Working if change an part the code existent for it:
vi /etc/inc/captiveportal.inc
Code:
if (!function_exists('getNasIP')) {
/function getNasIP()
{/
global $config, $cpzone;
if (empty($config['captiveportal'][$cpzone]['radiussrcip_attribute'])) {
$nasIp = get_interface_ip();
} else {
if (is_ipaddr($config['captiveportal'][$cpzone]['radiussrcip_attribute']))
$nasIp = $config['captiveportal'][$cpzone]['radiussrcip_attribute'];
else
$nasIp = get_interface_ip($config['captiveportal'][$cpzone]['radiussrcip_attribute']);
}
if(!is_ipaddr($nasIp))
$nasIp = "0.0.0.0";
return $nasIp;
}