What are ICMP message types?
ICMP messages are mainly divided into two categories : Error reporting messages. Query messages.
What does ICMP type 8 mean?
ICMP request
For example, type 8 is used for an ICMP request and type 0 is used for an ICMP reply. We use type 3 for destination unreachable messages. The second byte called code specifies what kind of ICMP message it is. For example, the destination unreachable message has 16 different codes.
What does ICMP type 3 mean?
destination unreachable
ICMP error messages of Type: 3 represent a “destination unreachable” situation, where code values clarify the type of unreachability, as follows: 0 = net unreachable; 1 = host unreachable; 2 = protocol unreachable; 3 = port unreachable; 4 = fragmentation needed and DF is set; 5 = source route failed.
What is the ICMP type field used for?
ICMP is part of the Internet protocol suite as defined in RFC 792. ICMP messages are typically used for diagnostic or control purposes or generated in response to errors in IP operations (as specified in RFC 1122). ICMP errors are directed to the source IP address of the originating packet.
What does ICMP type 3 code 13 mean?
An ICMP type 3, code 13 response means that the machine is down.
What ICMP 13?
The Internet Control Message Protocol (ICMP) has many messages that are identified by a “type” field….ICMP Type Numbers.
| Type | Name | Reference |
|---|---|---|
| 13 | Timestamp | [RFC792] |
| 14 | Timestamp Reply | [RFC792] |
| 15 | Information Request (Deprecated) | [RFC792][RFC6918] |
What does ICMP Type 0 mean?
Echo Reply
ICMP Type Numbers. Code Fields. Type 0 — Echo Reply. Type 1 — Unassigned.
Does ping use ICMP?
ICMP is probably most well known as the message protocol used for the ping command. A ping command sends an ICMP echo request to the target host. The target host responds with an echo reply.
What does ICMP Type 11 code 0 denote?
Explanation: An ICMP Type 11, Code 0 means Time Exceeded [RFC792], Code 0 = Time to Live exceeded in Transit and Code 1 = Fragment Reassembly Time Exceeded.
What ICMP type is traceroute?
Traceroute is implemented with ICMP messages. It works by sending ICMP echo (ICMP type ‘8’) messages to the same destination with increasing value of the time-to-live (TTL) field. The routers along the traceroute path return ICMP Time Exceeded (ICMP type ’11’ ) when the TTL field become zero.
What protocols does ping use?
ICMP is probably most well known as the message protocol used for the ping command. A ping command sends an ICMP echo request to the target host.
How do I enable ICMP ping?
Windows Firewall
- Search for Windows Firewall , and click to open it.
- Click Advanced Settings on the left.
- From the left pane of the resulting window, click Inbound Rules.
- In the right pane, find the rules titled File and Printer Sharing (Echo Request – ICMPv4-In).
- Right-click each rule and choose Enable Rule.