The internet resources especially devices use Internet Protocol (IP) addresses which are unique for communication purposes. There are two major IP addressing schemes; Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv4). Most devices on the internet have been using the IPv4 for a long time. And since the internet grows exponentially according to the number of users, IPv4 addresses are nearly maxed out. It is this problem that led to the development of another upgraded version, the IPv6.
在容量方面，IPv4 的長度為32位，相當於大約43億個IP位址。另一方面，IPv6 的長度為128位，這大約是3.4×10^38個IP位址，超過1萬億。有了這個容量，用IPv6替換IPv4方案是合乎邏輯的。
為什麼要禁用它？
IPv6 與 IPv4 相比具有許多優勢，但由於其他因素，最好繼續使用 IPv4 尋址方案。以下是您應該禁用它的原因，尤其是在使用 VPN 時;
IP 洩漏
Most VPN service providers do not fully support the IPv6 addressing scheme, but they are compatible with IPv4. When tunneling occurs, data traffic using IPv4 will rarely leak as compared to IPv6. Due to incompatibility issues, data traffic using IPv6 will bypass the VPN tunnel and will be serviced directly by the ISP. This, in turn, will make you public to prying eyes including your ISP hence a leak.
除了洩漏之外，這裡還有其他原因，您應該禁用它;
硬體不相容
Most current internet-based hardware such as firewalls don’t fully support IPv6 while some servers support the addressing. This incompatibility has given rise to vulnerabilities which some malware has exploited. For instance, the most recent widespread malware that used command and control servers were IPv6 based. This gave them the advantage to bypass most firewalls that were only blocking IPv4 internet traffic.
配置問題
IPv6 is different from IPv4, and most people know how to configure IPv4 than IPv6. A transition from IPv4 to IPv6 can cause mistakes and confusions which can make it hard to troubleshoot network entities. Since also IPv6 hasn’t been adopted much, tunneling IPv6 over IPv4 has also led to security gaps not only in VPNs but also in other networks in general.
如何知道您是否在網路上使用 IPv6
This is a simple way to know as it involves typing this URL http://ip6.nl/ in your browser. The page will finish loading with both IPv4 and IPv6 results. If it says no IPv6 connectivity, you are safe.
如何在 Windows 6 中禁用 IPv10
第 1 步。右鍵按兩下任務列上的「網路」圖示，然後按兩下打開網路和共用中心。
第 2 步。在打開的設置視窗中，按下 更改適配器設置/選項
第 3 步。右鍵按兩下活動的網路適配器，它可以是 WIFI 或 乙太網 ，具體取決於您的連接，然後選擇 屬性。
第 4 步。打開屬性視窗后，滾動直到找到互聯網 協定版本 6 （TCP/IPv6）。取消選取 它旁邊的複選框，然後按下 確定 以保存更改。
第5步。現在 重新啟動計算機 ，享受使用VPN的樂趣，而不會發生IPv6洩漏。
