"Ban dang cam thay viec truy cap cac trang web tro nen cham chap mot cach bat thuong? Mang chap chon du tin hieu Wi-Fi van manh me? Rat co the thu pham khong phai la nha cung cap dich vu Internet (ISP) cua ban, ma la do he thong may chu phan giai ten mien (DNS) mac dinh ma ban dang su dung. Dung lo lang, giai phap cuc ky don gian ma hieu qua la: Doi DNS sang 8.8.8.8 va 8.8.4.4, bo doi DNS cong cong huyen thoai cua Google.



Trong bai viet nay, 88nn chung ta se cung nhau kham pha ly do tai sao ban nen thuc hien thay doi nay va huong dan chi tiet tung buoc de ban co the tu minh thuc hien tren moi thiet bi, tu may tinh Windows, macOS cho den dien thoai di dong.



DNS La Gi va Tai Sao Viec Thay Doi Lai Quan Trong?



Truoc khi di sau vao huong dan, hay lam ro mot chut ve ""nguoi hung tham lang"" nay.



DNS (Domain Name System) hoat dong giong nhu cuon danh ba dien thoai khong lo cua Internet. Khi ban go `google.com` vao trinh duyet, DNS co nhiem vu dich chuoi ky tu de nho nay thanh dia chi IP (vi du: 172.217.160.142) ma may tinh co the hieu duoc de ket noi.



May chu DNS mac dinh ma ISP cua ban cung cap thuong hoat dong on dinh, nhung khong phai luc nao cung la nhanh nhat hay dang tin cay nhat. Khi may chu DNS mac dinh cham hoac qua tai, qua trinh phan giai ten mien se bi tri hoan, dan den cam giac trang web tai lau hon, giat lag, hoac tham chi la khong the truy cap.



Tai Sao Nen Chon DNS Cua Google (8.8.8.8 & 8.8.4.4)?



Google Public DNS la mot trong nhung lua chon DNS mien phi pho bien nhat tren toan cau vi nhung ly do sau:



1. Toc Do Vuot Troi: Cac may chu cua Google duoc dat tai nhieu trung tam du lieu khap the gioi, giup giam do tre (latency) va tang toc do phan giai ten mien dang ke so voi nhieu DNS dia phuong.

2. Do Tin Cay Cao: Voi co so ha tang khong lo, gan nhu khong bao gio xay ra tinh trang sap dich vu.

3. Bao Mat Tot Hon: Google cam ket khong ghi lai lich su duyet web cua ban (du ban van nen can trong voi bat ky dich vu nao cua cac ong lon cong nghe). Ho cung cung cap kha nang bao ve khoi cac cuoc tan cong phishing va malware.



Dia chi DNS ban can ghi nho:

Uu tien (Primary): `8.8.8.8`

Thay the (Secondary): `8.8.4.4`



Huong Dan Chi Tiet Cach Doi DNS Tren May Tinh Windows



Quy trinh nay ap dung cho Windows 10 va Windows 11.



Buoc 1: Truy Cap Cai Dat Mang



1. Nhan to hop phim `Windows + R`, go `ncpa.cpl` va nhan Enter. Hoac, ban co the vao Control Panel > Network and Sharing Center.

2. Tim ket noi mang ban dang su dung (thuong la Ethernet neu ban dung cap, hoac Wi-Fi neu ban dung mang khong day).

3. Chuot phai vao ket noi do va chon Properties (Thuoc tinh).



Buoc 2: Thay Doi Cai Dat IPv4



1. Trong cua so Properties, tim muc Internet Protocol Version 4 (TCP/IPv4).

2. Chon no va nhan nut Properties ben duoi.

3. O cuoi cua so moi hien ra, chon ""Use the following DNS server addresses"" (Su dung cac dia chi may chu DNS sau).



Buoc 3: Nhap Dia Chi Google DNS



1. Preferred DNS server: Nhap `8.8.8.8`

2. Alternate DNS server: Nhap `8.8.4.4`

3. Nhan OK de luu lai thay doi, sau do nhan Close.



Luu y: Sau khi thay doi, ban nen khoi dong lai trinh duyet hoac may tinh de dam bao cac thay doi co hieu luc ngay lap tuc.



Huong Dan Chi Tiet Cach Doi DNS Tren May Tinh macOS



Doi voi nguoi dung Mac, viec thay doi DNS cung kha truc quan.



Buoc 1: Mo Cai Dat Mang



1. Nhan vao bieu tuong Apple o goc tren ben trai man hinh.

2. Chon System Settings (tren macOS Ventura tro len) hoac System Preferences (tren cac phien ban cu hon).

3. Chon Network.



Buoc 2: Chinh Sua Cai Dat Ket Noi



1. Chon ket noi mang dang hoat dong cua ban (Wi-Fi hoac Ethernet) o thanh ben trai.

2. Nhan vao nut Details (Chi tiet) hoac Advanced (Nang cao).



Buoc 3: Nhap Dia Chi DNS



1. Trong cua so moi, chon tab DNS.

2. Nhan vao dau + o goc duoi ben trai danh sach DNS hien tai.

3. Nhap dia chi dau tien: `8.8.8.8`.

4. Nhan dau + lan nua va nhap dia chi thu hai: `8.8.4.4`.

5. Nhan OK hoac Apply de luu lai.



Doi DNS Tren Dien Thoai Thong Minh (iOS va Android)



Viec doi DNS tren dien thoai thuong duoc thuc hien cho tung mang Wi-Fi cu the, khong anh huong den du lieu di dong (3G/4G/5G).



Tren Android



1. Vao Settings (Cai dat) > Connections (Ket noi) hoac Wi-Fi.

2. Nhan va giu vao ten mang Wi-Fi ban dang ket noi, chon Modify network (Sua doi mang).

3. Tim tuy chon IP settings va chuyen tu DHCP sang Static (Tinh).

4. Keo xuong duoi, ban se thay cac truong de nhap DNS. Nhap:

DNS 1: `8.8.8.8`

DNS 2: `8.8.4.4`

5. Luu lai va ket noi lai mang Wi-Fi.



Tren iOS (iPhone/iPad)



1. Vao Settings (Cai dat) > Wi-Fi.

2. Nhan vao bieu tuong (i) ben canh ten mang Wi-Fi ban dang ket noi.

3. Cuon xuong phan Configure DNS (Cau hinh DNS) va chon Manual (Thu cong).

4. Nhan Add Server (Them May chu) va nhap `8.8.8.8`. Lap lai de them `8.8.4.4`.

5. Nhan Save (Luu).



Kiem Tra Xem Viec Doi DNS Da Thanh Cong Chua



Lam the nao de biet ban da duoc ""thang cap"" len DNS Google chua?



Tren Windows, mo Command Prompt (CMD) va go lenh:



```bash

ipconfig /displaydns

```



Lenh nay se hien thi bo nho cache DNS cua he thong. Tuy nhien, cach don gian nhat la su dung cac cong cu kiem tra DNS truc tuyen (vi du: DNSLeakTest). Neu cac dia chi IP tra ve tuong ung voi cac may chu cua Google, ban da thanh cong!



Khi Nao Ban Nen Can Nhac Cac Lua Chon DNS Khac?



Mac du Google DNS la tuyet voi, doi khi ban co the muon thu cac lua chon khac tuy theo nhu cau:



Cloudflare (1.1.1.1 & 1.0.0.1): Thuong duoc coi la nhanh hon Google DNS trong nhieu khu vuc do tap trung manh vao quyen rieng tu va toc do.

OpenDNS (208.67.222.222 & 208.67.220.220): Tot neu ban can bo loc noi dung va kiem soat truy cap nang cao.



Ket Luan



Doi DNS la mot trong nhung thao tac tinh chinh mang don gian nhat nhung mang lai hieu qua ro ret ve mat trai nghiem nguoi dung. Chi voi vai cu nhap chuot, ban da nang cap toc do truy cap, do on dinh va bao mat cho toan bo thiet bi cua minh. Dung chan chu, hay thu doi DNS sang `8.8.8.8` ngay hom nay de cam nhan su khac biet!"

Xem them:https://88nn.name/