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Since an Ubuntu machine needs an smb client to access a smb server, it would have to establish a connection to the server. What ports does the client open to establish the connection? Do those ports continue to listen for incoming connections once the connection to the smb server ends? Note: I am asking about the ports used by a smb client, not a smb server. |
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This is from https://wiki.samba.org/index.php/Samba_port_usage Identify on which ports and interfaces Samba is listening You can use "netstat" to identify which ports Samba and related daemons are listening on and on which IPs: netstat -tulpn | egrep "samba|smbd|nmbd|winbind"The following is a snippet of an example output: tcp 0 0 127.0.0.1:139 0.0.0.0:* LISTEN 43270/smbd ..... The above example shows, that the services are listening on localhost (127.0.0.1) and the interface with IP 10.0.0.1 - each on the listed ports (139, 88, 445,...). Port usage when Samba runs as an Active Directory Domain Controller Service Port protocol DNS 53 tcp/udp Kerberos 88 tcp/udp End Point Mapper (DCE/RPC Locator Service) 135 tcp NetBIOS Name Service 137 udp NetBIOS Datagram 138 udp NetBIOS Session 139 tcp LDAP 389 tcp/udp SMB over TCP 445 tcp Kerberos kpasswd 464 tcp/udp LDAPS (only if "tls enabled = yes") 636 tcp Dynamic RPC Ports* 1024-5000 tcp Global Cataloge 3268 tcp Global Cataloge SSL (only if "tls enabled = yes") 3269 tcp Multicast DNS 5353 tcp/udp
Port usage when Samba runs as an NT4 Primary Domain Controller Service Port protocol End Point Mapper (DCE/RPC Locator Service) 135 tcp NetBIOS Name Service 137 udp NetBIOS Datagram 138 udp NetBIOS Session 139 tcp SMB over TCP 445 tcp Port usage when Samba runs as a Member Server Service Port protocol End Point Mapper (DCE/RPC Locator Service) 135 tcp NetBIOS Name Service 137 udp NetBIOS Datagram 138 udp NetBIOS Session 139 tcp SMB over TCP 445 tcp |
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