{% set nameservers = ["10.1.1.151","10.1.1.152"] %}
{% set nameserver1 = nameservers|random %}
{% set nameserver2 = nameservers|random %}
{% for _ in range(1,100) %}
{% if not nameserver2 == nameserver1 %}
{% break %}
{% endif %}
{% set nameserver2 = nameservers|random %}
{% endfor %}
nameserver1: {{ nameserver1 }}
nameserver2: {{ nameserver2 }}