Ip helper vs dhcp relay

DHCP relay is used to forward DHCP broadcast requests on LAN as a unicast packet to a central server, while ip helper-address is the command used to enable DHCP relay in routers.

1. What is DHCP IP helper?
2. What is the difference between DHCP and DHCP relay?
3. Should I enable DHCP relay?
4. When should I use IP helper?
5. Is IP Helper necessary?
6. What are the benefits of DHCP relay?
7. What are the 4 types of DHCP packets?
8. What port does DHCP relay use?
9. How many IP helpers can you have?
10. What is IP helper for PXE?
11. What port does DHCP IP helper use for TCP?
12. What happens if I disable IP Helper?
13. Is it safe to disable DHCP client?
14. Should I disable DHCP client service?
15. Do hackers use DHCP?
16. What is IP helper in SCCM?

What is DHCP IP helper?

Description. Defines the address of a remote DHCP server or DHCP relay agent. Up to eight addresses can be defined. The DHCP agent forwards DHCP client requests to all defined servers. This command requires that you define a source IP address for DHCP relay with the command ip source-interface.

What is the difference between DHCP and DHCP relay?

DHCP is a client server protocol that automatically provides IP hosts with IP addresses and other related configuration information. A DHCP relay (agent) is a host that forwards DHCP packets between clients and servers that are not on the same physical subnet.

Should I enable DHCP relay?

A DHCP relay simply forwards the DHCP requests to the DHCP server. It is needed when the DHCP server is not in the same subnet as the hosts needing a DHCP address.

When should I use IP helper?

An IP helper address is used to forward DHCP broadcasts to where they need to go. Through this process, you can use a single server for managing IP subnets on a network and checking client and device leases.

Is IP Helper necessary?

Usually, the only people who'd ever need to use IP Helper are software developers working with IPv6 connections, specialized networks, or accessing online databases with specific connection requirements.

What are the benefits of DHCP relay?

DHCP offers the following advantages: IP address management – A primary advantage of DHCP is easier management of IP addresses. In a network without DHCP, you must manually assign IP addresses. You must be careful to assign unique IP addresses to each client and to configure each client individually.

What are the 4 types of DHCP packets?

The complete DHCP exchange involves four types of packets: Discover, for your computer to locate the DHCP server; Offer, for the server to offer an IP address; Request, for your computer to ask for an of- fered address; and Ack, for the server to grant the address lease.

What port does DHCP relay use?

IPv4 DHCP relay traffic between relay and server is sent as UDP unicasts with source port of 67 and destination port of 67.

How many IP helpers can you have?

You can configure up to 4000 IP helper addresses on a routing switch. The helper addresses are shared between the DHCP relay agent and UDP forwarder feature. A maximum of sixteen IP helper addresses is supported in each VLAN.

What is IP helper for PXE?

One such simple router rule is the IP helper. The helper just tells the router to forward the DHCP requests to the known IP address of the DHP server. For PXE requests, you just need to configure the routers to forward the client request to the PXE server, just like you do with the DHCP server.

What port does DHCP IP helper use for TCP?

Answer. DHCP messages from a client to a server are sent to the 'DHCP server' port (67), and DHCP messages from a server to a client are sent to the 'DHCP client' port (68). If the S is used as a Relay agent: Client sends DHCP discover and Request messages with Source port 68 and Dest port 67.

What happens if I disable IP Helper?

Answer: The IP helper provides the system with tunnel connectivity benefits, and when it is disabled, the system cannot make tunnel connections. But if you are a basic user, then it won't affect the working of your system.

Is it safe to disable DHCP client?

There is no harm to disable DHCP client service on the machine since you are having static IP configured. Instead you can have few amount of physical resources free. Its not big but it will release system resources. It is ok to disable DHCP client since you have static IP addresses on your servers.

Should I disable DHCP client service?

Domain controllers do not require the DHCP Server service to operate and for higher security and server hardening, it is recommended not to install the DHCP Server role on domain controllers, but to install the DHCP Server role on member servers instead.

Do hackers use DHCP?

It's a denial of service attack, an attacker sends forged DHCP requests to the server and leases all the available IP's thus the legitimate clients will not get an IP assigned; or the Attacker may send bogus request/replies luring the client to connect to attacker's machine instead of valid DHCP server.

What is IP helper in SCCM?

IP helper-address <IP address of PXE server> IP forward-protocol UDP 4011. In an environment where there are multiple PXE servers, each PXE server will only reply to the clients that it cares about.