ICMP Protocols with Wireshark

RUNNING HEAD: ICMP PROTOCOLS WITH WIRESHARK
ICMP Protocols with Wireshark
Name of the Student
Name of the University
Author Note

1ICMP PROTOCOLS WITH WIRESHARK
Ping request from source to destination
Command prompt: c:\windows\system32\ping –n 10 www.ece.ust.hk
Figure 1: Command Prompt for pinging destination host
(Source: Created by the Author)

2ICMP PROTOCOLS WITH WIRESHARK
Figure 2: Ping request packet with ICMP field information
(Source: Created by the Author)
IP addresses: Source IP, Destination IP
Respective IP addresses for the hosts are given below:
IP address of source host – 10.10.30.1
IP address of destination host – 10.10.30.186
Why ICMP packets don’t have port numbers
ICMP packets do not have port numbers of either the source or the destination hosts
since these are meant to communicate information pertaining to the network-layer through
routers and hosts, instead of using processes of the application layer. The “Type” and “Code”
sections of every ICMP packet in combination helps in identifying the particular message that
is to be received (Bao et al., 2016). It does not have to rely on port numbers in directing
ICMP messages to the processes of the application layer as all of these messages get
interpreted through the network software itself.
Examining a ping request by the Source host
Here the packet number 55 is examined as a ping request by the source host. This
packet is sent by the source host after 5.25 seconds of starting the communication process.
The “Type” number as well as “Code” number of this packet in the ICMP header are 8 and 0
respectively. The corresponding fields in the ICMP header of this packet are checksum, type,
code, and both identifiers - identifier (BE), identifier (LE) and sequence numbers - sequence
number (BE) and sequence number (LE) (Hui & Kelsey, 2016). All the fields - identifier
(BE), sequence number (BE), identifier (LE), sequence number (LE) and checksum are of
two bytes each.

3ICMP PROTOCOLS WITH WIRESHARK
Figure 3: Ping reply packet with ICMP field information
(Source: Created by the Author)
Examining corresponding reply packet
The corresponding reply ping for the above packet is 56 which is generated after 5.36
seconds of starting the communication process. The ICMP “Type” number and “Code”
number of this packet in the ICMP header are 0 and 0 respectively. The corresponding fields
in the ICMP header of this packet are checksum, type, code, and identifiers - identifier (BE),
identifier (LE) and sequence numbers - sequence number (BE) and sequence number (LE).
All the fields - identifier (BE), sequence number (BE), identifier (LE), sequence number (LE)
and checksum are of two bytes each.
Trace route
Command prompt: c:\windows\system32\tracert www.inria.fr