He thong mang cua minh gom Router ket noi voi Netscreen. Router ket noi ra Internet, Netscreen lam nhiem vu Firewall, minh setup firewall su dung Internet. Internet su dung binh thuong nhung khong biet tai sao co mot so website download duoc, co mot so website lai khong download duoc, minh khong tim duoc loi??? Cac ban co ai biet giup minh nhe'.
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