{"id":478113,"date":"2023-08-09T09:27:35","date_gmt":"2023-08-09T09:27:35","guid":{"rendered":""},"modified":"2023-09-05T11:16:08","modified_gmt":"2023-09-05T11:16:08","slug":"netmask","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/netmask\/","title":{"rendered":"M\u1eb7t n\u1ea1 m\u1ea1ng"},"content":{"rendered":"<p>Netmask, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1eb7t n\u1ea1 m\u1ea1ng con, l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong m\u1ea1ng m\u00e1y t\u00ednh v\u00e0 l\u00e0 th\u00e0nh ph\u1ea7n quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00e1y ch\u1ee7 proxy. N\u00f3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c ph\u1ea7n m\u1ea1ng v\u00e0 m\u00e1y ch\u1ee7 c\u1ee7a \u0111\u1ecba ch\u1ec9 IP. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi c\u1ee7a m\u1ea1ng, m\u1eb7t n\u1ea1 m\u1ea1ng cho ph\u00e9p \u0111\u1ecbnh tuy\u1ebfn hi\u1ec7u qu\u1ea3 c\u00e1c g\u00f3i d\u1eef li\u1ec7u gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb v\u00e0 m\u1ea1ng.<\/p>\n<h2>L\u1ecbch s\u1eed v\u1ec1 ngu\u1ed3n g\u1ed1c c\u1ee7a Netmask v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n<p>Kh\u00e1i ni\u1ec7m v\u1ec1 m\u1eb7t n\u1ea1 m\u1ea1ng c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a m\u1ea1ng m\u00e1y t\u00ednh khi nhu c\u1ea7u ph\u00e2n \u0111o\u1ea1n \u0111\u1ecba ch\u1ec9 IP tr\u1edf n\u00ean r\u00f5 r\u00e0ng. N\u0103m 1981, L\u1ef1c l\u01b0\u1ee3ng \u0111\u1eb7c nhi\u1ec7m k\u1ef9 thu\u1eadt Internet (IETF) \u0111\u00e3 gi\u1edbi thi\u1ec7u Giao th\u1ee9c Internet phi\u00ean b\u1ea3n 4 (IPv4), trong \u0111\u00f3 m\u1eb7t n\u1ea1 m\u1ea1ng l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh ch\u00ednh th\u1ee9c d\u01b0\u1edbi d\u1ea1ng \u201cm\u1eb7t n\u1ea1 m\u1ea1ng con\u201d. N\u00f3 cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng chia \u0111\u1ecba ch\u1ec9 IP th\u00e0nh hai ph\u1ea7n: ti\u1ec1n t\u1ed1 m\u1ea1ng v\u00e0 m\u00e3 \u0111\u1ecbnh danh m\u00e1y ch\u1ee7. S\u1ef1 ph\u00e2n chia n\u00e0y cho ph\u00e9p ph\u00e2n b\u1ed5 \u0111\u1ecba ch\u1ec9 IP hi\u1ec7u qu\u1ea3 h\u01a1n v\u00e0 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a Internet.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Netmask: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Netmask<\/h2>\n<p>M\u1eb7t n\u1ea1 m\u1ea1ng l\u00e0 gi\u00e1 tr\u1ecb 32 bit \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng b\u1ed1n octet (v\u00ed d\u1ee5: 255.255.255.0). M\u1ed7i bit trong m\u1eb7t n\u1ea1 m\u1ea1ng t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t bit trong \u0111\u1ecba ch\u1ec9 IP, v\u1edbi gi\u00e1 tr\u1ecb 1 bi\u1ec3u th\u1ecb ph\u1ea7n m\u1ea1ng v\u00e0 gi\u00e1 tr\u1ecb 0 bi\u1ec3u th\u1ecb ph\u1ea7n m\u00e1y ch\u1ee7. M\u1eb7t n\u1ea1 m\u1ea1ng ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch th\u1ef1c hi\u1ec7n ph\u00e9p to\u00e1n AND logic theo bit v\u1edbi \u0111\u1ecba ch\u1ec9 IP, tr\u00edch xu\u1ea5t ti\u1ec1n t\u1ed1 m\u1ea1ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 kh\u00e1i ni\u1ec7m m\u1eb7t n\u1ea1 m\u1ea1ng, h\u00e3y xem x\u00e9t m\u1ed9t v\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n. Gi\u1ea3 s\u1eed ch\u00fang ta c\u00f3 \u0111\u1ecba ch\u1ec9 IP l\u00e0 192.168.1.100 v\u00e0 netmask l\u00e0 255.255.255.0. \u00c1p d\u1ee5ng ph\u00e9p to\u00e1n AND theo bit gi\u1eefa hai gi\u00e1 tr\u1ecb n\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn ti\u1ec1n t\u1ed1 m\u1ea1ng 192.168.1.0. C\u00e1c bit c\u00f2n l\u1ea1i (v\u00ed d\u1ee5: .100) \u0111\u1ea1i di\u1ec7n cho m\u00e3 \u0111\u1ecbnh danh m\u00e1y ch\u1ee7, cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb trong c\u00f9ng m\u1ed9t m\u1ea1ng giao ti\u1ebfp tr\u1ef1c ti\u1ebfp m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ecbnh tuy\u1ebfn.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Netmask: C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Netmask<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a m\u1eb7t n\u1ea1 m\u1ea1ng bao g\u1ed3m m\u1ed9t s\u1ed1 bit c\u1ed1 \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u00e0nh 1, theo sau l\u00e0 m\u1ed9t s\u1ed1 bit c\u1ed1 \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u00e0nh 0. S\u1ed1 bit \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u00e0nh 1 x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc c\u1ee7a ph\u1ea7n m\u1ea1ng, trong khi s\u1ed1 bit \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u00e0nh 0 x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc c\u1ee7a ph\u1ea7n m\u00e1y ch\u1ee7. \u0110\u1ed9 d\u00e0i c\u1ee7a ti\u1ec1n t\u1ed1 m\u1ea1ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201c\u0111\u1ed9 d\u00e0i ti\u1ec1n t\u1ed1 m\u1ea1ng con\u201d v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng k\u00fd hi\u1ec7u CIDR (v\u00ed d\u1ee5: \/24).<\/p>\n<p>V\u00ed d\u1ee5: m\u1eb7t n\u1ea1 m\u1ea1ng 255.255.255.0 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111\u1ed9 d\u00e0i ti\u1ec1n t\u1ed1 m\u1ea1ng con l\u00e0 \/24, cho bi\u1ebft 24 bit \u0111\u1ea7u ti\u00ean c\u1ee7a \u0111\u1ecba ch\u1ec9 IP \u0111\u1ea1i di\u1ec7n cho m\u1ea1ng v\u00e0 8 bit cu\u1ed1i c\u00f9ng \u0111\u1ea1i di\u1ec7n cho m\u00e1y ch\u1ee7.<\/p>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Netmask<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a netmask nh\u01b0 sau:<\/p>\n<ol>\n<li>\n<p><strong>Ph\u00e2n \u0111o\u1ea1n \u0111\u1ecba ch\u1ec9<\/strong>: M\u1eb7t n\u1ea1 m\u1ea1ng cho ph\u00e9p ph\u00e2n chia h\u1ee3p l\u00fd c\u00e1c \u0111\u1ecba ch\u1ec9 IP th\u00e0nh c\u00e1c ph\u1ea7n m\u1ea1ng v\u00e0 m\u00e1y ch\u1ee7, cho ph\u00e9p \u0111\u1ecbnh tuy\u1ebfn v\u00e0 \u0111\u00e1nh \u0111\u1ecba ch\u1ec9 hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<li>\n<p><strong>M\u1ea1ng con<\/strong>: M\u1ea1ng con l\u00e0 qu\u00e1 tr\u00ecnh chia m\u1ea1ng th\u00e0nh c\u00e1c m\u1ea1ng con nh\u1ecf h\u01a1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c m\u1eb7t n\u1ea1 m\u1ea1ng m\u1edf r\u1ed9ng h\u01a1n. \u0110i\u1ec1u n\u00e0y gi\u00fap t\u1ed1i \u01b0u h\u00f3a t\u00e0i nguy\u00ean m\u1ea1ng v\u00e0 gi\u1ea3m mi\u1ec1n ph\u00e1t s\u00f3ng.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ecbnh tuy\u1ebfn li\u00ean mi\u1ec1n kh\u00f4ng ph\u00e2n lo\u1ea1i (CIDR)<\/strong>: CIDR \u0111\u00e3 gi\u1edbi thi\u1ec7u m\u1ed9t c\u00e1ch ph\u00e2n b\u1ed5 \u0111\u1ecba ch\u1ec9 IP linh ho\u1ea1t h\u01a1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1eb7t n\u1ea1 m\u1ea1ng con c\u00f3 \u0111\u1ed9 d\u00e0i thay \u0111\u1ed5i, cho ph\u00e9p s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 h\u01a1n kh\u00f4ng gian \u0111\u1ecba ch\u1ec9 IPv4 c\u00f3 s\u1eb5n.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ecba ch\u1ec9 ri\u00eang<\/strong>: Netmask \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c d\u1ea3i \u0111\u1ecba ch\u1ec9 IP ri\u00eang, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c d\u1ea3i \u0111\u1ecba ch\u1ec9 IP trong ph\u1ea1m vi 10.0.0.0\/8, 172.16.0.0\/12 v\u00e0 192.168.0.0\/16, d\u00e0nh ri\u00eang cho vi\u1ec7c s\u1eed d\u1ee5ng n\u1ed9i b\u1ed9 trong c\u00e1c t\u1ed5 ch\u1ee9c.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i m\u1eb7t n\u1ea1 m\u1ea1ng<\/h2>\n<p>C\u00f3 m\u1ed9t s\u1ed1 lo\u1ea1i m\u1eb7t n\u1ea1 m\u1ea1ng ph\u1ed5 bi\u1ebfn d\u1ef1a tr\u00ean \u0111\u1ed9 d\u00e0i ti\u1ec1n t\u1ed1 m\u1ea1ng con:<\/p>\n<table>\n<thead>\n<tr>\n<th>M\u1eb7t n\u1ea1 m\u1ea1ng<\/th>\n<th>\u0110\u1ed9 d\u00e0i ti\u1ec1n t\u1ed1 m\u1ea1ng con<\/th>\n<th>\u0110\u1ecba ch\u1ec9 m\u00e1y ch\u1ee7 c\u00f3 s\u1eb5n<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>255.0.0.0<\/td>\n<td>\/8<\/td>\n<td>16,777,214<\/td>\n<td>M\u1eb7t n\u1ea1 m\u1ea1ng lo\u1ea1i A<\/td>\n<\/tr>\n<tr>\n<td>255.255.0.0<\/td>\n<td>\/16<\/td>\n<td>65,534<\/td>\n<td>M\u1eb7t n\u1ea1 m\u1ea1ng lo\u1ea1i B<\/td>\n<\/tr>\n<tr>\n<td>255.255.255.0<\/td>\n<td>\/24<\/td>\n<td>254<\/td>\n<td>M\u1eb7t n\u1ea1 m\u1ea1ng lo\u1ea1i C<\/td>\n<\/tr>\n<tr>\n<td>255.255.255.128<\/td>\n<td>\/25<\/td>\n<td>126<\/td>\n<td>Subnet Mask cho 128 \u0111\u1ecba ch\u1ec9 IP<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng Netmask, 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<h3>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng Netmask:<\/h3>\n<ol>\n<li>\n<p><strong>c\u1ea5u h\u00ecnh m\u1ea1ng<\/strong>: Netmask l\u00e0 th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n trong vi\u1ec7c \u0111\u1ecbnh c\u1ea5u h\u00ecnh c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng, b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn v\u00e0 t\u01b0\u1eddng l\u1eeda. Ch\u00fang \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c g\u00f3i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn ph\u00f9 h\u1ee3p gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb v\u00e0 m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>M\u1ea1ng con<\/strong>: Netmask r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ec3 chia m\u1ed9t m\u1ea1ng l\u1edbn th\u00e0nh c\u00e1c m\u1ea1ng con nh\u1ecf h\u01a1n, gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 v\u00e0 b\u1ea3o m\u1eadt m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n b\u1ed5 \u0111\u1ecba ch\u1ec9 IP<\/strong>: Netmask h\u1ed7 tr\u1ee3 ph\u00e2n b\u1ed5 \u0111\u1ecba ch\u1ec9 IP cho c\u00e1c thi\u1ebft b\u1ecb tr\u00ean m\u1ea1ng, ng\u0103n ng\u1eeba xung \u0111\u1ed9t v\u00e0 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng kh\u00f4ng gian \u0111\u1ecba ch\u1ec9.<\/p>\n<\/li>\n<\/ol>\n<h3>V\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p:<\/h3>\n<ol>\n<li>\n<p><strong>M\u1ea1ng con kh\u00f4ng ch\u00ednh x\u00e1c<\/strong>: Vi\u1ec7c chia m\u1ea1ng con kh\u00f4ng \u0111\u00fang c\u00e1ch c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c ph\u00e2n b\u1ed5 \u0111\u1ecba ch\u1ec9 IP kh\u00f4ng hi\u1ec7u qu\u1ea3 v\u00e0 l\u00e0m t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a m\u1ea1ng. Qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng ph\u1ea3i l\u1eadp k\u1ebf ho\u1ea1ch v\u00e0 thi\u1ebft k\u1ebf c\u1ea9n th\u1eadn c\u00e1c s\u01a1 \u0111\u1ed3 m\u1ea1ng con c\u1ee7a h\u1ecd.<\/p>\n<\/li>\n<li>\n<p><strong>C\u1ea1n ki\u1ec7t \u0111\u1ecba ch\u1ec9 IP<\/strong>: V\u1edbi s\u1ef1 c\u1ea1n ki\u1ec7t c\u1ee7a \u0111\u1ecba ch\u1ec9 IPv4, nhu c\u1ea7u s\u1eed d\u1ee5ng IPv6 ng\u00e0y c\u00e0ng t\u0103ng, cung c\u1ea5p kh\u00f4ng gian \u0111\u1ecba ch\u1ec9 r\u1ed9ng l\u1edbn v\u00e0 lo\u1ea1i b\u1ecf nhu c\u1ea7u chia m\u1ea1ng con.<\/p>\n<\/li>\n<li>\n<p><strong>Xung \u0111\u1ed9t m\u1ea1ng con<\/strong>: M\u1eb7t n\u1ea1 m\u1ea1ng \u0111\u01b0\u1ee3c \u0111\u1ecbnh c\u1ea5u h\u00ecnh sai c\u00f3 th\u1ec3 g\u00e2y ra xung \u0111\u1ed9t \u0111\u1ecba ch\u1ec9 IP, d\u1eabn \u0111\u1ebfn s\u1ef1 c\u1ed1 k\u1ebft n\u1ed1i. Qu\u1ea3n tr\u1ecb m\u1ea1ng n\u00ean s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 qu\u1ea3n l\u00fd \u0111\u1ecba ch\u1ec9 IP \u0111\u1ec3 tr\u00e1nh xung \u0111\u1ed9t.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<h3>Netmask so v\u1edbi c\u1ed5ng<\/h3>\n<p>M\u1eb7t n\u1ea1 m\u1ea1ng v\u00e0 c\u1ed5ng ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch kh\u00e1c nhau trong m\u1ea1ng. M\u1eb7t n\u1ea1 m\u1ea1ng x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi gi\u1eefa ph\u1ea7n m\u1ea1ng v\u00e0 ph\u1ea7n m\u00e1y ch\u1ee7 c\u1ee7a \u0111\u1ecba ch\u1ec9 IP, cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb trong c\u00f9ng m\u1ed9t m\u1ea1ng giao ti\u1ebfp tr\u1ef1c ti\u1ebfp. M\u1eb7t kh\u00e1c, m\u1ed9t c\u1ed5ng (th\u01b0\u1eddng l\u00e0 b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn) c\u00f3 nhi\u1ec7m v\u1ee5 chuy\u1ec3n ti\u1ebfp c\u00e1c g\u00f3i d\u1eef li\u1ec7u gi\u1eefa c\u00e1c m\u1ea1ng kh\u00e1c nhau, cho ph\u00e9p li\u00ean l\u1ea1c gi\u1eefa c\u00e1c m\u1ea1ng.<\/p>\n<h3>M\u1eb7t n\u1ea1 m\u1ea1ng so v\u1edbi CIDR<\/h3>\n<p>CIDR (\u0110\u1ecbnh tuy\u1ebfn gi\u1eefa c\u00e1c mi\u1ec1n kh\u00f4ng ph\u00e2n lo\u1ea1i) l\u00e0 k\u00fd hi\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ec3u th\u1ecb m\u1eb7t n\u1ea1 m\u1ea1ng con c\u00f3 \u0111\u1ed9 d\u00e0i thay \u0111\u1ed5i. Trong khi netmask x\u00e1c \u0111\u1ecbnh m\u1eb7t n\u1ea1 m\u1ea1ng con c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ed1 \u0111\u1ecbnh v\u1edbi s\u1ed1 bit c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t th\u00e0nh 1, CIDR cho ph\u00e9p linh ho\u1ea1t h\u01a1n b\u1eb1ng c\u00e1ch ch\u1ec9 \u0111\u1ecbnh s\u1ed1 bit trong ti\u1ec1n t\u1ed1 m\u1ea1ng con. V\u00ed d\u1ee5: m\u1eb7t n\u1ea1 m\u1ea1ng 255.255.255.0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng \/24 trong k\u00fd hi\u1ec7u CIDR.<\/p>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Netmask<\/h2>\n<p>Khi internet ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, c\u00e1c qu\u1ea3n tr\u1ecb vi\u00ean v\u00e0 k\u1ef9 s\u01b0 m\u1ea1ng s\u1ebd c\u1ea7n ph\u1ea3i th\u00edch \u1ee9ng v\u1edbi nhu c\u1ea7u ng\u00e0y c\u00e0ng t\u0103ng v\u1ec1 \u0111\u1ecba ch\u1ec9 IP. Vi\u1ec7c \u00e1p d\u1ee5ng IPv6, v\u1edbi kh\u00f4ng gian \u0111\u1ecba ch\u1ec9 r\u1ed9ng l\u1edbn, s\u1ebd l\u00e0m gi\u1ea3m s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ea1ng con v\u00e0 m\u1eb7t n\u1ea1 m\u1ea1ng trong khi cho ph\u00e9p m\u1edf r\u1ed9ng Internet m\u1ed9t c\u00e1ch li\u1ec1n m\u1ea1ch.<\/p>\n<p>Ngo\u00e0i ra, nh\u1eefng ti\u1ebfn b\u1ed9 trong t\u1ef1 \u0111\u1ed9ng h\u00f3a m\u1ea1ng v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o s\u1ebd h\u1ee3p l\u00fd h\u00f3a c\u1ea5u h\u00ecnh v\u00e0 qu\u1ea3n l\u00fd m\u1eb7t n\u1ea1 m\u1ea1ng, gi\u00fap vi\u1ec7c qu\u1ea3n tr\u1ecb m\u1ea1ng hi\u1ec7u qu\u1ea3 h\u01a1n v\u00e0 kh\u00f4ng c\u00f3 l\u1ed7i.<\/p>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi Netmask<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong b\u1ea3o m\u1eadt m\u1ea1ng v\u00e0 \u1ea9n danh. B\u1eb1ng c\u00e1ch \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 m\u1ee5c ti\u00eau, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1eb7t n\u1ea1 m\u1ea1ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c ch\u00ednh s\u00e1ch danh s\u00e1ch tr\u1eafng v\u00e0 danh s\u00e1ch \u0111en IP, h\u1ea1n ch\u1ebf ho\u1eb7c cho ph\u00e9p truy c\u1eadp d\u1ef1a tr\u00ean d\u1ea3i \u0111\u1ecba ch\u1ec9 IP.<\/p>\n<p>C\u00e1c nh\u00e0 cung c\u1ea5p proxy nh\u01b0 OneProxy c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1eb7t n\u1ea1 m\u1ea1ng \u0111\u1ec3 qu\u1ea3n l\u00fd c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u00e1y ch\u1ee7 proxy c\u1ee7a h\u1ecd m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. B\u1eb1ng c\u00e1ch t\u1ed5 ch\u1ee9c c\u00e1c \u0111\u1ecba ch\u1ec9 IP proxy c\u1ee7a h\u1ecd th\u00e0nh c\u00e1c m\u1ea1ng con kh\u00e1c nhau, h\u1ecd c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c \u0111\u1ecbnh tuy\u1ebfn v\u00e0 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t cao.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 m\u1eb7t n\u1ea1 m\u1ea1ng v\u00e0 c\u00e1c kh\u00e1i ni\u1ec7m m\u1ea1ng li\u00ean quan, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/ip\/routing-information-protocol-rip\/13788-3.html\" target=\"_new\" rel=\"noopener nofollow\">Gi\u1edbi thi\u1ec7u v\u1ec1 m\u1ea1ng con<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/network-layer\/what-is-cidr\/\" target=\"_new\" rel=\"noopener nofollow\">Hi\u1ec3u CIDR<\/a><\/li>\n<li><a href=\"https:\/\/www.arin.net\/resources\/what-is-ipv6\/\" target=\"_new\" rel=\"noopener nofollow\">IPv6: T\u01b0\u01a1ng lai c\u1ee7a Internet<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/glossary\/proxy-server\/\" target=\"_new\" rel=\"noopener nofollow\">M\u00e1y ch\u1ee7 proxy v\u00e0 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee7a ch\u00fang<\/a><\/li>\n<\/ol>\n<p>T\u00f3m l\u1ea1i, m\u1eb7t n\u1ea1 m\u1ea1ng l\u00e0 m\u1ed9t kh\u00eda c\u1ea1nh n\u1ec1n t\u1ea3ng c\u1ee7a m\u1ea1ng m\u00e1y t\u00ednh, cho ph\u00e9p ph\u00e2n b\u1ed5, \u0111\u1ecbnh tuy\u1ebfn v\u00e0 chia m\u1ea1ng con hi\u1ec7u qu\u1ea3. Khi Internet ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, vi\u1ec7c hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng m\u1eb7t n\u1ea1 m\u1ea1ng s\u1ebd v\u1eabn r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng an to\u00e0n v\u00e0 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng.<\/p>","protected":false},"featured_media":478114,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478113","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Netmask: Unraveling the Subnetting Enigma<\/mark>","faq_items":[{"question":"<strong>What is a netmask, and why is it important for networking?<\/strong>","answer":"<p>A netmask, also known as a subnet mask, is a fundamental concept in networking that helps divide IP addresses into two parts: the network portion and the host portion. It plays a crucial role in efficient data routing between devices and networks, ensuring seamless communication.<\/p>"},{"question":"<strong>How did the concept of netmasks originate?<\/strong>","answer":"<p>The concept of netmasks traces back to the early days of computer networking when the Internet Engineering Task Force (IETF) introduced the Internet Protocol version 4 (IPv4) in 1981. This protocol defined the concept of subnet masks to allocate IP addresses more efficiently and facilitate the growth of the internet.<\/p>"},{"question":"<strong>How does a netmask work internally?<\/strong>","answer":"<p>A netmask is a 32-bit value represented by four octets (e.g., 255.255.255.0). Each bit in the netmask corresponds to a bit in the IP address, with 1 indicating the network part and 0 indicating the host part. By performing a bitwise AND operation with an IP address, the netmask extracts the network prefix, enabling devices to determine if they are part of the same network.<\/p>"},{"question":"<strong>What are the key features of netmasks?<\/strong>","answer":"<p>The key features of netmasks include:<\/p><ol><li>Address Segmentation: Dividing IP addresses into network and host parts for efficient routing.<\/li><li>Subnetting: Creating smaller subnetworks for better resource utilization and security.<\/li><li>Classless Inter-Domain Routing (CIDR): Using variable-length subnet masks for flexible IP allocation.<\/li><li>Private Addressing: Defining IP ranges reserved for internal use within organizations.<\/li><\/ol>"},{"question":"<strong>What types of netmasks are there?<\/strong>","answer":"<p>Netmasks come in various types based on the subnet prefix length. Some common examples include:<\/p><ul><li>255.0.0.0 (\/8) - Class A Netmask<\/li><li>255.255.0.0 (\/16) - Class B Netmask<\/li><li>255.255.255.0 (\/24) - Class C Netmask<\/li><li>255.255.255.128 (\/25) - Subnet Mask for 128 IP addresses<\/li><\/ul>"},{"question":"<strong>How are netmasks used in networking?<\/strong>","answer":"<p>Netmasks are essential for configuring network devices, routers, and firewalls. They enable subnetting, which optimizes IP address allocation and reduces broadcast domains. Additionally, netmasks facilitate IP address management and prevent conflicts.<\/p>"},{"question":"<strong>What are common problems related to netmask use, and how can they be resolved?<\/strong>","answer":"<p>Common issues include incorrect subnetting leading to inefficient address allocation and IP conflicts. Network administrators must plan subnetting schemes carefully and use IP address management tools to avoid conflicts.<\/p>"},{"question":"<strong>How does the future of netmasks look like in the ever-evolving networking landscape?<\/strong>","answer":"<p>As the internet grows, the adoption of IPv6 with its vast address space will reduce the reliance on subnetting and netmasks. Advancements in network automation and AI will streamline configuration, making network administration more efficient.<\/p>"},{"question":"<strong>How are proxy servers associated with netmasks?<\/strong>","answer":"<p>Proxy servers use netmasks to implement IP whitelisting and blacklisting, controlling access based on IP ranges. Proxy providers like OneProxy may use netmasks to organize their proxy IP addresses efficiently for optimal performance.<\/p>"},{"question":"<strong>Where can I find more information about netmasks and related networking concepts?<\/strong>","answer":"<p>For further insights, you can explore the following resources:<\/p><ol><li><a href=\"https:\/\/www.cisco.com\/c\/en\/us\/support\/docs\/ip\/routing-information-protocol-rip\/13788-3.html\" target=\"_new\">Introduction to Subnetting<\/a><\/li><li><a href=\"https:\/\/www.cloudflare.com\/learning\/network-layer\/what-is-cidr\/\" target=\"_new\">Understanding CIDR<\/a><\/li><li><a href=\"https:\/\/www.arin.net\/resources\/what-is-ipv6\/\" target=\"_new\">IPv6: The Future of the Internet<\/a><\/li><li><a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/glossary\/proxy-server\/\" target=\"_new\">Proxy Servers and Their Use Cases<\/a><\/li><\/ol>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478113","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\/478113\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/478114"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=478113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}