Nfs (Network File System)

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NFS (Network File system)
NFS protocol was developed by SUN microsystems using UNIX. NFS allows severs to share local directories with client systems. NFS runs on UNIX, DOS, Microsoft, VMS, Linux and more. NFS allows a client to access files on a remote server. The client user is usually unaware on the storage location on the file they are using. NFS reduces the storage needs used on the client and aids in the administration work load.
With an NFS the file system stored on a remote server and the directory is shared over a local network. The server has a large capacity disk drive and device so that copies for file can be backed up with a problem. Diskless systems boot from the file server and load the system from a fileserver. Because a diskless client doesn’t require much to run a file server system you can use older machine as clients.
Other options for NFS for Linux are netboot and dataless system. Netboot uses TFTP (Trivial File Transfer Protocol) that runs PXE (Preboot Execution Environment) a boot server for Intel. Dataless systems allow the user to store all files remotely but only Linux based applications can be kept on the disk.
IPtables are composed of two components netfilter and IPtables. Netfilter a set of tables that hold rules the kernel uses to control network packet filtering. IPtables set up, maintain, and displays the rules stored by netfilter. Rules use one more categories matches or classified with single action. The rule that applies to the network packet is matched using the categories and action is applied to packet. Rules are store in chains. Each rule in a chain is applied, in the order, to the packet until a match is found. In the kernel IPtables replaces the earlier Ipchains as a method of filtering network packets. It provides multiple chains for increased filtration flexibility. IPtables requires elevated privileges to…...

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