該問(wèn)題存在于任何CDN產(chǎn)品，如果您使用了CDN產(chǎn)品，該Discuz方法都適用。

該問(wèn)題導(dǎo)致的結(jié)果：

1.Discuz論壇可能無(wú)法獲得用戶的真實(shí)IP，導(dǎo)致某些用戶IP顯示的是加速樂(lè)節(jié)點(diǎn)的IP

2.論壇訪問(wèn)量過(guò)大的話，可能會(huì)導(dǎo)致用戶訪問(wèn)時(shí)提示“抱歉，您的 IP 地址不在被允許，或您的賬號(hào)被禁用，無(wú)法訪問(wèn)本站點(diǎn)”

產(chǎn)生原因：

使用CDN，對(duì)于網(wǎng)站訪客來(lái)說(shuō)，相當(dāng)于使用了代理訪問(wèn)，而Discuz在設(shè)計(jì)上，是優(yōu)先獲取代理IP，其它才會(huì)檢測(cè)代理服務(wù)器是否將用戶真實(shí)IP傳輸過(guò)來(lái)，也就是說(shuō)獲取代理IP優(yōu)先于用戶真實(shí)IP。如果您的網(wǎng)站不需要對(duì)用戶訪問(wèn)做過(guò)多的限制，強(qiáng)烈建議按照以下方

進(jìn)行：

解決方法(Discuz X2)：

打開(kāi)Discuz /source/class/class_core.php 文件

找到第341行，或者搜索“HTTP_CLIENT_IP”，找到如下代碼：

function _get_client_ip() {

$ip = $_SERVER['REMOTE_ADDR'];

if (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {

$ip = $_SERVER['HTTP_CLIENT_IP'];

} elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#/d{1,3}/./d{1,3}/./d{1,3}/./d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {

foreach ($matches[0] AS $xip) {

if (!preg_match('#^(10|172/.16|192/.168)/.#', $xip)) {

$ip = $xip;

break;

}

}

}

return $ip;

}

將以上代碼修改為：

function _get_client_ip() {

$ip = $_SERVER['REMOTE_ADDR'];

if (isset($_SERVER['HTTP_X_REAL_FORWARDED_FOR']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_X_REAL_FORWARDED_FOR'])) {

$ip = $_SERVER['HTTP_X_REAL_FORWARDED_FOR'];

}

elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_X_FORWARDED_FOR'])) {

$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];

}

elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {

$ip = $_SERVER['HTTP_CLIENT_IP'];

}

return $ip;

}

解決方法（Discuz x2.5）

打開(kāi)文件/source/class/discuz/discuz_application.php 找到如下代碼：

private function _get_client_ip() {

$ip = $_SERVER['REMOTE_ADDR'];

if (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {

$ip = $_SERVER['HTTP_CLIENT_IP'];

} elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#/d{1,3}/./d{1,3}/./d{1,3}/./d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {

foreach ($matches[0] AS $xip) {

if (!preg_match('#^(10|172/.16|192/.168)/.#', $xip)) {

$ip = $xip;

break;

}

}

}

return $ip;

}

將其修改為：

private function _get_client_ip() {

$ip = $_SERVER['REMOTE_ADDR'];

if (isset($_SERVER['HTTP_X_REAL_FORWARDED_FOR']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_X_REAL_FORWARDED_FOR'])) {

$ip = $_SERVER['HTTP_X_REAL_FORWARDED_FOR'];

}

elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_X_FORWARDED_FOR'])) {

$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];

}

elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}/.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {

$ip = $_SERVER['HTTP_CLIENT_IP'];

}

return $ip;

}

以上操作后，登陸CDN后臺(tái)和你的Discuz論壇后臺(tái)分別清除緩存即可。