ERROR: ssh: connect to host 10.0.3.11 port 22: No route to host

[athanato]

natou@ubuntu:~$ ssh-copy-id -i ~/.ssh/id_rsa.pub $DELTA_CP
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/natou/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: ERROR: ssh: connect to host 10.0.3.11 port 22: No route to host