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CHECKLIST CAU HINH: DrayTek Vigor 2925 / 2925n / 2925Fn - hai duong internet
Can bang tai hoac du phong (failover). Lam tren giao dien web.
Nguon: https://thietbimangcu.com/cau-hinh-mau/
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0. VAO GIAO DIEN
   - Cam may tinh vao cong LAN, mo trinh duyet: http://192.168.1.1
   - Tai khoan mac dinh: admin / admin (doi ngay o System Maintenance >> Administrator Password)
   - May cu khong vao duoc: bat nguon, giu nut Factory Reset khoang 5 giay roi tha
     (den ACT chay nhanh la dang ve mac dinh).

1. KHAI BAO TUNG DUONG MANG: WAN >> Internet Access
   - WAN1 va WAN2: chon kieu truy cap
     + PPPoE: dien ten dang nhap / mat khau nha mang cap (modem de che do bridge)
     + Static or Dynamic IP: neu modem nha mang van lam router (double NAT)
   - Bam OK, kiem tra Online Status >> Physical Connection: WAN1, WAN2 deu "Connected"

2. CHON CHE DO: WAN >> General Setup
   - Can bang tai (dung ca hai duong cung luc):
     + WAN1 va WAN2: Enable = Yes, Active Mode = Always On
     + Load Balance Mode: Auto Weight (tu chia theo toc do) hoac According to Line Speed
       (dien toc do Downstream / Upstream that cua tung duong)
   - Du phong (chi dung WAN2 khi WAN1 mat):
     + WAN1: Active Mode = Always On
     + WAN2: Active Mode = Active on demand / Failover (ten muc tuy phien ban firmware),
       chon dieu kien kich hoat la khi WAN1 mat ket noi (WAN1 Fail)

3. CHIA DUONG THEO NHU CAU: Routing >> Load-Balance/Route Policy
   - Vi du: may ke toan / camera / VPN luon di WAN1:
     Source IP = dai IP cua nhom may, Interface = WAN1, Failover to = WAN2
   - Dich vu can IP co dinh (ngan hang, hoa don dien tu, VPN site-to-site) nen co dinh
     mot duong, tranh bi doi IP giua chung.

4. LAN VA DHCP: LAN >> General Setup
   - Doi IP LAN neu trung voi modem (vd 192.168.10.1), bat DHCP Server, dai cap phat .100-.200

5. KIEM TRA
   - Online Status: ca hai WAN co IP, Up Time tang deu
   - Rut day WAN1: may trong LAN van vao mang (che do du phong / can bang tai)
   - Diagnostics >> Data Flow Monitor: xem luu luong tung may, tung duong
   - Sao luu cau hinh: System Maintenance >> Configuration Backup