Yes, you can. Connect your computer to the modem.
Or, you can configure your NIC card with a static address and not depend (temporarily) on DHCP. Just be careful, because choosing a static address can be duplicated elsewhere on a network.
Router is usually configured as a DHCP client for WAN (Internet) network and as a DHCP server for local network.
According to Microsoft:How to use automatic TCP/IP addressing without a DHCP server"A Windows-based computer that is configured to use DHCP can automatically assign itself an Internet Protocol (IP) address if a DHCP server is not available. For example, this could occur on a network without a DHCP server, or on a network if a DHCP server is temporarily down for maintenance."For more information, see Related Links, below.
One can get information about configuring a DHCP server online in the following websites: Wikipedia, Microsoft or FreeBSD. One should carefully read the information, since an incorrectly configured DHCP server can mean the loss of Internet connection.
In short, it's the computers hooked on the network. In order for a person with a laptop to get internet access, the DHCP must present(provide) it with IP address, DNS, and Gateway to the computer(client).
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 sub net mask and default gateway. For any further detail, so you can visit this website:http://www.iyogibusiness.com 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. If you want to more further detail so you can visit this website:http://www.iyogibusiness.com DHCP (Dynamic Host Configuration Protocol) is a network protocol that enables a server to automatically assign an IP address to a computer.
Below are the steps how DHCP Client/Server relationship works.IN the network the clicent device requests a packets to DHCP server to login to the network. This Packet known as DHCPDiscover.The DHCP Server receives that packet and in responce it sends a packet to the client, this is called as DHCPOffer. This DHCPOffer packet contains unleased or unused list of IP(Internet Protocol) addresses over the LAN.The DHCP Client receives the DHCPOffer from DHCP Server and responds. This is called DHCPRequest, and this request contains the accepted IP address in the DHCPOffer it received from DHCP Server.Now the DHCP Server receives the DHCPRequest and sends back the DHCPPackets and lets clients to access network.
Then any computer that is turned on - while the DHCP server is down - can't get an IP address, and therefore can't communicate on the network. Also, a DHCP lease may expire - the computer got the IP address for 24 hours, for example, and the time elapses. Same problem.
dhcp
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