problem. Any hint on where to look at would be helpful, thanks.

Samba config:
[global]
    server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbindd, ntp_signd, kcc, dnsupdate
    realm = domain.lan
    ldap server require strong auth = no
    netbios name = SERVER7
    workgroup = DOMAIN
    server role = active directory domain controller
    log level = 5
    idmap_ldb:use rfc2307 = yes
    log file = /var/log/samba/log.%m
    ea support = yes
[users]
    path = /home/users/
    read only = no
[profiles]
    comment = Users profiles
    path = /home/profiles
    read only = no
    browsable = no


BIND is configured manually. This is the BIND config for the 10.0.0 zone:

$TTL    86400
@       IN      SOA     samba.domain.lan samba.domain.lan (
                        1997022705
                        28800
                        14400
                        3600000
                        86400 )
              NS      samba.server7.
              NS      samba.domain.lan.
              NS      server01.domain.com.
              NS      mailing.domain.com.
;              IN      NS      10.0.0.7
2                   PTR     server02.domain.com.
14                  PTR     mailing.domain.com.
7.0.0.10.in-addr.arpa.  IN      PTR     server7.

It happens from all computers.
 
C:\Users\administrator.DOMAIN>nslookup server7.domain.lan
Server:  samba.domain.lan
Address:  10.0.0.7

Nome:    server7.domain.lan
Addresses:  10.0.0.7
          192.168.0.7

C:\Users\administrator.DOMAIN>nslookup 10.0.0.7
Server:  server7
Address:  10.0.0.7

Nome:    server7
Address:  10.0.0.7

C:\Users\administrator.DOMAIN>ipconfig /all

Configurazione IP di Windows

   Nome host . . . . . . . . . . . . . . : VM01W7
   Suffisso DNS primario . . . . . . . . : domain.lan
   Tipo nodo . . . . . . . . . . . . . . : Ibrido
   Routing IP abilitato. . . . . . . . . : No
   Proxy WINS abilitato . . . . . . . .  : No
   Elenco di ricerca suffissi DNS. . . . : domain.lan

Scheda Ethernet Connessione alla rete locale (LAN):

   Suffisso DNS specifico per connessione:
   Descrizione . . . . . . . . . . . . . : Connessione di rete Intel(R) PRO/1000 MT
   Indirizzo fisico. . . . . . . . . . . : 00-C1-44-71-14-CD
   DHCP abilitato. . . . . . . . . . . . : No
   Configurazione automatica abilitata   : Sì
   Indirizzo IPv4. . . . . . . . . . . . : 10.0.0.112(Preferenziale)
   Subnet mask . . . . . . . . . . . . . : 255.255.255.0
   Gateway predefinito . . . . . . . . . : 10.0.0.250
   Server DNS . . . . . . . . . . . . .  : 10.0.0.7
   Server WINS primario . . . . . . . .  : 10.0.0.7
   NetBIOS su TCP/IP . . . . . . . . . . : Attivato





[1] https://i.stack.imgur.com/lS9sC.png

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Lorenzo Milesi - lorenzo.milesi at yetopen.it

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