# File lib/smart_proxy_dns_route53/dns_route53_main.rb, line 31
    def create_ptr_record(fqdn, ip)
      if found = dns_find(ip)
        raise(Proxy::Dns::Collision, "#{ip} is already used by #{found}") unless found == fqdn
      else
        zone = get_zone(ip)
        new_record = Route53::DNSRecord.new(ip, 'PTR', ttl, [fqdn], zone)
        resp = new_record.create
        raise "AWS Response Error: #{resp}" if resp.error?
        true
      end
    end