Client Automation - IP Address inventoried as 127.0.1.1 on Linux Ubuntu

Products

• CA Client Automation - Asset Management
• CA Client Automation - IT Client Manager
• CA Client Automation

Issue/Introduction

On Linux Ubuntu, under Inventory/Network IP Address appears as 127.0.1.1

 

Environment

Client Automation - All Versions

Cause

AM Agent uses function getaddrinfo to do hostname resolution.

This function uses the file /etc/nsswitch.conf to check hostname resolution order.

 

On Linux Ubuntu the file /etc/nsswitch.conf contains this line :

 

hosts:          files mdns4_minimal [NOTFOUND=return] dns

 

So File /etc/hosts is used before dns for name resolution.

 

 

On Linux Ubuntu the file /etc/hosts contains :

 

127.0.0.1 localhost
127.0.1.1 <ComputerName>

 

It is why 127.0.1.1 is returned by function getaddrinfo when it is called for name resolution of <ComputerName>

Resolution

A solution is to change the host name resolution order in file /etc/nsswitch.conf

 

Change the line

hosts:          files mdns4_minimal [NOTFOUND=return] dns

by

hosts:          mdns4_minimal [NOTFOUND=return] dns files

 

 

This could be done in command line with :

 

cp /etc/nsswitch.conf /etc/nsswitch.conf.bck_$$ && sed -i 's/\(hosts:..*\) files\(..*\)/\1\2 files/g' /etc/nsswitch.conf

caf register all

 

 

This command creates a backup of file /etc/nsswitch.conf before.