DHCP_Operation & Troubleshooting by VikasBagwe


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									ISC DHCP, Webmin GUI tool
              By Vikas Bagwe
  Introduction to ISC-DHCP Server & Webmin Interface

  The IP subnet creation & modification

  CPE Replacement
   CPE Reuse
  CPE Removal

  Troubleshooting DHCP

  Hand’s on training on CPE Replacement/Reuse/Removal

  Hand’s on training IP subnet creation & modification.
   ISC-DHCP Server, The most common open source
    DHCP server software for Unix system is the ISC
    server, it supports a wide range of options, and can
    be configured to behave differently for different
    clients, networks and address ranges.
   Supports assigning fixed addresses to hosts, or
    addresses from certain ranges. Every host is
    identified by its MAC addresses.
   Entries in the server configuration are arranged in a
    hierarchy that determines what client options and
    other settings apply to a particular client. Options in
    higher-level entries are overridden by those lower in
    the hierarchy, which allows an administrator to avoid
    repeating configuration information while still being
    able to set individual options for specific hosts.
   The ISC DHCP server's primary configuration file is
    called dhcpd.conf, and can usually be found in the
    /usr/local/etc directory.
   Other configuration files can be included by
    the primary file, the info of which can be found
    in dhcpd.conf file defined with include option.
   The only other file used by the server is
    dhcpd.leases, which contains all granted leases
    and is always kept up to date.
   Whenever the server is started, it re-reads this
    file to find out which leases are currently
   Webmin is a GUI interface for system administration
    for Unix. It is a open source software. Using any
    modern web browser, you can access its GUI
   Webmin supports DHCP server configuration &
    maintenance with its DHCP server module.
   Webmin's DHCP Server module directly updates the
    configuration and lease files when you manage
    subnets, hosts, groups and leases.
   Additionally it reports Dynamic IP pool utilization &
   The List DHCP Leases option when it used it scans
    the entire dhcpd.leases file hence the time taken to
    list leases is directly proportional to Lease file size.

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