Add an option for ssh server to avoid remote host dns look up (usefull for IPv6)

group_vars/all

@@ -30,6 +30,7 @@ with_smtp_aliases: False
 with_ssh: True
 ssh_port: 2222
 ssh_ecdsa_key: True
+ssh_usedns: True
 
 http_auth_admin_password: seVDetGvSs7nA # openssl passwd -crypt adm123in
 

roles/common/templates/ssh/sshd_config.j2

@@ -30,6 +30,12 @@ HostKey /etc/ssh/ssh_host_ecdsa_key
 #Privilege Separation is turned on for security
 UsePrivilegeSeparation yes
 
+{% if not ssh_usedns %}
+# Enable/Disable reverse DNS check
+# Avois long lag in case of IPv6 connection with no reverse configured
+UseDns no
+{% endif %}
+
 # Lifetime and size of ephemeral version 1 server key
 KeyRegenerationInterval 3600
 ServerKeyBits 768