These hooks will allow the user to override the default behavior of the client in creating a /etc/file.

wvdial not updating resolv conf-12

‘m using GNU/Linux with the Internet Systems Consortium DHCP Client. Many firewalls only allow access to certain nameservers only. Also, many corporates block snooping name server such as Open DNS due to privacy issues.

The dhclient, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol. The DHCP protocol allows a host to contact a central server which maintains a list of IP addresses which may be assigned on one or more subnets. Write protect your /etc/file using the chattr command on a Linux bases system.

It also updates my /etc/file each time my laptop connects to different network. This protocol reduces system administration workload, allowing devices to be added to the network with little or no manual configuration. The syntax is: option (attribute) write protects /etc/file on Linux so that no one can modify it including root user.

You can use chflags command on Free BSD based system.

If you need to manually define the nameservers (as with a static interface), add a line something like the following to the interfaces configuration file at /etc/network/interfaces file:/etc/or /etc/dhcp/file contains configuration information for dhclient.

You can turn on or off DNS update and other options for specific interface or all interface using this file. I am unable to ping any url (for example neither any of the website is working. I have setup a DNS server for my department which is running Free BSD 10.2.The DHCP client network configuration script is invoked from time to time by dhclient.This script is used by the dhcp client to set each interface’s initial configuration prior to requesting an address, to test the address once it has been offered, and to set the interface’s final configuration once a lease has been acquired.This script is not meant to be customized by the end user.If local customizations are needed, they should be possible using the enter and exit hooks provided.