Mang Wi-Fi khach giup bao ve gadget trong nha ra sao?

Mang Wi-Fi khach giup bao ve gadget trong nha ra sao?

 *Anh minh hoa.*

[Diem chinh] Mang Wi-Fi khach la lop tach don gian nhung huu ich cho nha co nhieu thiet bi thong minh. Khi bat tinh nang nay tren router, nguoi dung tao them mot SSID rieng cho camera, chuong cua, o cam thong minh, loa thong minh, TV va cac gadget khong can truy cap vao may tinh ca nhan. Thiet bi van vao internet de nhan cap nhat hoac dung dich vu dam may, nhung bi han che nhin thay laptop, dien thoai, may in va o luu tru trong mang chinh. Voi gia dinh Viet Nam, day la cach giam rui ro bao mat ma khong can mua them phan cung dat tien.

Co bon y can nho. Thu nhat, gadget IoT thuong duoc cap nhat cham hon dien thoai va may tinh. Thu hai, thiet bi gia re co the dung mat khau mac dinh, firmware cu hoac dich vu dam may it minh bach. Thu ba, nhieu gia dinh dang dung chung mot Wi-Fi cho moi thu nen khi mot thiet bi yeu bi chiem quyen, phan con lai cua mang co the bi do quet. Thu tu, mang khach khong thay the mat khau manh, cap nhat firmware va xac thuc hai lop, nhung la lop phong thu de trien khai.

[Boi canh bao mat gadget trong gia dinh] Nha hien dai co nhieu thiet bi ket noi hon truoc. Mot can ho nho co the co router, dien thoai, laptop, TV thong minh, robot hut bui, camera, loa Bluetooth co Wi-Fi, dieu hoa ket noi ung dung, bong den thong minh va vai o cam dieu khien tu xa. Moi thiet bi them vao mang la mot diem can quan ly. Nguoi dung thuong quan tam tien ich truoc: bat den bang giong noi, xem camera tu xa, dieu khien may lanh ngoai duong. Phan bao mat bi bo lai vi giao dien cai dat roi, huong dan kho hieu hoac thiet bi hoat dong on nen khong ai muon dung vao.

Van de nam o cho mot mang gia dinh khong tu phan biet dau la thiet bi dang tin hon. Neu moi thu nam trong cung mang chinh, mot gadget yeu co the cung khong gian voi may tinh chua giay to thue, anh ca nhan, tai khoan ngan hang, tai lieu cong viec va trinh quan ly mat khau. Ke tan cong khong can pha moi lop bao ve cung luc. Ho thuong tim diem yeu nho nhat, roi dung no lam ban dap de quan sat hoac do cac thiet bi khac. Voi IoT, diem yeu do co the la firmware cu, dich vu quan tri mo, mat khau yeu hoac ung dung nha san xuat khong con duoc cham soc.

[Mang Wi-Fi khach hoat dong the nao?] Guest network la mang Wi-Fi phu do router tao ra. Nguoi dung dat ten mang va mat khau rieng, sau do cho thiet bi it tin cay hoac khach den nha dung mang do. Tren nhieu router, mang khach mac dinh co the vao internet nhung khong truy cap duoc thiet bi trong mang noi bo. Dieu nay goi la co lap client hoac tach mang khach. Neu router co tuy chon allow guests to access local network, nen tat tuy chon nay khi muc tieu la bao mat.

Cach hieu don gian: mang chinh la phong lam viec, con mang khach la phong cho co cua ra internet. Gadget trong phong cho van nhan duoc tin hieu, cap nhat va dieu khien tu ung dung dam may, nhung khong duoc tu do buoc vao phong lam viec. Neu mot o cam thong minh bi loi bao mat, thiet hai bi gioi han hon vi no kho nhin thay may tinh ca nhan hoac o NAS. Loi ich lon nhat khong phai la bao mat tuyet doi, ma la giam dien tich tan cong. Trong an ninh mang, giam dien tich tan cong thuong re hon va ben hon viec tin rang moi thiet bi deu an toan.

[Tac dong voi nguoi dung Viet Nam] Nguoi dung Viet Nam mua gadget tu nhieu nguon: san thuong mai dien tu, cua hang dien may, hang xach tay, qua tang, thiet bi khuyen mai cua nha mang hoac san pham it ten tuoi. Gia tot va tinh nang nhieu la diem hap dan, nhung vong doi cap nhat khong dong deu. Co thiet bi duoc va loi deu, co thiet bi gan nhu bi bo quen sau khi ban. Vi vay, tach mang la cach phu hop voi thuc te: nguoi dung khong can danh gia sau tung firmware, van co the giam rui ro bang cau hinh router.

Voi ho gia dinh, nhom nen dua vao mang khach gom camera trong nha, camera ngoai cua, chuong cua co hinh, TV thong minh, Android box, robot hut bui, may loc khong khi, bong den, o cam, cam bien, may in cu va thiet bi cua khach den choi. Nhom nen giu o mang chinh gom laptop lam viec, dien thoai ca nhan, may tinh ban, o luu tru mang va thiet bi can chia se file noi bo. Neu co thiet bi can noi chuyen voi nhau, vi du dien thoai can truyen hinh len TV, nguoi dung co the can nhac giu TV trong mang chinh hoac bat tinh nang chia se co kiem soat. Khong co cau hinh dung cho moi nha; muc tieu la tach thu khong can tin cay cao ra khoi du lieu quan trong.

[Goc nhin quan tri va ky thuat] Voi nguoi lam IT hoac quan tri van phong nho, nguyen tac nay con quan trong hon. Van phong thuong co camera, may cham cong, may in, TV phong hop, thiet bi trinh chieu va thiet bi ca nhan cua nhan vien. Neu tat ca dung chung mang voi may ke toan hoac may chua du lieu khach hang, rui ro tang khong can thiet. Router doanh nghiep, access point hoac firewall tot thuong ho tro VLAN, SSID rieng va rule chan truy cap noi bo. Neu co nang luc ky thuat, VLAN la ban nang cap manh hon mang khach thong thuong vi co the dat luat chi tiet: IoT chi duoc ra internet, may in chi nhan tu nhom van phong, camera chi noi chuyen voi dau ghi hoac may chu quan ly.

Du dung mang khach hay VLAN, van can kiem tra ba diem. Mot la thiet bi trong mang phu co that su bi chan truy cap mang chinh khong. Co the thu bang cach ket noi dien thoai vao mang khach roi mo dia chi IP cua router, may in hoac may tinh trong mang chinh. Hai la router co dang dung firmware moi khong. Router cu la diem yeu lon vi no dung o cua ngo mang. Ba la mat khau Wi-Fi co du manh va khac nhau giua mang chinh va mang khach khong. Tach mang nhung dung cung mat khau yeu se lam giam gia tri bao ve.

[Phan tich sau: loi ich, gioi han va rui ro] Loi ich cua mang Wi-Fi khach nam o ty le giua cong suc va hieu qua. Nguoi dung mat vai phut de bat, dat ten mang, dat mat khau va chuyen gadget sang mang moi. Doi lai, ho co mot rao chan mac dinh truoc nhieu tinh huong xau. Neu thiet bi IoT bi khai thac, ke tan cong gap them lop can khi muon quet may tinh ca nhan. Neu khach den nha can Wi-Fi, ho khong can biet mat khau mang chinh. Neu mat khau mang khach lo, nguoi dung co the doi rieng ma khong phai cau hinh lai toan bo laptop va dien thoai trong nha.

Nhung gioi han cung ro. Mang khach khong sua loi trong thiet bi. Neu camera gui du lieu len dich vu dam may kem bao mat, tach Wi-Fi khong giai quyet hoan toan. Neu nguoi dung dat mat khau admin router la admin, nguy co van cao. Neu bat tuy chon cho phep mang khach truy cap mang noi bo, loi ich bi mat. Neu router qua cu hoac firmware co lo hong, chinh router tro thanh diem yeu. Vi vay, mang khach nen duoc xem nhu mot lop trong mo hinh phong thu nhieu lop, khong phai la chan duy nhat.

Rui ro khac la tien ich bi giam. Mot so ung dung dieu khien thiet bi yeu cau dien thoai va gadget o cung mang cuc bo trong luc cai dat ban dau. Cach xu ly la tam ket noi dien thoai vao mang khach de cau hinh, sau do quay lai mang chinh. Mot so tinh nang nhu cast man hinh, AirPlay, chia se may in hoac dieu khien noi bo co the khong hoat dong khi thiet bi bi tach mang. Nguoi dung can chon: thiet bi nao can tien ich noi bo thi de mang chinh, thiet bi nao chi can internet thi dua sang mang khach.

[Cach trien khai an toan] Buoc dau tien la dang nhap trang quan tri router hoac ung dung cua nha mang. Tim muc Guest Network, Wi-Fi khach, mang khach hoac SSID phu. Bat mang nay cho bang tan 2.4 GHz truoc vi nhieu gadget IoT chi ho tro 2.4 GHz. Dat ten de nhan biet nhung khong lo thong tin rieng, vi du Home-IoT hoac Guest-Home. Dat mat khau dai, khong dung lai mat khau mang chinh, khong dung so dien thoai hoac ngay sinh.

Sau do kiem tra tuy chon cach ly. Tren mot so router, tuy chon co ten AP isolation, client isolation, access intranet, allow local network access hoac guest can access LAN. Muc tieu la chan khach truy cap LAN. Neu giao dien dung cau phu dinh, doc ky truoc khi bat. Tiep theo, chuyen tung gadget sang mang moi. Lam theo nhom nho de de sua loi: camera truoc, roi TV, roi o cam, roi thiet bi it dung. Sau moi nhom, kiem tra ung dung con dieu khien duoc khong. Neu thiet bi khong hoat dong vi can mang chinh, ghi chu lai va quyet dinh co chap nhan rui ro hay khong.

Cuoi cung, dat lich kiem tra dinh ky. Moi ba den sau thang, xem danh sach thiet bi dang ket noi router, doi mat khau mang khach neu tung chia se cho nhieu nguoi, cap nhat firmware router, xoa thiet bi la va tat tinh nang quan tri tu xa neu khong can. Voi gia dinh co tre em hoac nguoi lon tuoi, nen ghi lai mat khau mang khach o noi de tim nhung khong cong khai len mang xa hoi hoac anh chup man hinh.

[Can theo doi gi tiep?] Nguoi dung nen theo doi ba nhom tin hieu. Thu nhat la cap nhat tu nha san xuat router. Neu router khong con duoc cap nhat trong nhieu nam, nen can nhac doi thiet bi, nhat la khi nha co camera hoac lam viec tu xa. Thu hai la quyen truy cap cua gadget. Neu mot thiet bi yeu cau qua nhieu quyen trong ung dung, gui du lieu bat thuong hoac buoc mo truy cap noi bo, nen xem lai muc tin cay. Thu ba la hanh vi mang. Router moi thuong co danh sach thiet bi, canh bao thiet bi la hoac thong ke luu luong. Nhung dau hieu nhu thiet bi la, ten thiet bi khong ro, luu luong tang bat thuong vao ban dem deu dang kiem tra.

Trong tuong lai, nha thong minh se con pho bien hon. Khi so luong thiet bi tang, cach quan ly kieu moi thu dung chung mot Wi-Fi se ngay cang rui ro. Nguoi dung khong can tro thanh chuyen gia an ninh mang, nhung can vai thoi quen nen tang: tach mang, dung mat khau manh, cap nhat firmware, tat tinh nang khong dung, mua thiet bi tu nha san xuat co ho tro ro rang va khong dua du lieu nhay cam vao thiet bi re tien khong ro nguon goc.

[Ket luan] Mang Wi-Fi khach la viec nho nhung dang lam cho gia dinh nhieu gadget. No khong bien he thong thanh bat kha xam pham, nhung giup gioi han thiet hai khi mot thiet bi yeu gap su co. Voi camera, o cam thong minh, TV, robot hut bui va thiet bi cua khach, tach khoi mang chinh la lua chon hop ly. Voi laptop, dien thoai va du lieu quan trong, giu trong mang chinh voi mat khau manh va router cap nhat la nen tang an toan hon.

Cach tiep can tot nhat la thuc dung: bat mang khach, chuyen thiet bi it tin cay sang do, kiem tra tinh nang can thiet, roi duy tri bang lich kiem tra ngan. Bao mat gia dinh khong can bat dau bang giai phap dat tien. Nhieu khi, thay doi co gia tri nhat la dung dung tinh nang da co san trong router.

Nguon goc: https://www.komando.com/tips/cybersecurity/put-your-gadgets-on-a-guest-network/