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Answer: To set the ip-address, subnet mask and default gateway of your new VMware ESXi installation, follow the steps mentioned below. This will let you set the ip-address, subnet mask and default gateway of the VMware ESXi as shown below.
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Cisco routers running Cisco IOS software include Dynamic Host Configuration Protocol (DHCP) server and relay agent software.
Your Cisco IOS software release may not support all of the features documented in this module. Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. The Cisco IOS DHCP relay agent will be enabled on an interface only when the ip helper-address is configured. DHCP clients need to use User Datagram Protocol (UDP) broadcasts to send their initial DHCPDISCOVER messages because they don't have information about the network to which they are attached. You can remedy this situation by configuring the interface of your router that is receiving the broadcasts to forward certain classes of broadcasts to a helper address. In Figure 1, the DHCP client broadcasts a request for an IP address and additional configuration parameters on its local LAN.
Automatic DHCP address allocation is typically based on an IP address, whether it be the gateway IP address (giaddr field of the DHCP packet) or the incoming interface IP address.
Cisco IOS supports this functionality by using the ip dhcp relay information option command. The DHCP server can use this information to assign IP addresses, perform access control, and set quality of service (QoS) and security policies (or other parameter-assignment policies) for each subscriber of a service provider network. 2.The DHCP relay agent intercepts the broadcast DHCP request packet and inserts the relay agent information option (option 82) in the packet.
4.The DHCP server receives the packet and uses the suboptions to assign IP addresses and other configuration parameters and forwards them back to the client.
5.The suboption fields are stripped off of the packet by the relay agent while forwarding to the client.
A DHCP relay agent may receive a message from another DHCP relay agent that already contains relay information. To ensure the correct operation of the reforwarding policy, make sure to disable the relay agent information check by using the no ip dhcp relay information check global configuration command.
See the "Configuring Relay Agent Information Option Support per Interface" section for more information on per-interface support for the relay agent information option. Enables the system to insert the DHCP relay agent information option (option-82 field) in forwarded BOOTREQUEST messages to a DHCP server.
Perform this task to enable support for the DHCP relay agent information option (option 82) on a per interface basis. The interface configuration allows the subscribers with different DHCP option 82 requirements on different interfaces to be reached from one Cisco router.
Read the "Relay Agent Information Option" and "Relay Agent Information Reforwarding Policy" sections to understand how DHCP processes the relay agent information option for global configurations.
8.Repeat Steps 3 through 7 to configure relay agent information option settings on different interfaces.
Configures a DHCP server to validate the relay information option in forwarded BOOTREPLY messages.
Configures the information reforwarding policy for a DHCP relay agent (what a relay agent should do if a message already contains relay information).
Repeat Steps 3 through 7 to configure relay agent information settings on different interfaces.
Perform this task to enable an Internet service provider (ISP) to add a unique identifier to the subscriber-identifier suboption of the relay agent information option. The unique identifier enables an ISP to identify a subscriber, to assign specific actions to that subscriber (for example, assignment of host IP address, subnet mask, and domain name system DNS), and to trigger accounting. Before the introduction of this feature, if a subscriber moved, each ISP had to be informed of the change and all ISPs had to reconfigure the DHCP settings for the affected customers at the same time. The new configurable subscriber-identifier option should be configured on the interface connected to the client. Specifies that a DHCP relay agent add a subscriber identifier suboption to the relay information option.
NoteThe ip dhcp relay information option subscriber-id command is disabled by default to ensure backward capability.
Relay pools provide a method to define DHCP pools that are not used for address allocation.


For example, after receiving the option in the DHCP DISCOVER message, the relay agent will match and identify the relay class from the relay pool and then direct the DHCP DISCOVER message to the DHCP server associated with that identified relay class.
In an example application, a Cisco router acting as a DHCP relay agent receives DHCP requests from two VoIP services (H323 and SIP). Both VoIP services have a different back-office infrastructure so they cannot be serviced by the same DHCP server.
The solution is to configure the relay agent with relay classes that are configured to match option 60 values sent by the client devices.
You must know the hexadecimal value of each byte location in the options to be able to configure the option hex command. Enables the relay agent to make forwarding decisions based on DHCP options inserted in the DHCP message. DHCP relay support for Multiprotocol Label Switching (MPLS) Virtual Private Networks (VPNs) enables a network administrator to conserve address space by allowing overlapping addresses.
In some environments, a relay agent resides in a network element that also has access to one or more MPLS VPNs. The VPN identifier suboption is used by the relay agent to tell the DHCP server the VPN for every DHCP request it passes on to the DHCP server, and it is also used to properly forward any DHCP reply that the DHCP server sends back to the relay agent. The subnet selection suboption allows the separation of the subnet where the client resides from the IP address used to communicate with the relay agent.
The server identifier override suboption value is copied in the reply packet from the DHCP server instead of the normal server ID address. After adding these suboptions to the DHCP relay agent information option, the gateway address is changed to the outgoing interface of the relay agent toward the DHCP server. Figure 3 shows a VPN scenario where the DHCP relay agent and DHCP server can recognize the VPN that each client resides within. Before configuring DHCP relay support for MPLS VPNs, you must configure standard MPLS VPNs.
Enables the system to insert VPN suboptions into the DHCP relay agent information option in forwarded BOOTREQUEST messages to a DHCP server and sets the gateway address to the outgoing interface toward the DHCP server. You only need to configure helper addresses on the interface where the UDP broadcasts that you want to forward to the DHCP server are being received, and you only need the ip dhcp smart-relay command configured if you have secondary addresses on that interface and you want the router to step through each IP network when forwarding DHCP requests.
If the ip dhcp smart-relay command is configured, the relay agent counts the number of times the client retries sending a request to the DHCP server when there is no DHCPOFFER message from the DHCP server. This functionality is useful when the DHCP server cannot be configured to use secondary pools. I will be posting instruction guides, how-to, troubleshooting tips and tricks on Linux, database, hardware, security and web. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for the Cisco IOS DHCP Relay Agent" section. Relay agents are used to forward requests and replies between clients and servers when they are not on the same physical subnet. For DHCP clients connected though the unnumbered interfaces, the DHCP relay agent automatically adds a static host route once the DHCP client obtains an address, specifying the unnumbered interface as the outbound interface. If the client is on a network segment that does not include a server, UDP broadcasts normally are not forwarded because most routers are configured to not forward broadcast traffic. The Cisco router implementation of the DHCP relay agent is provided via the ip helper-address interface configuration command. Router B, acting as a DHCP relay agent, picks up the broadcast and generates a new DHCP message to send out on another interface. In some networks, it is necessary to use additional information to further determine which IP addresses to allocate. The relay agent will automatically add the circuit identifier suboption and the remote ID suboption to the relay agent information option and forward them to the DHCP server. However, the global configuration is applied to interfaces without the interface configuration. However, if support for the relay agent information option is configured in global configuration mode, but not in interface configuration mode, the interface inherits the global configuration. Even if the service was not changed, every move involved administrative changes in the ISP environment. When a subscriber moves from one interface to the other, the interface configuration should also be changed.
These relay pools can specify that DHCP messages from clients on a specific subnet should be forwarded to a specific DHCP server. Requests for H323 devices must be forwarded to the H323 server and requests from the SIP devices must be forwarded to the SIP server.
Based on the option value, the relay agent will match and identify the relay class, and forward the DHCP DISCOVER message to the DHCP server associated with that identified relay class. The ip-address and subnet-mask arguments are the IP address and subnet mask for the relay source.


The relay agent can support multiple clients on different VPNs, and many of these clients from different VPNs can share the same IP address. A DHCP server that provides service to DHCP clients on those different VPNs must locate the VPN in which each client resides.
The VPN identifier suboption contains the VPN ID configured on the incoming interface to which the client is connected. In typical DHCP processing, the gateway address specifies both the subnet on which a DHCP client resides and the IP address that the server can use to communicate with the relay agent. The server identifier override suboption contains the incoming interface IP address, which is the IP address on the relay agent that is accessible from the client. When the packets are returned from the DHCP server, the relay agent removes the relay agent information options and forwards the packets to the DHCP client on the correct VPN. The only time you need to use this command is when the ip dhcp relay information option vpn global configuration command is configured and you want to override the global configuration. In this case, the interface inherits the global configuration, which may or may not be configured to insert VPN suboptions.
Without the smart relay agent configured, all requests are forwarded using the primary IP address on the interface. Consulta nuestras Condiciones de uso y nuestra Politica de privacidad para mas informacion. Consulta nuestra Politica de privacidad y nuestras Condiciones de uso para mas informacion. This module describes the concepts and tasks needed to configure the Cisco IOS DHCP relay agent. Relay agent forwarding is distinct from the normal forwarding of an IP router, where IP datagrams are switched between networks somewhat transparently. The route is automatically removed once the lease time expires or when the client releases the address.
As part of this DHCP message, the relay agent inserts the IP address of the interface containing the ip helper-address command into the gateway IP address (giaddr) field of the DHCP packet.
By using the relay agent information option (option 82), the Cisco IOS relay agent can include additional information about itself when forwarding client-originated DHCP packets to a DHCP server.
If a valid message is received, the relay agent removes the option-82 field and forwards the packet. With the introduction of this feature, if a subscriber moves from one Network Access Server to another, there is no need for a change in the configuration on the part of the DHCP server or ISP. These relay pools can be configured with relay classes inside the pool that help determine the forwarding behavior. The network element that contains the relay agent typically captures the VPN association of the DHCP client and includes this information in the relay agent information option of the DHCP packet. If you configure the VRF name but not the VPN ID, the VRF name is used as the VPN identifier suboption. Situations exist where the relay agent needs to specify the subnet on which a DHCP client resides that is different from the IP address the server can use to communicate with the relay agent. Using this information, the DHCP client sends all renew and release packets to the relay agent.
Because the clients have the same IP address, the DHCP relay agent and DHCP server use the VPN identifier, subnet selection, and server identifier override suboptions of the relay agent information option to distinguish the correct VPN of the client. If the DHCP server still does not respond after three more retries, then the next secondary address is used as the gateway address.
If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear. By contrast, relay agents receive DHCP messages and then generate a new DHCP message to send out on another interface. This IP address enables the DHCP server to determine which subnet should receive the offer and identify the appropriate IP address range to offer. The subnet selection suboption is included in the relay agent information option and passed on to the DHCP server. The relay agent adds all of the VPN suboptions and then forwards the renew and release packets to the original DHCP server. The relay agent sets the gateway address (giaddr field of the DHCP packet) and, if configured, adds the relay agent information option (option82) in the packet and forwards it to the DHCP server. The gateway address is changed to the outgoing interface of the relay agent toward the DHCP server.



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