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How to Install and Use Traceroute in CentOS 6/7, Oracle Linux 6/7, Linux RHEL 6/7, Ubuntu

mohitgangrademohitgangrade
Aug 30, 2022
4 minute read

Installing Traceroute on your VPS or Dedicated server is really easy. It takes no more than a minute. Traceroute is a network diagnostic tool that can help you find the causes of network connectivity problems.

In this article, I will show you the simple steps to install Traceroute in CentOS, Ubuntu, and other flavors of Linux. I will also show you how to run the command to diagnose network connectivity problems.

What is Traceroute

Traceroute is a command-line network diagnostic tool. It helps you identify network connectivity problems by showing you the route packets take to reach their destination or network host.

How To Install Traceroute in CentOS 6/7, Oracle Linux 6/7, Linux RHEL 6/7

To check if your computer or VPS server has the traceroute tool installed on it, simply open up the command line or connect to your server via SSH and run the following command:

# traceroute google.com

Traceroute’s not installed if you see the following error/warning in your terminal:

-bash: traceroute: command not found

Before you can install Traceroute, let’s make sure your system is up-to-date and has the latest list of available packages by running these two commands:

# yum clean all
# yum -y update

Now, you can install Traceroute by running this install command:

# yum install traceroute -y

Installing Traceroute usually takes only a couple of seconds. Once it’s done installing, you can verify it’s installation location by running this command:

# which traceroute

If Traceroute was installed successfully, you will see an output similar to this:

/bin/traceroute

How To Install Traceroute On Ubuntu

Installing Traceroute on Ubuntu is really simple.

First, run the update command:

# sudo apt-get update

Now, run the installation command:

# sudo apt-get install traceroute

That’s it. That’s all you need to do.

To verify if it’s been installed, run the which command:

# which traceroute

If the installation was successful, you will see something similar to this:

/usr/sbin/traceroute

How To Use The Traceroute Command In CentOS/Linux

The Traceroute command is very simple to use. Just run the command with the name of the destination (IP or website):

traceroute www.google.com

If it works, you should see something similar to this:

traceroute to www.google.com (142.250.191.142), 30 hops max, 60 byte packets
1  * * *
2  * * *
3  * * *
4  * * *
5  eqix-ch-200g-1.google.com (208.115.136.21)  2.878 ms *  2.844 ms
6  108.170.243.174 (108.170.243.174)  2.627 ms  2.626 ms eqix-ch-200g-1.google.com (208.115.136.21)  3.319 ms
7  142.251.60.5 (142.251.60.5)  1.704 ms 108.170.243.174 (108.170.243.174)  3.577 ms  3.202 ms
8  142.251.60.5 (142.251.60.5)  1.677 ms  1.711 ms ord38s29-in-f14.1e100.net (142.250.191.142)  1.896 ms

Find Network Path

Run the following command to find the network path from your server to destination (google.com) without resolving IP addresses to their domain names:

# traceroute www.google.com -n

Change Response Wait Time

If you want to change the amount of time Traceroute waits for response, you can pass the -w flag with the number of seconds you want to wait. The default is 5 seconds.

The following command will only wait 2 seconds for a response:

# traceroute www.google.com -w 2

Display All The Options

Passing the –help flag to the Traceroute command gives you a basic list of all the options you have at your disposal when running this command:

# traceroute --help

Here’s what the output should look like:

Usage:
  traceroute [ -46dFITnreAUDV ] [ -f first_ttl ] [ -g gate,... ] [ -i device ] [ -m max_ttl ] [ -N squeries ] [ -p port ] [ -t tos ] [ -l flow_label ] [ -w MAX,HERE,NEAR ] [ -q nqueries ] [ -s src_addr ] [ -z sendwait ] [ --fwmark=num ] host [ packetlen ]
Options:
  -4                          Use IPv4
  -6                          Use IPv6
  -d  --debug                 Enable socket level debugging
  -F  --dont-fragment         Do not fragment packets
  -f first_ttl  --first=first_ttl
                              Start from the first_ttl hop (instead from 1)
  -g gate,...  --gateway=gate,...
                              Route packets through the specified gateway
                              (maximum 8 for IPv4 and 127 for IPv6)
  -I  --icmp                  Use ICMP ECHO for tracerouting
  -T  --tcp                   Use TCP SYN for tracerouting (default port is 80)
  -i device  --interface=device
                              Specify a network interface to operate with
  -m max_ttl  --max-hops=max_ttl
                              Set the max number of hops (max TTL to be
                              reached). Default is 30
  -N squeries  --sim-queries=squeries
                              Set the number of probes to be tried
                              simultaneously (default is 16)
  -n                          Do not resolve IP addresses to their domain names
  -p port  --port=port        Set the destination port to use. It is either
                              initial udp port value for "default" method
                              (incremented by each probe, default is 33434), or
                              initial seq for "icmp" (incremented as well,
                              default from 1), or some constant destination
                              port for other methods (with default of 80 for
                              "tcp", 53 for "udp", etc.)
  -t tos  --tos=tos           Set the TOS (IPv4 type of service) or TC (IPv6
                              traffic class) value for outgoing packets
  -l flow_label  --flowlabel=flow_label
                              Use specified flow_label for IPv6 packets
  -w MAX,HERE,NEAR  --wait=MAX,HERE,NEAR
                              Wait for a probe no more than HERE (default 3)
                              times longer than a response from the same hop,
                              or no more than NEAR (default 10) times than some
                              next hop, or MAX (default 5.0) seconds (float
                              point values allowed too)
  -q nqueries  --queries=nqueries
                              Set the number of probes per each hop. Default is
                              3
  -r                          Bypass the normal routing and send directly to a
                              host on an attached network
  -s src_addr  --source=src_addr
                              Use source src_addr for outgoing packets
  -z sendwait  --sendwait=sendwait
                              Minimal time interval between probes (default 0).
                              If the value is more than 10, then it specifies a
                              number in milliseconds, else it is a number of
                              seconds (float point values allowed too)
  -e  --extensions            Show ICMP extensions (if present), including MPLS
  -A  --as-path-lookups       Perform AS path lookups in routing registries and
                              print results directly after the corresponding
                              addresses
  -M name  --module=name      Use specified module (either builtin or external)
                              for traceroute operations. Most methods have
                              their shortcuts (`-I' means `-M icmp' etc.)
  -O OPTS,...  --options=OPTS,...
                              Use module-specific option OPTS for the
                              traceroute module. Several OPTS allowed,
                              separated by comma. If OPTS is "help", print info
                              about available options
  --sport=num                 Use source port num for outgoing packets. Implies
                              `-N 1'
  --fwmark=num                Set firewall mark for outgoing packets
  -U  --udp                   Use UDP to particular port for tracerouting
                              (instead of increasing the port per each probe),
                              default port is 53
  -UL                         Use UDPLITE for tracerouting (default dest port
                              is 53)
  -D  --dccp                  Use DCCP Request for tracerouting (default port
                              is 33434)
  -P prot  --protocol=prot    Use raw packet of protocol prot for tracerouting
  --mtu                       Discover MTU along the path being traced. Implies
                              `-F -N 1'
  --back                      Guess the number of hops in the backward path and
                              print if it differs
  -V  --version               Print version info and exit
  --help                      Read this help and exit

Arguments:
+     host          The host to traceroute to
      packetlen     The full packet length (default is the length of an IP
                    header plus 40). Can be ignored or increased to a minimal
                    allowed value
mohitgangrade
mohitgangrade