rltraceroute6 command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

rltraceroute6: command not found

or when using sudo you get the following error message

sudo: rltraceroute6: command not found

Solutions to rltraceroute6: command not found

How To Fix rltraceroute6: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu rltraceroute6 is provided by ndisc6 package.

ndisc6 is:

ndisc6 gathers a few diagnostic tools for IPv6 networks including:

• ndisc6, which performs ICMPv6 Neighbor Discovery in userland,
• rdisc6, which performs ICMPv6 Router Discovery in userland,
• rltraceroute6, a UDP/ICMP IPv6 implementation of traceroute,
• tcptraceroute6, a TCP/IPv6-based traceroute implementation,
• tcpspray6, a TCP/IP Discard/Echo bandwidth meter,
• addrinfo, easy script interface for hostname and address resolution,
• dnssort, DNS sorting script.

To fix this problem, we can install more using the command below.

sudo apt-get -y install ndisc6

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install ndisc6.

sudo apt -y install ndisc6

Or if you have aptitude installed you can use the following command.

sudo aptitude install ndisc6

Summary

In this tutorial we learn how to fix rltraceroute6 command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.