I have a network running here on a Ubuntu server. A DHCP and a DNS server are running. I now have one Windows computer in that network and several computers with Ubuntu installed. I can ping and have access to its shared hard drives with some Ubuntu computers. However with two of the computers (including the server) I cannot connect to the Windows computer.
If I do an nmap
I can't find it. And I can't ping it.
As I did an arp -a -n
I could find it but that doesn't help me.
Looking forward to your help and sorry for my bad English.
EDIT:nmap -sn 192.168.2.0/24
did not work
sudo nmap 192.168.2.0/24
gave me
Nmap scan report for 192.168.2.21
Host is up (0.0018s latency).
Not shown: 987 filtered ports
PORT STATE SERVICE
16992/tcp closed amt-soap-http
49157/tcp open unknown
49158/tcp open unknown
49159/tcp closed unknown
49163/tcp closed unknown
50000/tcp closed ibm-db2
50300/tcp closed unknown
50636/tcp closed unknown
50800/tcp closed unknown
54328/tcp closed unknown
56738/tcp closed unknown
58080/tcp closed unknown
61900/tcp closed unknown
MAC Address: ***
winbind
?