Shulou(Shulou.com)06/01 Report--

Name of the experiment: how DHCP works

Lab requirements:

1. Automatically assign available IP addresses to clients through service

two。 Connect different network segments with a router and assign available IP addresses to clients of other network segments

Configuration ideas:

First, the IP address must be manually configured for the DHCP server, and the IP address should be one of the IP addresses in the address pool that should be established for this network segment to ensure interoperability with the devices in this network segment (A network segment).

Write the IP address pool, subnet mask, gateway address, DNS of segment An and segment B in the DHCP server

Connect the A network segment and the B network segment with the router, configure the IP address for the port connecting the A network segment, that is, the gateway address of the A network segment, and configure the IP address for the other port, that is, the gateway address of the B network segment.

The client of network segment A can obtain a valid IP address by clicking to obtain the IP address automatically. Because the DHCP request message is sent by broadcast, the client of the B network segment cannot directly request to the IP address through the route, so the gateway port of the B network segment (that is, the port of the router connected to the B network segment) should turn on the DHCP relay, which can request the IP address from the DHCP server through unicast, so the DHCP service function must be enabled for this router.

The steps of the experiment:

Configure the IP address of the DHCP server 192.168.10.1 255.255.255.0

1. If the DHCP address pool is established, the address pool of network A segment should be 192.168.10.0 with a subnet mask of 255.255.255.0 gateway address 192.168.10.254 DNS9.9.9.9 and an address pool of B network segment 192.168.20.0 subnet mask 255.255.255.0 gateway address 192.168.20.254 DNS 8.8.8

two。 The port IP address of the router connected to segment An is 192.168.10.254, and the IP address of the routed port connecting segment B is 192.168.20.254.

3. The gateway port of network segment B, that is, the routing port connecting network segment B, should enable DHCP relay (command: IP address of ip helper-address+DHCP server), and enable DHCP service for routers connected to AB network segment.

Summary of the experiment:

DHCP relay is used only when the DHCP client and server are not on the same network segment.

DHCP relay command, which needs to be configured on the gateway port of the network segment where the DHCP client is located.

The device where the gateway port of the DHCP client is located, and the DHCP service must be enabled

DHCP server, you must configure the correct gateway IP address

The gateway IP in the DHCP address pool configured by the DHCP server must relay with DHCP

The IP address of the port where the command is located is the same, otherwise you cannot accurately locate the corresponding

DHCP address pool.

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