Skillfully use routing when the DHCP server automatically assigns IP addresses

The company recently expanded its Office business and established subsidiaries in many areas. As the subsidiary has just been established, there is not enough funds to purchase the server, and the Office of the IP address is ready to use DHCP automatic allocation of the way to manage, without a dedicated DHCP server can not achieve automatic allocation of IP addresses. The author finds that because each subsidiary uses the corresponding router in the network exit, the DHCP service function can be enabled on the routing device of the company export, and the router acts as a DHCP server. Now, the author takes Cisco router as an example to introduce the configuration method. Assuming that the company's internal IP address is 10.30.70.1~10.30.70.255, the client in the network wants to obtain the IP address automatically via the DHCP service, although the company has two servers (IP addresses are 10.30.70.2 and 10.30.70.100), These two servers cannot choose to automatically obtain an IP address only with a fixed IP address. Service dhcp//start the DHCP service. IP dhcp exclude-add 10.30.70.2 10.30.70.100//retains two IP addresses, that is, these two IP addresses are not automatically allocated through DHCP. In this case, the server retains the two IP addresses, which are implemented by the above command. IP DHCP ping packets 3//assigned IP address before the address, that is, assigned to a computer IP address First Test connectivity, if the connectivity is not the problem of the IP address is completely allocated to the corresponding computer, the use of this method to effectively ensure the normal network connection. IP dhcp pool 1net 10.30.70.0 255.255.255.0//sets the scope of DHCP, including IP ranges and subnet masks. Default-router 10.30.70.1//Set the gateway address. Lease 8//Set the IP address lease for 8 days by DHCP. After the above configuration, the router can act as a DHCP server to assign IP addresses and gateways to clients and other network parameters, saving the cost of purchasing a DHCP server, and its automatic access to IP addresses is similar to the effect of using a DHCP server exclusively.