Skip to main content

Explain how to set an alias for the NIC.

By
45.Explain how to set an alias for the NIC.
Ans.
1. It is possible to assign more than one IP address to a single NIC, these addresses are called as aliases.

 2. This is achieved by using the ifconfig and route commands, to add another IP address, 192.168.166.56, to eth0, we have to execute these commands:
#ifconfig eth0:1 192.168.166.56
#route addr – host 192.168.166.56

 3. The first command binds the IP address to virtual interface eth0:1 and the second command adds a route for the address to the actual device eth0.

 4. Another method is adding second IP address to a single NIC by creating an alias file.

 5. The configuration file for device eth0 is /etc/sysconfig /nwtwork-scripts/ifcfg-eth0

 6. The above file is copied to another file called ifcfgeth0:1 in the same directory.

 7. We need to open the newly copied file and change the line that reads:
DEVICE= eth0 to DEVICE=eth0:1

 8. The service of network is restarted for above changes to be affected, these effects are permanent.

Labels:

Comments

Post a Comment

Popular posts from this blog

Explain the tools used to monitor system security.

By
12.Explain the tools used to monitor system security. Ans. 1. People who, for purpose of larceny or to amuse themselves, like to break into computers, they are called ‘crackers’. 2. If there is a vulnerability in a system they will find it and use it against you. 3. Preventing use of your machine for nefarious purpose and guarding against intrusion are, in the end, your responsibility alone. 4. Red hat equips you with tools to detect and deal with unauthorised access of many kinds. 5. You need to configure those tools and understand how to sense the warning they provide. 6. Fortunately Linux is development community is quick to find potential exploits and to create ways of slamming the doors before crackers can enter in your system. 7. Red hat is careful enough to making available new, patched version in which potential exploits have been found. 8. You should make sure to download and install the repaired package. 9. This line of defence...
Post a Comment
Read more

Explain the file systems supported by Linux.

By
21.Explain the file systems supported by Linux. Ans. 1. Linux can read/write to several file system that originated with other operating system much different from Linux. 2. One reason that Linux supports so many file systems is the design of its virtual file system (VFS) layer, its provides a fairly universal forms of file support, file systems supported by Linux are as follows: 3. ext3: • Ext3 stands for third extended file system. • Starting from Linux Kernel 2.4.15 ext3 was available. • The main benefit of ext3 is that it allows journaling. • Journaling has a dedicated area in the file system, where all the changes are tracked. • When the system crashes, the possibility of file system corruption is less because of journaling. (If no journaling, then fsck command (file system consistency check) is used to check for the corrupted file and to repair that file). • ext3 keeps a record of uncommitted file transactions and applies only those transactions when the sy...
Post a Comment
Read more

Explain the backing up and restoring files in Linux.

By
9.Explain the backing up and restoring files in Linux. Ans. 1. Backing-up and restoring files is done only by system administrator. 2. Because of built-in features, Linux doesn’t allow users to back-up their own files to removable disks. 3. It’s not enough to know that performing backup is your job, you need to formulate a strategy to making sure your system is not vulnerable to sudden disastrous disruptions. 4. If you have a high capacity tape drive and several good set of restore disks you can take backup every few days. 5. If you are managing a system with scores of users, you might find it more sensible to back up accounts and system configurations. 6. Only you can decide ‘what’ to backup, you need to decide ‘how frequently’ to perform backups, whether to maintain series of incremental backup. 7. You should maintain perfect backups without ever needing to restore to them, this means encouraging users to keep multiple copies of their important files in their ho...
Post a Comment
Read more