{"id":478321,"date":"2023-08-09T09:30:51","date_gmt":"2023-08-09T09:30:51","guid":{"rendered":""},"modified":"2023-09-05T11:16:30","modified_gmt":"2023-09-05T11:16:30","slug":"packet-sniffer","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/packet-sniffer\/","title":{"rendered":"L\u00ednh b\u1eafn t\u1ec9a"},"content":{"rendered":"<p>Tr\u00ecnh nghe l\u00e9n g\u00f3i, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u00e1y ph\u00e2n t\u00edch m\u1ea1ng ho\u1eb7c m\u00e1y ph\u00e2n t\u00edch g\u00f3i, l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ea1ng m\u00e1y t\u00ednh \u0111\u1ec3 thu th\u1eadp v\u00e0 ph\u00e2n t\u00edch c\u00e1c g\u00f3i d\u1eef li\u1ec7u khi ch\u00fang \u0111i qua m\u1ea1ng. N\u00f3 cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng, chuy\u00ean gia an ninh m\u1ea1ng v\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n gi\u00e1m s\u00e1t v\u00e0 ki\u1ec3m tra l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng, x\u00e1c \u0111\u1ecbnh c\u00e1c s\u1ef1 c\u1ed1 ti\u1ec1m \u1ea9n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng. Tr\u00ecnh nghe l\u00e9n g\u00f3i \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n c\u1ee7a m\u1ea1ng.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a Packet Sniffer v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n<p>Kh\u00e1i ni\u1ec7m \u0111\u00e1nh h\u01a1i g\u00f3i b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a m\u1ea1ng m\u00e1y t\u00ednh khi c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u v\u00e0 k\u1ef9 s\u01b0 t\u00ecm c\u00e1ch hi\u1ec3u r\u00f5 h\u01a1n v\u00e0 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u. Vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn g\u00f3i sniffers l\u1ea7n \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng n\u0103m 1970, trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n ARPANET, ti\u1ec1n th\u00e2n c\u1ee7a Internet hi\u1ec7n \u0111\u1ea1i. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u1ea7n m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 gi\u00e1m s\u00e1t v\u00e0 ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng, t\u1eeb \u0111\u00f3 t\u1ea1o ra c\u00e1c c\u00f4ng c\u1ee5 nghe l\u00e9n g\u00f3i tin th\u00f4 s\u01a1.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Packet Sniffer: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1<\/h2>\n<p>Tr\u00ecnh nghe l\u00e9n g\u00f3i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 thu th\u1eadp, gi\u1ea3i m\u00e3 v\u00e0 ph\u00e2n t\u00edch c\u00e1c g\u00f3i d\u1eef li\u1ec7u \u0111i qua m\u1ea1ng. C\u00e1c g\u00f3i n\u00e0y ch\u1ee9a th\u00f4ng tin nh\u01b0 \u0111\u1ecba ch\u1ec9 IP ngu\u1ed3n v\u00e0 \u0111\u00edch, s\u1ed1 c\u1ed5ng, giao th\u1ee9c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0 d\u1eef li\u1ec7u t\u1ea3i tr\u1ecdng. Tr\u00ecnh nghe l\u00e9n g\u00f3i c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u1edf c\u00e1c l\u1edbp kh\u00e1c nhau c\u1ee7a m\u00f4 h\u00ecnh OSI, cho ph\u00e9p ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng m\u1ed9t c\u00e1ch linh ho\u1ea1t.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Packet Sniffer: C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a g\u00f3i sniffer bao g\u1ed3m m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu:<\/p>\n<ol>\n<li>\n<p><strong>Giao di\u1ec7n ch\u1ee5p g\u00f3i:<\/strong> Th\u00e0nh ph\u1ea7n n\u00e0y t\u01b0\u01a1ng t\u00e1c v\u1edbi card giao di\u1ec7n m\u1ea1ng (NIC) \u0111\u1ec3 thu th\u1eadp c\u00e1c g\u00f3i d\u1eef li\u1ec7u t\u1eeb m\u1ea1ng. C\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh hi\u1ec7n \u0111\u1ea1i cung c\u1ea5p c\u00e1c th\u01b0 vi\u1ec7n ch\u1ee5p g\u00f3i, ch\u1eb3ng h\u1ea1n nh\u01b0 libpcap tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng gi\u1ed1ng Unix v\u00e0 WinPcap tr\u00ean Windows, \u0111\u1ec3 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho qu\u00e1 tr\u00ecnh n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00f4ng c\u1ee5 gi\u1ea3i m\u00e3 g\u00f3i:<\/strong> Sau khi c\u00e1c g\u00f3i \u0111\u01b0\u1ee3c b\u1eaft, ch\u00fang c\u1ea7n \u0111\u01b0\u1ee3c gi\u1ea3i m\u00e3 \u0111\u1ec3 tr\u00edch xu\u1ea5t th\u00f4ng tin c\u00f3 \u00fd ngh\u0129a. C\u00f4ng c\u1ee5 gi\u1ea3i m\u00e3 di\u1ec5n gi\u1ea3i d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n trong c\u00e1c g\u00f3i v\u00e0 chuy\u1ec3n \u0111\u1ed5i n\u00f3 th\u00e0nh c\u00e1c \u0111\u1ecbnh d\u1ea1ng m\u00e0 con ng\u01b0\u1eddi c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c.<\/p>\n<\/li>\n<li>\n<p><strong>M\u00f4-\u0111un ph\u00e2n t\u00edch g\u00f3i:<\/strong> M\u00f4-\u0111un ph\u00e2n t\u00edch ki\u1ec3m tra n\u1ed9i dung c\u1ee7a c\u00e1c g\u00f3i v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng kh\u00e1c nhau d\u1ef1a tr\u00ean c\u00e1c quy t\u1eafc \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc ho\u1eb7c c\u00e1c b\u1ed9 l\u1ecdc do ng\u01b0\u1eddi d\u00f9ng x\u00e1c \u0111\u1ecbnh. N\u00f3 c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c giao th\u1ee9c, ph\u00e1t hi\u1ec7n s\u1ef1 b\u1ea5t th\u01b0\u1eddng v\u00e0 tr\u00edch xu\u1ea5t d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 t\u1eeb c\u00e1c g\u00f3i.<\/p>\n<\/li>\n<li>\n<p><strong>Giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng:<\/strong> Giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng tr\u00ecnh b\u00e0y d\u1eef li\u1ec7u \u0111\u00e3 thu th\u1eadp v\u00e0 ph\u00e2n t\u00edch cho ng\u01b0\u1eddi d\u00f9ng m\u1ed9t c\u00e1ch c\u00f3 t\u1ed5 ch\u1ee9c v\u00e0 th\u00e2n thi\u1ec7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng. Giao di\u1ec7n n\u00e0y c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1c t\u00ednh n\u0103ng nh\u01b0 l\u1ecdc, t\u00ecm ki\u1ebfm v\u00e0 tr\u00ecnh b\u00e0y tr\u1ef1c quan l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng.<\/p>\n<\/li>\n<\/ol>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Packet Sniffer<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a g\u00f3i sniffer bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Ph\u00e2n t\u00edch giao th\u1ee9c:<\/strong> Tr\u00ecnh th\u00e1m th\u00ednh g\u00f3i c\u00f3 th\u1ec3 di\u1ec5n gi\u1ea3i v\u00e0 ph\u00e2n t\u00edch c\u00e1c giao th\u1ee9c m\u1ea1ng kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 TCP, UDP, HTTP, DNS, v.v. T\u00ednh n\u0103ng n\u00e0y cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e1c lo\u1ea1i l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp tr\u00ean m\u1ea1ng c\u1ee7a h\u1ecd.<\/p>\n<\/li>\n<li>\n<p><strong>Gi\u00e1m s\u00e1t th\u1eddi gian th\u1ef1c:<\/strong> Tr\u00ecnh nghe l\u00e9n g\u00f3i c\u00f3 th\u1ec3 n\u1eafm b\u1eaft v\u00e0 ph\u00e2n t\u00edch c\u00e1c g\u00f3i d\u1eef li\u1ec7u trong th\u1eddi gian th\u1ef1c, cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean ph\u00e1t hi\u1ec7n v\u00e0 ph\u1ea3n h\u1ed3i k\u1ecbp th\u1eddi c\u00e1c s\u1ef1 c\u1ed1 m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00f9y ch\u1ecdn l\u1ecdc v\u00e0 ch\u1ee5p:<\/strong> Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 \u0111\u1eb7t b\u1ed9 l\u1ecdc \u0111\u1ec3 n\u1eafm b\u1eaft c\u00e1c lo\u1ea1i g\u00f3i c\u1ee5 th\u1ec3 d\u1ef1a tr\u00ean c\u00e1c ti\u00eau ch\u00ed nh\u01b0 IP ngu\u1ed3n, IP \u0111\u00edch, s\u1ed1 c\u1ed5ng v\u00e0 giao th\u1ee9c. Vi\u1ec7c ch\u1ee5p c\u00f3 ch\u1ecdn l\u1ecdc n\u00e0y gi\u00fap t\u1eadp trung v\u00e0o l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp m\u1ea1ng c\u00f3 li\u00ean quan.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t:<\/strong> B\u1eb1ng c\u00e1ch gi\u00e1m s\u00e1t l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng, qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c t\u1eafc ngh\u1ebdn v\u1ec1 hi\u1ec7u su\u1ea5t, c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 m\u1ea1ng t\u1ed5ng th\u1ec3.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n t\u00edch b\u1ea3o m\u1eadt:<\/strong> Tr\u00ecnh nghe l\u00e9n g\u00f3i h\u1ed7 tr\u1ee3 ph\u00e2n t\u00edch b\u1ea3o m\u1eadt b\u1eb1ng c\u00e1ch ph\u00e1t hi\u1ec7n c\u00e1c m\u1eabu l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u00e1ng ng\u1edd ho\u1eb7c \u0111\u1ed9c h\u1ea1i, gi\u00fap ng\u0103n ch\u1eb7n v\u00e0 gi\u1ea3m thi\u1ec3u c\u00e1c m\u1ed1i \u0111e d\u1ecda m\u1ea1ng ti\u1ec1m \u1ea9n.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i m\u00e1y d\u00f2 g\u00f3i tin<\/h2>\n<p>Packet sniffers c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n th\u00e0nh hai lo\u1ea1i ch\u00ednh: <strong>ng\u01b0\u1eddi \u0111\u00e1nh h\u01a1i ch\u1ebf \u0111\u1ed9 l\u0103ng nh\u0103ng<\/strong> V\u00e0 <strong>tr\u00ecnh th\u00e1m th\u00ednh ch\u1ebf \u0111\u1ed9 kh\u00f4ng l\u0103ng nh\u0103ng<\/strong>. H\u00e3y so s\u00e1nh hai lo\u1ea1i n\u00e0y b\u1eb1ng b\u1ea3ng:<\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>Ch\u1ebf \u0111\u1ed9 \u0111\u00e1nh h\u01a1i l\u0103ng nh\u0103ng<\/th>\n<th>Ng\u01b0\u1eddi \u0111\u00e1nh h\u01a1i \u1edf ch\u1ebf \u0111\u1ed9 kh\u00f4ng l\u0103ng nh\u0103ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ch\u1ebf \u0111\u1ed9 m\u1ea1ng<\/td>\n<td>Ch\u1ee5p t\u1ea5t c\u1ea3 c\u00e1c g\u00f3i tr\u00ean m\u1ea1ng<\/td>\n<td>Ch\u1ee5p c\u00e1c g\u00f3i \u0111\u01b0\u1ee3c g\u1eedi c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>(bao g\u1ed3m c\u1ea3 nh\u1eefng th\u1ee9 kh\u00f4ng d\u00e0nh cho<\/td>\n<td>\u0111\u1ebfn m\u00e1y ch\u1ee7 \u0111ang ch\u1ea1y<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>giao di\u1ec7n c\u1ee7a sniffer)<\/td>\n<td>ng\u01b0\u1eddi \u0111\u00e1nh h\u01a1i<\/td>\n<\/tr>\n<tr>\n<td>\u00dd ngh\u0129a b\u1ea3o m\u1eadt<\/td>\n<td>C\u00f3 th\u1ec3 g\u00e2y lo ng\u1ea1i v\u1ec1 an ninh v\u00ec n\u00f3<\/td>\n<td>\u00cdt c\u00f3 kh\u1ea3 n\u0103ng t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>c\u00f3 th\u1ec3 n\u1eafm b\u1eaft th\u00f4ng tin nh\u1ea1y c\u1ea3m<\/td>\n<td>lo ng\u1ea1i v\u00ec n\u00f3 thu \u0111\u01b0\u1ee3c \u00edt h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>t\u1eeb c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c<\/td>\n<td>giao th\u00f4ng<\/td>\n<\/tr>\n<tr>\n<td>Kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u \u0111\u00e3 thu th\u1eadp<\/td>\n<td>N\u1eafm b\u1eaft m\u1ea1ng l\u01b0\u1edbi r\u1ed9ng l\u1edbn h\u01a1n<\/td>\n<td>Thu th\u1eadp d\u1eef li\u1ec7u h\u1ea1n ch\u1ebf,<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>D\u1eef li\u1ec7u l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp<\/td>\n<td>gi\u1ea3m kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u \u0111\u1ec3 ph\u00e2n t\u00edch<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong<\/td>\n<td>X\u1eed l\u00fd s\u1ef1 c\u1ed1 m\u1ea1ng v\u00e0<\/td>\n<td>B\u1ea3o m\u1eadt v\u00e0 g\u1ee1 l\u1ed7i m\u1ea1ng<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>ph\u00e2n t\u00edch c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 m\u1ea1ng<\/td>\n<td>v\u1ea5n \u0111\u1ec1 c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng Packet Sniffer, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n<p>B\u1ed9 nghe l\u00e9n g\u00f3i c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng:<\/strong> Qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng tr\u00ecnh nghe l\u00e9n g\u00f3i \u0111\u1ec3 ch\u1ea9n \u0111o\u00e1n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng, ch\u1eb3ng h\u1ea1n nh\u01b0 s\u1ef1 c\u1ed1 k\u1ebft n\u1ed1i, \u0111\u1ed9 tr\u1ec5 cao v\u00e0 m\u1ea5t g\u00f3i.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n t\u00edch b\u1ea3o m\u1eadt:<\/strong> Tr\u00ecnh nghe l\u00e9n g\u00f3i \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong b\u1ea3o m\u1eadt m\u1ea1ng b\u1eb1ng c\u00e1ch ph\u00e1t hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng tr\u00e1i ph\u00e9p ho\u1eb7c \u0111\u00e1ng ng\u1edd, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c n\u1ed7 l\u1ef1c x\u00e2m nh\u1eadp m\u1ea1ng ho\u1eb7c li\u00ean l\u1ea1c b\u1eb1ng ph\u1ea7n m\u1ec1m \u0111\u1ed9c h\u1ea1i.<\/p>\n<\/li>\n<li>\n<p><strong>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t:<\/strong> B\u1eb1ng c\u00e1ch gi\u00e1m s\u00e1t c\u00e1c m\u1eabu l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng, qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t m\u1ea1ng v\u00e0 s\u1eed d\u1ee5ng b\u0103ng th\u00f4ng.<\/p>\n<\/li>\n<\/ol>\n<p>B\u1ea5t ch\u1ea5p t\u00ednh h\u1eefu d\u1ee5ng c\u1ee7a ch\u00fang, tr\u00ecnh nghe l\u00e9n g\u00f3i c\u00f3 th\u1ec3 \u0111\u1eb7t ra m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c:<\/p>\n<ul>\n<li>\n<p><strong>M\u1ed1i quan t\u00e2m v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0:<\/strong> Trong nh\u1eefng m\u00f4i tr\u01b0\u1eddng \u01b0u ti\u00ean quy\u1ec1n ri\u00eang t\u01b0, vi\u1ec7c thu th\u1eadp v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u m\u1ea1ng c\u00f3 th\u1ec3 g\u00e2y lo ng\u1ea1i v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0. \u0110i\u1ec1u c\u1ea7n thi\u1ebft l\u00e0 ph\u1ea3i th\u1ef1c hi\u1ec7n ki\u1ec3m so\u00e1t truy c\u1eadp v\u00e0 m\u00e3 h\u00f3a th\u00edch h\u1ee3p.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u00e1 t\u1ea3i d\u1eef li\u1ec7u:<\/strong> Vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u m\u1ea1ng qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng qu\u00e1 t\u1ea3i d\u1eef li\u1ec7u, g\u00e2y kh\u00f3 kh\u0103n cho vi\u1ec7c ph\u00e2n t\u00edch v\u00e0 x\u1eed l\u00fd th\u00f4ng tin m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<li>\n<p><strong>Nh\u1eefng c\u00e2n nh\u1eafc v\u1ec1 m\u1eb7t ph\u00e1p l\u00fd v\u00e0 \u0111\u1ea1o \u0111\u1ee9c:<\/strong> Vi\u1ec7c s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 nghe l\u00e9n g\u00f3i ph\u1ea3i tu\u00e2n th\u1ee7 c\u00e1c quy \u0111\u1ecbnh ph\u00e1p lu\u1eadt v\u00e0 nguy\u00ean t\u1eafc \u0111\u1ea1o \u0111\u1ee9c \u0111\u1ec3 tr\u00e1nh b\u1ecb gi\u00e1m s\u00e1t tr\u00e1i ph\u00e9p v\u00e0 vi ph\u1ea1m d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<\/ul>\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y, qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng n\u00ean:<\/p>\n<ul>\n<li>\n<p><strong>S\u1eed d\u1ee5ng m\u00e3 h\u00f3a:<\/strong> M\u00e3 h\u00f3a d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u kh\u1ecfi b\u1ecb truy c\u1eadp tr\u00e1i ph\u00e9p trong qu\u00e1 tr\u00ecnh ch\u1ee5p g\u00f3i.<\/p>\n<\/li>\n<li>\n<p><strong>\u00c1p d\u1ee5ng c\u00e1c b\u1ed9 l\u1ecdc:<\/strong> Thi\u1ebft l\u1eadp b\u1ed9 l\u1ecdc \u0111\u1ec3 ch\u1ec9 thu th\u1eadp d\u1eef li\u1ec7u li\u00ean quan, gi\u1ea3m kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u v\u00e0 t\u1eadp trung v\u00e0o c\u00e1c s\u1ef1 c\u1ed1 m\u1ea1ng c\u1ee5 th\u1ec3.<\/p>\n<\/li>\n<li>\n<p><strong>Tu\u00e2n th\u1ee7:<\/strong> \u0110\u1ea3m b\u1ea3o r\u1eb1ng vi\u1ec7c s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 nghe l\u00e9n g\u00f3i ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u ph\u00e1p l\u00fd v\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>H\u00e3y so s\u00e1nh g\u00f3i sniffers v\u1edbi hai thu\u1eadt ng\u1eef li\u00ean quan: <strong>H\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n x\u00e2m nh\u1eadp m\u1ea1ng (NIDS)<\/strong> V\u00e0 <strong>H\u1ec7 th\u1ed1ng ng\u0103n ch\u1eb7n x\u00e2m nh\u1eadp m\u1ea1ng (NIPS)<\/strong>:<\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>L\u00ednh b\u1eafn t\u1ec9a<\/th>\n<th>NIDS<\/th>\n<th>NIPS<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ch\u1ee9c n\u0103ng ch\u00ednh<\/td>\n<td>Ch\u1ee5p v\u00e0 ph\u00e2n t\u00edch g\u00f3i tin<\/td>\n<td>Ph\u00e1t hi\u1ec7n s\u1ef1 x\u00e2m nh\u1eadp ti\u1ec1m \u1ea9n<\/td>\n<td>Ph\u00e1t hi\u1ec7n v\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 x\u00e2m nh\u1eadp<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ea1m vi gi\u00e1m s\u00e1t<\/td>\n<td>Gi\u00e1m s\u00e1t th\u1ee5 \u0111\u1ed9ng<\/td>\n<td>Gi\u00e1m s\u00e1t th\u1ee5 \u0111\u1ed9ng<\/td>\n<td>Gi\u00e1m s\u00e1t t\u00edch c\u1ef1c<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ea3n \u1ee9ng v\u1edbi s\u1ef1 x\u00e2m nh\u1eadp<\/td>\n<td>Kh\u00f4ng c\u00f3 ph\u1ea3n h\u1ed3i t\u1ef1 \u0111\u1ed9ng<\/td>\n<td>T\u1ea1o c\u1ea3nh b\u00e1o<\/td>\n<td>Ph\u00f2ng ng\u1eeba t\u1ef1 \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 ph\u1ee9c t\u1ea1p tri\u1ec3n khai<\/td>\n<td>T\u01b0\u01a1ng \u0111\u1ed1i d\u1ec5 tri\u1ec3n khai<\/td>\n<td>Ph\u1ee9c t\u1ea1p v\u1eeba ph\u1ea3i<\/td>\n<td>Ph\u1ee9c t\u1ea1p h\u01a1n<\/td>\n<\/tr>\n<tr>\n<td>M\u1ee5c \u0111\u00edch<\/td>\n<td>Ph\u00e2n t\u00edch m\u1ea1ng t\u1ed5ng qu\u00e1t<\/td>\n<td>Ph\u00e1t hi\u1ec7n v\u00e0 gi\u00e1m s\u00e1t<\/td>\n<td>Ph\u00f2ng ng\u1eeba th\u1eddi gian th\u1ef1c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Packet Sniffer<\/h2>\n<p>T\u01b0\u01a1ng lai c\u1ee7a g\u00f3i sniffers n\u1eb1m \u1edf nh\u1eefng ti\u1ebfn b\u1ed9 trong c\u00e1c l\u0129nh v\u1ef1c sau:<\/p>\n<ol>\n<li>\n<p><strong>T\u00edch h\u1ee3p h\u1ecdc m\u00e1y:<\/strong> Vi\u1ec7c t\u00edch h\u1ee3p c\u00e1c thu\u1eadt to\u00e1n h\u1ecdc m\u00e1y v\u00e0o tr\u00ecnh th\u00e1m th\u00ednh g\u00f3i c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng ph\u00e1t hi\u1ec7n s\u1ef1 b\u1ea5t th\u01b0\u1eddng v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a ph\u00e2n t\u00edch b\u1ea3o m\u1eadt.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a:<\/strong> Khi m\u00e3 h\u00f3a tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n, nh\u1eefng k\u1ebb theo d\u00f5i g\u00f3i s\u1ebd c\u1ea7n ph\u00e1t tri\u1ec3n c\u00e1c k\u1ef9 thu\u1eadt t\u1ed1t h\u01a1n \u0111\u1ec3 ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn b\u1ea3o m\u1eadt.<\/p>\n<\/li>\n<li>\n<p><strong>M\u00f4i tr\u01b0\u1eddng \u0111\u00e1m m\u00e2y v\u00e0 \u1ea3o:<\/strong> Tr\u00ecnh nghe l\u00e9n g\u00f3i ph\u1ea3i th\u00edch \u1ee9ng v\u1edbi c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng \u0111ang ph\u00e1t tri\u1ec3n, bao g\u1ed3m c\u1ea3 m\u00f4i tr\u01b0\u1eddng d\u1ef1a tr\u00ean \u0111\u00e1m m\u00e2y v\u00e0 \u1ea3o h\u00f3a.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00edch h\u1ee3p IoT v\u00e0 5G:<\/strong> S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a Internet of Things (IoT) v\u00e0 vi\u1ec7c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i 5G s\u1ebd y\u00eau c\u1ea7u c\u00e1c tr\u00ecnh thu th\u1eadp d\u1eef li\u1ec7u g\u00f3i ph\u1ea3i x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111a d\u1ea1ng cao h\u01a1n.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi Packet Sniffer<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy v\u00e0 tr\u00ecnh th\u00e1m th\u00ednh g\u00f3i th\u01b0\u1eddng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft trong b\u1ed1i c\u1ea3nh gi\u00e1m s\u00e1t v\u00e0 b\u1ea3o m\u1eadt m\u1ea1ng. M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 internet, thay m\u1eb7t m\u00e1y kh\u00e1ch x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u. Khi k\u1ebft h\u1ee3p v\u1edbi tr\u00ecnh th\u00e1m th\u00ednh g\u00f3i, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 n\u1eafm b\u1eaft v\u00e0 ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111i qua n\u00f3, cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt v\u00e0 th\u00f4ng tin chi ti\u1ebft v\u1ec1 m\u1ea1ng.<\/p>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy \u0111\u01b0\u1ee3c trang b\u1ecb b\u1ed9 thu th\u1eadp g\u00f3i tin c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 sau:<\/p>\n<ol>\n<li>\n<p><strong>L\u1ecdc n\u1ed9i dung:<\/strong> S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean l\u1ecdc ra n\u1ed9i dung kh\u00f4ng mong mu\u1ed1n ho\u1eb7c \u0111\u1ed9c h\u1ea1i tr\u01b0\u1edbc khi n\u00f3 \u0111\u1ebfn thi\u1ebft b\u1ecb c\u1ee7a kh\u00e1ch h\u00e0ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n t\u00edch l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp:<\/strong> Kh\u1ea3 n\u0103ng n\u1eafm b\u1eaft l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp c\u1ee7a m\u00e1y ch\u1ee7 proxy cho ph\u00e9p gi\u00e1m s\u00e1t v\u00e0 ph\u00e2n t\u00edch c\u00e1c ho\u1ea1t \u0111\u1ed9ng m\u1ea1ng t\u1ed1t h\u01a1n, x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i \u0111e d\u1ecda ti\u1ec1m \u1ea9n ho\u1eb7c c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 hi\u1ec7u su\u1ea5t.<\/p>\n<\/li>\n<li>\n<p><strong>\u1ea8n danh v\u00e0 quy\u1ec1n ri\u00eang t\u01b0:<\/strong> M\u1ed9t s\u1ed1 m\u00e1y ch\u1ee7 proxy cung c\u1ea5p t\u00ednh n\u0103ng \u1ea9n danh v\u00e0 v\u1edbi tr\u00ecnh nghe l\u00e9n g\u00f3i, qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 x\u00e1c minh r\u1eb1ng m\u00e1y ch\u1ee7 th\u1ef1c s\u1ef1 \u0111ang \u1ea9n danh v\u00e0 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<\/li>\n<\/ol>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 tr\u00ecnh nghe l\u00e9n g\u00f3i, h\u00e3y xem x\u00e9t c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/www.wireshark.org\/\" target=\"_new\" rel=\"noopener nofollow\">Wireshark \u2013 C\u00f4ng c\u1ee5 ph\u00e2n t\u00edch giao th\u1ee9c m\u1ea1ng ph\u1ed5 bi\u1ebfn nh\u1ea5t th\u1ebf gi\u1edbi<\/a><\/li>\n<li><a href=\"https:\/\/www.tcpdump.org\/\" target=\"_new\" rel=\"noopener nofollow\">Tcpdump \u2013 Tr\u00ecnh ph\u00e2n t\u00edch g\u00f3i d\u00f2ng l\u1ec7nh m\u1ea1nh m\u1ebd<\/a><\/li>\n<li><a href=\"https:\/\/nmap.org\/\" target=\"_new\" rel=\"noopener nofollow\">Nmap \u2013 C\u00f4ng c\u1ee5 qu\u00e9t m\u1ea1ng \u0111a n\u0103ng<\/a><\/li>\n<li><a href=\"https:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/security-vpn\/kerberos\/13615-12.html\" target=\"_new\" rel=\"noopener nofollow\">Cisco \u2013 T\u00ecm hi\u1ec3u v\u00e0 c\u1ea5u h\u00ecnh packet sniffing tr\u00ean c\u00e1c router iOS<\/a><\/li>\n<\/ol>\n<p>T\u00f3m l\u1ea1i, tr\u00ecnh th\u00e1m th\u00ednh g\u00f3i \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong m\u1ea1ng m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i b\u1eb1ng c\u00e1ch cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean gi\u00e1m s\u00e1t, ph\u00e2n t\u00edch v\u00e0 b\u1ea3o m\u1eadt l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng. Ch\u00fang cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft c\u00f3 gi\u00e1 tr\u1ecb v\u1ec1 hi\u1ec7u su\u1ea5t m\u1ea1ng v\u00e0 c\u00e1c m\u1ed1i \u0111e d\u1ecda b\u1ea3o m\u1eadt ti\u1ec1m \u1ea9n. Khi c\u00f4ng ngh\u1ec7 ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, nh\u1eefng k\u1ebb \u0111\u00e1nh h\u01a1i g\u00f3i s\u1ebd th\u00edch \u1ee9ng v\u1edbi nh\u1eefng th\u00e1ch th\u1ee9c v\u00e0 c\u01a1 h\u1ed9i m\u1edbi, \u0111\u1ea3m b\u1ea3o t\u00ednh hi\u1ec7u qu\u1ea3 v\u00e0 b\u1ea3o m\u1eadt c\u1ee7a m\u1ea1ng trong t\u01b0\u01a1ng lai.<\/p>","protected":false},"featured_media":478322,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478321","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Packet Sniffer: A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is a packet sniffer?","answer":"<p>A packet sniffer, also known as a network analyzer or packet analyzer, is a tool used in computer networks to capture and analyze data packets as they pass through the network. It helps network administrators, cybersecurity experts, and developers monitor and inspect network traffic for troubleshooting and security purposes.<\/p>"},{"question":"How did packet sniffers originate?","answer":"<p>The concept of packet sniffing dates back to the 1970s during the development of ARPANET, the precursor to the modern internet. Researchers needed a way to monitor and analyze network traffic, leading to the creation of early packet sniffers.<\/p>"},{"question":"How does a packet sniffer work?","answer":"<p>A packet sniffer consists of several components, including a packet capture interface, a packet decoding engine, a packet analysis module, and a user interface. It captures data packets from the network, decodes their contents, analyzes the packets based on predefined rules, and presents the information to the user in a readable format.<\/p>"},{"question":"What are the key features of a packet sniffer?","answer":"<p>Packet sniffers offer protocol analysis, real-time monitoring, filtering and capture options, performance optimization, and security analysis. These features enable efficient network troubleshooting and threat detection.<\/p>"},{"question":"What types of packet sniffers exist?","answer":"<p>Packet sniffers can be classified into two main types: promiscuous mode sniffers and non-promiscuous mode sniffers. Promiscuous mode sniffers capture all packets on the network, including those not intended for the sniffer's interface, while non-promiscuous mode sniffers capture packets specifically sent to the host machine running the sniffer.<\/p>"},{"question":"How can packet sniffers be used, and what problems can arise?","answer":"<p>Packet sniffers have various applications, including network troubleshooting, security analysis, and performance optimization. However, concerns related to privacy, data overload, and legal and ethical considerations may arise. Solutions involve using encryption, setting up filters, and ensuring compliance with regulations.<\/p>"},{"question":"How do packet sniffers compare with NIDS and NIPS?","answer":"<p>Packet sniffers, Network Intrusion Detection Systems (NIDS), and Network Intrusion Prevention Systems (NIPS) differ in their main functions, monitoring scope, response to intrusions, complexity, and purposes. Packet sniffers focus on capturing and analyzing packets, while NIDS and NIPS are specifically designed for detecting and preventing intrusions.<\/p>"},{"question":"What are the future perspectives for packet sniffers?","answer":"<p>The future of packet sniffers lies in advancements like machine learning integration, encrypted traffic analysis, adaptation to cloud and virtual environments, and integration with IoT and 5G technologies. These developments will enhance the efficiency and security of network monitoring.<\/p>"},{"question":"How are proxy servers associated with packet sniffers?","answer":"<p>Proxy servers, when combined with packet sniffers, can capture and analyze traffic passing through them. This association allows for content filtering, traffic analysis, and ensuring anonymity and privacy for users.<\/p>"},{"question":"Is there more information available about packet sniffers?","answer":"<p>For more detailed information about packet sniffers, you can explore resources like Wireshark, Tcpdump, Nmap, and Cisco's documentation on packet sniffing. These tools and references provide valuable insights into using packet sniffers effectively for network analysis and security.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478321","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478321\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/478322"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=478321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}