What are the advantages of Network file system (NFS)?

57.What are the advantages of Network file system (NFS)?
Ans.
1. NFS provides centralized control maintenance and administration.

2. It is easier to back up a file system stored on a single server than to backup files scattered across a network.

3. NFS provide access to shared disk space or limit access to sensitive data.

4. When NFS and NIS are used together, system wide configuration files can be modified instantly without visiting every machine.

5. NFS can conserve disk space and prevent duplication of resources.

6. When NFS is combined with NIS, users can also log in from any system, even remotely still have access to their home directories.

7. Users can protect sensitive information that would be time consuming to recreate by storing it on NFS mounted file system.

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Discuss security issues in Network File system.

71.Discuss security issues in Network File system. Ans. 1. NFS protocol version 3 and older have some security problems that make it unsuitable for use across the Internet and potentially unsafe for use even in trusted network. 2. One NFS weakness, in general terms, is the /etc/exports file, if a cracker is able to spoof or take over a trusted address, an address listed in /etc/exports then your exported NFS mount are accessible. 3. NFS has normal Linux file system access controls that take over once a client has mounted an NFS export, once this happens normal user and group permissions on the files take over access control. 4. The 1st way to defense is to use host access control, to limit access to services , particularly the portmapper, which has long been target of exploits attempts. 5. For this add the entries in /etc/hosts.clevy lockd, statd, mountd and rquoted. 6. Careful use of IS packet firewall, using netfilter, dramatically increases NFS server security. ...

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