Android Pie'ın özel DNS işlevi ne işe yarar

Zeynel Abidin Öztürk -
11 ay önce

Android 9 Pie'ın çok bahsedilmeyen yeniliklerinden bir tanesi, özel DNS işlevi. Bu yeni işlev, takip edilmeyi sevmeyenler için daha yüksek gizlilik sunuyor. Peki özel DNS nedir ve Android 9'lu cihazınızda nasıl etkinleştirilir?

Özel DNS, yeni birer teknoloji olan DNS over HTTPS ve DNS over TLS'yi kullanarak DNS sorgularının şifreli bağlantı üzerinden gönderilmesini sağlıyor. Yani tarayıcınızın adres çubuğuna yazdığınız adres, DNS sunucusuna ulaşana kadar kimse tarafından değiştirilemiyor. 

Özel DNS'i VPN ile karıştırmamakta fayda var. Özel DNS kullansanız dahi servis sağlayıcınız, hangi IP'lere bağlandığınızı rahatça görebilir. Dahası sunucu adı göstergesi (SNI) henüz bütün tarayıcılarda desteklenmediğinden, bağlandığınız sitenin adı da üçüncü partiler tarafından görüntülenebilir.

Özel DNS (DNS over HTTPS / TLS) Ne İşe Yarar?

Özel DNS, cihazınız ile DNS arasındaki trafiği şifreliyor ve DNS sorgularının yol üzerinde değiştirilmesinin önüne geçiyor. Bu süreçteki son adım halen güvensiz olduğundan, istekte bulunduğunuz alan adı, üçüncü partiler tarafından görüntülenebiliyor. Bu sorun, web tarayıcılarının sunacağı destekle aşılacak ancak sorguların kimse tarafından görünmesini istemiyorsanız, Dnscrypt veya VPN yolunu tercih edebilirsiniz.

Özel DNS, alan adını IP adresine dönüştürme dışında kalan internet trafiğini etkilemiyor, yani şifresiz http bağlantıları üzerinden yapılan aktarımlar, üçüncü partiler tarafından olduğu gibi görüntülenebilir ve değişitirilebilirler.

Android'de Özel DNS'i Açma

Android Pie, DNS over TLS işlevini destekliyor. Etkinleştirmek için aşağıdaki adımları izleyin:

1. Ayarlar > Ağ ve internet > Gelişmiş > Özel DNS'e gidin.

2. Özel DNS sunucu adı seçeneğini seçin.

3. 1dot1dot1dot1.cloudflare-dns.com yazın (Cloudflare'in sunduğu özel DNS hizmeti) ve Kaydet'e tıklayın.

4. https://1.1.1.1/help sayfasını ziyaret edin ve "Using DNS over TLS (DoT)" karşısında "Yes" yazdığından emin olun. Bu, DNS sorgularınızın şifrelendiği anlamına geliyor.

Sonuç

Özel DNS, üçüncü partilerin DNS isteklerini değiştirip sizi sahte sitelere yönlendirme olasılığını ortadan kaldırıyor. SNI desteği her tarayıcıda bulunmadığından henüz tam bir gizlilik sağlamıyor; böyle bir güvenlik arıyorsanız, bütün internet trafiğini şifreleyen VPN yolunu tercih edebilirsiniz. 

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