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DHCP

            Although a single DHCP server can support a network of any size, it is often useful to have two. Here's what happens when a DHCP client enters the network:.
             1. The client broadcasts a DHCP discover message that is forwarded to DHCP servers on the network.
             2. Each DHCP server that receives the discover message responds with a DHCP offer message that includes an IP address that is appropriate for the subnet where the client is attached.
             3. The client considers the offer message and selects one. It sends a request to use that address to the DHCP server that originated the offer.
             4. The DHCP server acknowledges the request and grants the client a lease to use the address.
             5. The client uses the IP address to bind to the network. If the IP address is associated with any configuration parameters, the parameters are incorporated into the client's TCP/IP configuration.
             In step 1 I told you that DHCP clients request their addresses using broadcast messages. The preceding chapters have pointed out several times that broadcast messages don't cross TCP/IP routers. Does that mean that a DHCP client can't obtain an IP address from a DHCP server on another subnet?.
             No, not if you configure routers with the BOOTP protocol. BOOTP is an older protocol that assigns IP addresses, and it remains in use to allow DHCP broadcasts to propagate across routers. Thanks to BOOTP, a DHCP server can service clients on any number of subnets.
             In Figure 14.17, BOOTP is enabled on the router, which must, of course, be configured to route TCP/IP traffic. When the client broadcasts a request for an IP address, BOOTP receives the request and sends a directed message to any DHCP server that it knows about. This allows a DHCP server on a remote subnet to receive the request. The DHCP server responds through a directed message, so there is no problem with routing the response back to the client.
            


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... is sent to a router or gateway. This can only be done if the router/gateway is able to forward datagrams to the destination host's network. DHCP DHCP stands for Dynamic Host Configuration Protocol, and is used to centrally manage TCP/ IP configurations of client nodes. If you've got more than a handful ... of computers to manage, then DHCP can help to save a great deal of time and trouble in setting up and administering a TCP/ IP network. DHCP offers the following features: * it allows you to define "pools" of TCP/ IP addresses, which ... are then allocated to client PCs by the server....

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... without informing you (the client). This setting ought not be permitted aside from temporary circumstances. Allocate Static IP Addresses to Devices Most home networkers incline toward utilizing element IP addresses. DHCP technology is in reality simple to set up. Unfortunately, this comfort likewise attempts further bolstering the good fortune of system assailants, who can without much of a stretch acquire legitimate IP ... addresses from your system's DHCP pool. Turn off DHCP on the router or access point, set an altered IP location extend rather, then design each one associated gadget...

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4. New and improved Networking tools in Windows XP

... your network connections. The way to utilize this shortcut would be to press the "repair" button. Pressing the button will release your IP and ask the DHCP server for a new address and lease. If no DHCP server can be found Windows XP automatically configures your IP address using "automatic private IP addressing" (APIPA) which gives you an IP address within the 169 ... ...

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... for the length of their online session. Static IP addresses provide network hackers with a permanent target. In an effort to remedy this issue, several popular DSL and cable providers offer DHCP address assignment, which provides a new IP every time the user logs on. However, this feature helps only slightly if this address stays the same throughout the days and weeks that ... ...

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