Sep 26
Centralized DHCP Infrastructure

DHCP and Reservation

Cons – Increased traffic on the subnet they are on, increased server demand
Pros – Centralized administration, no need to scale up for increased requests of DHCP agents

(Most IP Routers have DHCP relay agent capabilities) DHCP Relay Agents DHCP server process incoming DHCPREQUEST

Regulate Traffic

Distribute servers on different subnets or adjust the IP lease time from the default 8 day lease to something less.

Fault Tolerance

Splitting Scopes on the servers using the 80/20 rule ensures that one server has 80 percent of the scope of IP's while the other has 20 percent with each scope deployed to both servers. If one server fails on the subnet, the other server on the other subnet can then fulfill the request, albeit a slight delay as it traverses subnets. At any time 80 percent of that scope is available for each subnet.

You can also design a failover cluster ensuring virtually no downtime however this may be overkill or just use standby servers.

IPv4

The IP 4 address is split into two or three sections (network, subnet, and host) XX:XX:XX:XX.

IPv6

The IP 6 address is split into six variable length sections (Format prefix, Registry ID, Provider ID, Subscriber ID, Subnet ID, and Interface ID.

Each X is a hex representation of a single byte XX:XX:XX:XX:XX:XX:XX:XX and the leading zeroes can be omitted from individual bytes values and repeated zero-byte values can be replaced with "::" only once on the address.

Disable the IPv6 stateless mode for networks that you want clients to obtain IPv6 addresses; otherwise the DHCP assumes that IPv6 addresses are being obtained by another source.

Install DHCP Server

  1. Add and install the DHCP Server Role using the Server Manager
    1. Next
  2. Choose the Local Area Connection card binding assigned
    1. IPv4 settings will be assigned if assigned on the NIC
  3. WINS is not required
  4. Click Add… for the Add or Edit DHCP Scopes

  5. Click Next
  6. Disable DHCPv6 stateless mode for this server
    1. http://technet.microsoft.com/en-us/library/cc787034(WS.10).aspx
  7. DHCP Server Authorization
    1. Set the credentials
  8. Export Settings
  9. Install

Install DHCP Relay Agents

  1. Add and install the DHCP Server Role using the Server Manager
    1. Add Roles
  2. Choose Network Policy and Access Services
    1. Select Routing and Remote Access Services
  3. Install
  4. Open Routing and Remote Access located at Star > Administrative Tools > Routing and Remote Access
  5. Right click the server node and choose Configure and Enable Routing and Remote Access
    1. Next
  6. Custom Configuration
  7. LAN Routing
    1. Finish
  8. Start Service
  9. Expand the IPv4 node
    1. Right click > General > New Routing Protocol
      1. Select DHCP Relay Agent > OK
    2. Right Click the DHCP Relay Agent node > New Interface > Local Area Connection > OK
    3. In the DHCP Relay Properties leave the defaults (4) and click OK
    4. Right click DHCP Relay Agent > Properties > Add the IP of the DHCP Server

Comments

There are no comments for this post.

 ‭(Hidden)‬ Blog Tools