private function validateIpsPairs($data, $field)
 {
     $ips_string = $this->getValue($data, $field);
     $ips = preg_replace('/\\s+/', ' ', $ips_string);
     $ips_split = explode(', ', $ips);
     foreach ($ips_split as $ip) {
         if ($ips = $this->isPair($ip)) {
             $validate_ip1 = new ValidatorIP();
             $validate_ip1->validate($ips[0]);
             $this->addError($field, $validate_ip1->getError());
             $validate_ip2 = new ValidatorIP();
             $validate_ip2->validate($ips[1]);
             $this->addError($field, $validate_ip2->getError());
         } else {
             $this->addError($field, new sfValidatorError($this, 'invalid', array('value' => $ip)));
         }
     }
 }