How to solve "Couldn't find an AF_INET address for " problem

edit

Or just set on every computer in you network (so you don't have to thing about addresses):

export ROS_IP=`hostname -I`

Or even, sometimes better, solution is to add this line in your .bashrc file.

The only solution that worked for me was to list the ip address of each computer along with its hostname to the /etc/hosts file.

If this is coming from a gazebo plugin -- it may be because gazebo is beignn run standalone rather than launched from ros as required.

Deluxe Version for Bash with multiple interfaces

function set_rosip
{
  RED="$(tput setb 4)"
  GREEN="$(tput setaf 0)$(tput setb 2)"
  BOLD=$(tput bold)
  NOCOLOR=$(tput sgr0)

  {
  ifconfig $1
  } &> /dev/null


  if [ $? -ne 0 ]; then
    echo -e "${RED}Interface ${BOLD}$1${NOCOLOR}${RED} not found! ${BOLD}ROS_IP not set!${NOCOLOR}"
    return 1
  fi

  ip_addr=`ifconfig $1 | grep 'inet addr:' | cut -d: -f2 | awk '{print $1}'`

  if [ -z "$ip_addr" ]; then
    if [ "$3" == "1" ]; then
      echo -e "${RED}Interface ${BOLD}$1${NOCOLOR}${RED} not connected, ${BOLD}ROS_IP not set!${NOCOLOR}"
    fi
    return 1
  fi

  if [ "$2" == "1" ]; then
    echo ${GREEN}ROS_IP set to $1 with IP $ip_addr${NOCOLOR}
  fi


  export ROS_IP=$ip_addr
}
#Tries to get setup ROS_IP in the specified order and stops on the first success ... 
set_rosip wlan0 1 0 || set_rosip eth0 1 1 \
# ||  set_rosip ${anotherinterface} ${printonsuccess} ${printonfail}

If you want only be notified if the last one fails:

set_rosip wlan0 0 0 || set_rosip eth0 0 1

I would say the best answer... worked 100% for my robot and local computers. have a look... http://www.umiacs.umd.edu/~cteo/umd-e...

I found a way, change your /etc/hosts Such as:

vim /etc/hosts

then add your ip:

192.168.3.5   my_hostname

MultipleMachines

I had same problem while ı am trying the upper link. I resolved, resolve is here.

open the .bashrc files and add this code.

You'll see those things like that:

export ROS_MASTER_URI=http://localhost (or something like that which is not your ip):11311
export ROS_HOSTNAME=(your machine name)

and you must change it like that:

export ROS_MASTER_URI=http://30.10.21.46:11311
export ROS_HOSTNAME=30.10.21.46

change your ip adress.