mtr online is an advanced version of the typical traceroute (or tracepath, tracert, tcptraceroute) command. mtr combines ping and a traditional traceroute and will ping each hop in the network path. It is a very effective way of discovering packet loss on particular hops in the path when troubleshooting connectivity problems.

Responses are determined from ICMP Time exceeded replies and ICMP echo replies from the destination node. It is possible to have mtr use UDP by specifying -u on the command line. When UDP mode is utilized, mtr watches for ICMP port unreachable packets (type 3, code 3) from the destination.

READY TO SEND PACKETS

Enter an IP address or host name to test

TRACEROUTE TOOL USED IN THIS TEST

If you are familiar with the regular traceroute used on Windows operating systems (or Linux), you will notice that the output of this tool is slightly different. That is because it is using the mtr tool that is a standard package for most common Linux distributions.

ABOUT MTR

For a brief introduction to mtr we will look at the first two paragraphs of the man page.

mtr combines the functionality of the traceroute and ping programs in a single net‐work diagnostic tool.

As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME by sending packets with purposely low TTLs. It continues to send packets with low TTL, noting the response time of the intervening routers. This allows mtr to print the response percentage and response times of the internet route to HOSTNAME. A sudden increase in packet loss or response time is often an indication of a bad (or simply overloaded) link.

INSTALL IN WINDOWS OR LINUX

mtr can be installed under Ubuntu linux by installing the MTR package. A simple apt-get install mtr will do it, or if you prefer use the package manager to install the program. For Windows users there is a win32 based version of mtr that uses the same methodology but completely different code due to the major architecture differences in the operating systems.

MTR COMMAND LINE

As it is an advanced tool, there are many options available for customising the type of traceroute performed.

:~$ mtr --help

Usage:
 mtr [options] hostname

 -F, --filename FILE        read hostname(s) from a file
 -4                         use IPv4 only
 -6                         use IPv6 only
 -u, --udp                  use UDP instead of ICMP echo
 -T, --tcp                  use TCP instead of ICMP echo
 -I, --interface NAME       use named network interface
 -a, --address ADDRESS      bind the outgoing socket to ADDRESS
 -f, --first-ttl NUMBER     set what TTL to start
 -m, --max-ttl NUMBER       maximum number of hops
 -U, --max-unknown NUMBER   maximum unknown host
 -P, --port PORT            target port number for TCP, SCTP, or UDP
 -L, --localport LOCALPORT  source port number for UDP
 -s, --psize PACKETSIZE     set the packet size used for probing
 -B, --bitpattern NUMBER    set bit pattern to use in payload
 -i, --interval SECONDS     ICMP echo request interval
 -G, --gracetime SECONDS    number of seconds to wait for responses
 -Q, --tos NUMBER           type of service field in IP header
 -e, --mpls                 display information from ICMP extensions
 -Z, --timeout SECONDS      seconds to keep probe sockets open
 -M, --mark MARK            mark each sent packet
 -r, --report               output using report mode
 -w, --report-wide          output wide report
 -c, --report-cycles COUNT  set the number of pings sent
 -j, --json                 output json
 -x, --xml                  output xml
 -C, --csv                  output comma separated values
 -l, --raw                  output raw format
 -p, --split                split output
 -t, --curses               use curses terminal interface
     --displaymode MODE     select initial display mode
 -n, --no-dns               do not resolve host names
 -b, --show-ips             show IP numbers and host names
 -o, --order FIELDS         select output fields
 -y, --ipinfo NUMBER        select IP information in output
 -z, --aslookup             display AS number
 -h, --help                 display this help and exit
 -v, --version              output version information and exit

See the 'man 8 mtr' for details.

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