08-09-2009 08:40 AM - edited 03-06-2019 07:09 AM
Hi every body.
My book says when we use ping, we could receive five poossible responses identified by code in the output. For example:
! echo reply received
. nothing was received, ping timed out
U Icmp unreachable( destination )
N icmp unreahable( network)
M can not fragment the packet
? unknown packet received.
=================================
Let say we are not using ping, we are using wireshark.
we can capture Icmp messages exchanged between hosts when trouble occurs .
According to book, ICmp unreachable messages can includes fives seperate unreacable codes that further identify why the packet cannot be delivered.
These codes are:
Network unreachable:
host unreacable
Can't fragment
protocol unreachable
port unreachable
what are the alphabitical codes to represent these above messages?
thanks a lot.
08-09-2009 08:47 AM
I did some research and found something. I am posting here if someone might be interested, may find it useful.
The codes are not represented by alphabets as is the case in ping. Rather they are represented by digits.
Below is the link.
http://www.tcpipguide.com/free/t_ICMPv4DestinationUnreachableMessages-3.htm#Table_89
08-09-2009 11:37 AM
Sarah
Just for your reference in case you haven't seen this here is the full list of ICMP type and codes -
http://www.iana.org/assignments/icmp-parameters
Jon
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