What is ICMP error?
Table of Contents
- 1 What is ICMP error?
- 2 What are ICMP error-reporting messages?
- 3 How does ICMP provides error reporting in network layer?
- 4 Why is ICMP such an important tool for troubleshooting?
- 5 Who can send ICMP error reporting messages?
- 6 How is ICMP used for Distributed Denial of Service DDoS attacks?
- 7 What is the difference between ICMP query and error reporting?
- 8 What is Destination Unreachable message in ICMP?
What is ICMP error?
ICMP is a collection of predefined messages that an IP enabled device can use to inform another device about a specific condition. For example, whenever a router fails to forward or deliver an IP packet, it sends an ICMP message back to the source that explains why it can’t forward or deliver the packet.
What are ICMP error-reporting messages?
ICMP messages are divided into error-reporting messages and query messages. The error-reporting messages report problems that a router or a host (destination) may encounter. The query messages get specific information from a router or another host.
What is ICMP used for?
The Internet Control Message Protocol (ICMP) is a protocol that devices within a network use to communicate problems with data transmission. In this ICMP definition, one of the primary ways in which ICMP is used is to determine if data is getting to its destination and at the right time.
What types of the ICMP message are used?
Internet Control Message Protocol (ICMP) Parameters
- Type 0 — Echo Reply.
- Type 1 — Unassigned.
- Type 2 — Unassigned.
- Type 3 — Destination Unreachable.
- Type 4 — Source Quench (Deprecated)
- Type 5 — Redirect.
- Type 6 — Alternate Host Address (Deprecated)
- Type 7 — Unassigned.
How does ICMP provides error reporting in network layer?
If there is a mismatch packet will be dropped by the router. ICMP will take the source IP from the discarded packet and informs to the source by sending a parameter problem message.
Why is ICMP such an important tool for troubleshooting?
ICMP is used to troubleshoot and report error conditions: Without ICMP to help, IP would fail when faced with routing loops, ports, hosts, or networks that are down, etc. Commonly used ICMP types are echo request and echo reply (used for ping) and time to live exceeded in transit (used for traceroute).
Which ICMP type is used to identify echo requests?
Table 3.2 ICMP Message Types
| Type | Description ICMP Message Types |
|---|---|
| 8 | Echo Request (Ping Request, used with Type 0, Ping Reply) |
| 9 | Router Advertisement (Used with Type 9) |
| 10 | Router Solicitation (Used with Type 10) |
| 11 | Time Exceeded |
What protocol number is ICMP?
1
Assigned Internet Protocol Numbers
| Decimal | Keyword | Protocol |
|---|---|---|
| 1 | ICMP | Internet Control Message |
| 2 | IGMP | Internet Group Management |
| 3 | GGP | Gateway-to-Gateway |
| 4 | IPv4 | IPv4 encapsulation |
Who can send ICMP error reporting messages?
However, RFC 1122 states that devices can send ICMP error messages in response to ICMP query messages. For example, a router can issue an ICMP Redirect error message in response to an ICMP Echo Request query message that was sent to the wrong router. …
How is ICMP used for Distributed Denial of Service DDoS attacks?
A ping flood is a denial-of-service attack in which the attacker attempts to overwhelm a targeted device with ICMP echo-request packets, causing the target to become inaccessible to normal traffic. When the attack traffic comes from multiple devices, the attack becomes a DDoS or distributed denial-of-service attack.
How does ICMP handle error messages?
ICMP uses the source IP address to send the error message to the source (originator) of the datagram. Five types of errors are handled: destination unreachable, source quench, time exceeded, parameter problems, and redirection (see figure1).
What are the different types of ICMP messages?
Types of Messages: ICMP messages are divided into two broad categories: error-reporting messages and query messages. The error-reporting messages report problems that a router or a host (destination) may encounter when it processes an IP packet.
What is the difference between ICMP query and error reporting?
The error-reporting messages report problems that a router or a host (destination) may encounter when it processes an IP packet. The query messages, which occur in pairs, help a host or a network manager get specific information from a router or another host. One of the main responsibilities of ICMP is to report errors.
What is Destination Unreachable message in ICMP?
A Destination Unreachable message is generated if an IP datagram cannot be delivered. A Type field with the value 1 identifies this message. The ICMP message is sent to the source address of the invoking packet.