Verify Router DHCP/BOOTP Relay Configuration in Java Encoder USS Code 39 in Java Verify Router DHCP/BOOTP Relay Configuration .net framework EAN13

Verify Router DHCP/BOOTP Relay Configuration generate, create none none in none ean 13 generating .net When the DH none none CP server is located on a LAN separate from the client, the router interface facing the client must be configured to relay DHCP requests. This is accomplished by configuring the IP helper address. If the IP helper address is not configured properly, client DHCP requests are not forwarded to the DHCP server.

Follow these steps to verify the router configuration:. VS.NET Step 1. Verify that none none the ip helper-address command is configured on the correct interface. It must be present on the inbound interface of the LAN containing the DHCP client workstations and must be directed to the correct DHCP server. The following output from the show running-config command verifies that the DHCP relay IP address is referencing the DHCP server address at 192.


R1# show ru nning-config <Output omitted> ! interface FastEthernet0/0 ip address 192.168.10.

1 255.255.255.

0 ip helper-address 192.168.11.

5 duplex auto speed auto ! <Output omitted>. Step 2. Verify that the global configuration command no service dhcp has not been configured. This command disables all DHCP server and relay functionality on the router. The command service dhcp does not appear in the configuration, because it is the default configuration.

. 7: IP Addressing Services Verify That the Router Is Receiving DHCP Requests Using debug Commands The DHCP pr none for none ocess fails if the router does not receive DHCP requests from the client. As a troubleshooting task, verify that the router is receiving the DHCP request from the client using the debug ip packet detail command. The debug command displays all types of IP traffic.

To help narrow the scope of the generated output, the debug command can be used with an access control list (ACL). The debug access control list is not as intrusive to the router. Example 7-15 shows the commands to verify that the DHCP server is receiving messages from the DHCP client.

. Example 7-15 Debugging DHCP R1# access- none for none list 100 permit ip host 0.0.0.

0 host 255.255.255.

255 R1# debug ip packet detail 100 IP packet debugging is on (detailed) for access list 100 R1# 00:16:46: IP: s=0.0.0.

0 (Ethernet0/0), d=255.255.255.

255, len 604, rcvd 2 00:16:46: UDP src=68, dst=67 00:16:46: IP: s=0.0.0.

0 (Ethernet0/0), d=255.255.255.

255, len 604, rcvd 2 00:16:46: UDP src=68, dst=67. The output shows that the router is receiving the DHCP requests from the client. The source none none IP address is 0.0.0.

0 because the client does not yet have an IP address. The destination is 255.255.

255.255 because the DHCP discovery message from the client is a broadcast. DHCP uses the UDP source, and destination ports are port 68 (BOOTP client) and port 67 (BOOTP server).

This output shows only a summary of the packet, not the packet itself. Therefore, it is not possible to determine if the packet is correct. Nevertheless, the router did receive a broadcast packet with the source and destination IP and UDP ports that are correct for DHCP.

. Verify That the Router Is Receiving and Forwarding DHCP Request Using debug ip dhcp server Command Another use none for none ful command for troubleshooting DHCP operation is the debug ip dhcp server command. This command reports server events, such as address assignments and database updates. It is also used to decode DHCP receptions and transmissions.

. Accessing the WAN, CCNA Exploration Companion Guide Packet Tracer Activity Configuring DHCP Using Easy IP DHCP assign none for none s IP addresses and other important network configuration information dynamically. Cisco routers can use the Cisco IOS feature set, Easy IP, as an optional, full-featured DHCP server. Easy IP leases configurations for 24 hours by default.

In this activity, you configure DHCP services on two routers and test your configuration. Use File e4-718.pka on the CD-ROM that accompanies this book to perform this activity using Packet Tracer.

. Scaling Networks with NAT All public none none Internet addresses must be registered with a Regional Internet Registry (RIR). Organizations can lease public addresses from an ISP. Only the registered holder of a public Internet address can assign that address to a network device.

There are currently five RIRs in the world:. American Re gistry for Internet Numbers (ARIN) R seaux IP Europ ens Network Coordination Centre (RIPE NCC) Asia Pacific Network Information Centre (APNIC) Latin America and Caribbean Internet Addresses Registry (LACNIC) AfriNIC.
Copyright © . All rights reserved.