Chapter 6 FTP File and Print Server A

Chapter 6 FTP, File and Print Server A System Administration Perspective Network and System Administration 1

What is FTP • FTP is short for File Transfer Protocol. • It is used to transfer files between an FTP server and another computer. • FTP also tends to be faster than other contemporary methods of transferring files because it was designed to do so. • Two roles during file transfer: § FTP Server: Hosts the service § FTP Client: uploads/downloads files to/from FTP Server • FTP support Automatic Resume. Network and System Administration 2

How to connect to FTP Server • Two approaches exist to connect to FTP Server: § The first is to make it so anyone can log in anonymously, otherwise known as anonymous FTP, or ü Example: ftp: //movies. ambou. edu. et § Assign user names and passwords to people that they must use to log in to the server. ü Example: ftp: //username: password@movies. ambou. edu. et § It is also possible to use FTP client that is designed specifically to connect to FTP servers. ü These types of software generally the best as they have been streamlined for speed and support a lot of the advanced features like automatic resume. ü Example: File. Zilla, Fire FTP, Win. SCP Network and System Administration 3

Samba: An Introduction • The main essence of computer network is to share information and resource. • File is among the resource users can share on the network. § File sharing should be transparent to heterogeneity in platforms in the network § Windows, Unix, Mac, …. . • Domain based windows network doesn’t communicate with Linux/Mac machines. • Network and System Administration 4

Samba… • Samba is an Open Source/Free Software suite that provides seamless file and print services to SMB/CIFS clients. § Samba is freely available, unlike other SMB/CIFS implementations, and allows for interoperability between Linux/Unix servers and Windows-based clients § Samba uses the TCP/IP protocol that is installed on the host server. § When correctly configured, it allows that host to interact with a Microsoft Windows client or server as if it is a Windows file and print server. § It uses SMB/CIFS (Server Message Block/Common Internet File System) protocol. Network and System Administration 5

What Samba Does • Samba implement the four basic modern-day CIFS services. § § File & print services Authentication and Authorization Name resolution Service announcement (browsing) Network and System Administration 6

What Samba…. • File and print services are the cornerstone of the CIFS suite. § File sharing, Print Sharing • It also handles share mode and user mode authentication and authorization. § One can protect shared file and print services by requiring passwords. ü In share mode, password can be assigned to a shared directory or printer. ü With user mode authentication, each user has their own username and password. Network and System Administration 7

What Samba…. • Name resolution takes two forms: broadcast and point-to -point. § In broadcast, a client looking for a service will call out with the service name and wait for the machine with that name to answer with an IP address. § In point-to-point which uses NBNS (Net. Bios Name Service), services will keep their name and associated IP Address. ü The clients send their Net. BIOS names & IP addresses to the NBNS server • Browsing maintains browsable list of services (file and print shares) offered by the computers on a network. Network and System Administration 8

What Samba…. • Service announcement (browsing) is handled by Local Master Browser (LMB). § The LMBs job is to keep a list of available services § LMB is voted by the participating PCs in the LAN. § In addition to LMBs, there are Domain Master Browsers (DMBs). ü DMBs coordinate browse lists across NT Domains, even on routed networks Network and System Administration 9

Samba Utilities • Samba comes with a variety of utilities. The most commonly used are: § smbclient ü A simple SMB client, with an interface similar to that of the FTP utility. ü It can be used from a Unix system to connect to a remote SMB share, transfer files, and send files to remote print shares (printers). § nmblookup ü It can be used to find Net. BIOS names on a network, lookup their IP addresses, and query a remote machine for the list of names the machine believes it ownes. § swat ü The Samba Web Administration Tool. Swat allows you to configure Samba remotely, using a web browser. Network and System Administration 10