src/Ovh/Dedicated/Server/Server.php
public function addSecondaryDnsDomains($domain2add, $ip){
        self::getClient()->addSecondaryDnsDomains($this->getDomain(),$domain2add,$ip);
        return true;
    }
public function addSecondaryDnsDomains($domain2add, $ip){
        self::getClient()->addSecondaryDnsDomains($this->getDomain(),$domain2add,$ip);
        return true;
    }
Add domain to secondary DNS

@param string $domain2add
@param string ipv4 $ip
@return bool true
@throws Exception\ServerException
@throws \Ovh\Common\Exception\BadMethodCallException