What port is ICMP echo request?
Ping uses ICMP(Internet Control Message Protocol). it does not use TCP or UDP. To be more precise ICMP type 8(echo request message) and type 0(echo reply message) are used. ICMP has no ports!
What does the ICMP echo request display?
When there are 2 hosts which have communication problems, a few simple ICMP Echo requests will show if the 2 hosts have their TCP/IP stacks configured correctly and if there are any problems with the routes packets are taking in order to get to the other side. …
How do I send an echo ICMP?
To send an ICMP echo request packet to the IP address that you specify: Issue the ping command in Privileged Exec mode….The following characters can appear in the display after issuing the ping command:
- !
- .
- ?
- A—Address mask request message.
- a—Address mask reply message.
- D—Router discovery advertisement message.
What ICMP type and code are used for the ICMP echo request?
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 port is Echo?
Service Name and Transport Protocol Port Number Registry
| Service Name | Port Number | Transport Protocol |
|---|---|---|
| echo | 7 | tcp |
| echo | 7 | udp |
| 8 | tcp | |
| 8 | udp |
What is ICMP echo reply?
The echo reply is an ICMP message generated in response to an echo request; it is mandatory for all hosts, and must include the exact payload received in the request. The identifier and sequence number can be used by the client to associate each echo request with its reply.
What does ICMP Type 0 mean?
unreachable
A good example is the “ping” utility which uses an ICMP request and ICMP reply message. When a certain host of port is unreachable, ICMP might send an error message to the source. When you see code 0 it means that the destination network was unreachable while code 1 means that the destination host was unreachable.
What does ICMP type mean?
The 4-byte ICMP header contains an 8-bit type field, which defines the ICMP type. The type determines what the ICMP packet is used for. Depending on the type, the 8-bit code field may also be used, which contains additional information. If the type does not have any codes defined, the code field is set to zero.
What is the ICMP port for Echo Request?
ICMP has type and code, but no ports. In legacy IP protocol, ICMP echo request (ping) is type 8 code 0, echo reply is type 0 code 0. For the current IP standard echo request is type 128 code 0 and echo reply is type 129 code 0…
What information should be returned from an echo request?
The Identifier, sequence number and data fields should be returned to the sender unaltered RFC 792, page 15: The data received in the echo request message must be returned in the echo reply message. The identifier and sequence number may be used by the echo sender to aid in matching the replies with the echo requests.
What is the IP source address in an echo reply?
The IP source address in an ICMP Echo Reply MUST be the same as the specific-destination address of the corresponding ICMP Echo Request message. Data received in an ICMP Echo Request MUST be entirely included in the resulting Echo Reply.
What is the difference between Echo Request and Echo Reply in Linux?
As you can see, echo request is message type 8/code 0 ; echo reply is 0/0 . As you know, when you do a ping command , its the echo request message and the return is an echo reply. So, there is nothing to do with TCP/UDP port numbers.
