Dynamic Host Configuration Protocol (DHCP) is a client/server protocol that automatically provides an internet Protocol (IP) host with its IP address and other related configuration information such as the subnet mask and default gateway. RFCs 2131 and 2132 define DHCP as an Internet Engineering Task Force (IETF) standard based on Bootstrap Protocol (BOOTP), a protocol with which DHCP shares many implementation details. DHCP allows hosts to obtain necessary TCP/IP configuration information from a DHCP server.
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The ISR router acts as both a DHCP client and server.
The role refers to the service or services that the server is providing, such as DHCP, DNS, HTTP, etc.
WIndows and non-Windows systems install DHCP in different ways, but the basic idea is the same group of steps:Add the DHCP service role to the systemActivate the serviceAdd the scope of IP addresses and exclusions to the DHCP serviceActivate the scopeOff you go - addresses!
Using routing and remote access server role
After installing the DHCP role, you configure a scope by giving it an IP address range, possible exclusions, and any scope options to be given out to clients. Then, you activate the scope, and you are done.
DHCP has to be configured by using the DHCP snap-in MMC console. This is under the Administrative Tools once DHCP has been installed. In Windows Server 2008 you add the Role, so it isn't installed via the Control Panel at all. For configuring the scope, you need to specify the address ranges to give out, any exclusions, and scope options for default gateway, etc.
The port 67 and port 68 are used by DHCP and the DHCP clients.
dhcp has to be authorized
The use of a DHCP relay agent is an agent that relays DHCP between DHCP clients and DHCP servers on different IP networks. The DHCP relay agent is compliant with RFC 1542.
router (config)# ip dhcp servicerouter (dhcp-config)# ip dhcp pool router (dhcp-config)# network
, the DHCP relay agent is now available under the Network Policy Server. When installing this role, select a role service "Routing and Remote Access" to be installed. The rest is the same like in Windows Server 2003 - just configure it using RRAS administrative console.
(DHCP) Dynamic host Configuration Protocol. The Default Port Number is: for DHCP client : 546 for DHCP server : 547