{"id":477662,"date":"2023-08-09T09:18:35","date_gmt":"2023-08-09T09:18:35","guid":{"rendered":""},"modified":"2023-09-05T11:15:09","modified_gmt":"2023-09-05T11:15:09","slug":"internet-control-message-protocol","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/internet-control-message-protocol\/","title":{"rendered":"Giao th\u1ee9c Th\u00f4ng b\u00e1o Ki\u1ec3m so\u00e1t Internet"},"content":{"rendered":"<h2>Gi\u1edbi thi\u1ec7u<\/h2>\n<p>Giao th\u1ee9c th\u00f4ng b\u00e1o \u0111i\u1ec1u khi\u1ec3n Internet (ICMP) l\u00e0 giao th\u1ee9c l\u1edbp m\u1ea1ng thi\u1ebft y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed9 Giao th\u1ee9c Internet (IP). N\u00f3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u1ea1o \u0111i\u1ec1u ki\u1ec7n li\u00ean l\u1ea1c gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb tr\u00ean m\u1ea1ng v\u00e0 ph\u1ee5c v\u1ee5 c\u00e1c ch\u1ee9c n\u0103ng ch\u1ea9n \u0111o\u00e1n v\u00e0 b\u00e1o c\u00e1o l\u1ed7i kh\u00e1c nhau. ICMP th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu c\u1ee7a m\u1ea1ng hi\u1ec7n \u0111\u1ea1i, cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng trao \u0111\u1ed5i c\u00e1c th\u00f4ng b\u00e1o \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng c\u1ee7a c\u00e1c m\u1ea1ng d\u1ef1a tr\u00ean IP.<\/p>\n<h2>L\u1ecbch s\u1eed v\u00e0 ngu\u1ed3n g\u1ed1c<\/h2>\n<p>ICMP ban \u0111\u1ea7u \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0o \u0111\u1ea7u nh\u1eefng n\u0103m 1980 nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a \u0111\u1eb7c t\u1ea3 TCP\/IP ban \u0111\u1ea7u, \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong RFC 792. Vi\u1ec7c t\u1ea1o ra n\u00f3 c\u00f3 th\u1ec3 l\u00e0 do Dave Mills, ng\u01b0\u1eddi \u0111\u00e3 ph\u00e1c th\u1ea3o c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n v\u1ec1 ICMP trong c\u00f4ng tr\u00ecnh c\u1ee7a m\u00ecnh v\u1ec1 Giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n truy\u1ec1n d\u1eabn (TCP) v\u00e0 IP. K\u1ec3 t\u1eeb \u0111\u00f3, ICMP \u0111\u00e3 tr\u1ea3i qua nhi\u1ec1u l\u1ea7n s\u1eeda \u0111\u1ed5i v\u00e0 c\u1eadp nh\u1eadt, v\u1edbi c\u00e1c ch\u1ee9c n\u0103ng m\u1edbi \u0111\u01b0\u1ee3c b\u1ed5 sung theo th\u1eddi gian.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 ICMP<\/h2>\n<p>ICMP ho\u1ea1t \u0111\u1ed9ng \u1edf l\u1edbp m\u1ea1ng (L\u1edbp 3) c\u1ee7a m\u00f4 h\u00ecnh OSI, ho\u1ea1t \u0111\u1ed9ng c\u00f9ng v\u1edbi IP. Nhi\u1ec7m v\u1ee5 ch\u00ednh c\u1ee7a n\u00f3 bao g\u1ed3m b\u00e1o c\u00e1o l\u1ed7i, ch\u1ee9c n\u0103ng ch\u1ea9n \u0111o\u00e1n v\u00e0 cung c\u1ea5p ph\u1ea3n h\u1ed3i v\u1ec1 t\u00ecnh tr\u1ea1ng m\u1ea1ng. ICMP l\u00e0 giao th\u1ee9c kh\u00f4ng k\u1ebft n\u1ed1i, ngh\u0129a l\u00e0 n\u00f3 kh\u00f4ng thi\u1ebft l\u1eadp phi\u00ean d\u00e0nh ri\u00eang tr\u01b0\u1edbc khi truy\u1ec1n tin nh\u1eafn. Thay v\u00e0o \u0111\u00f3, n\u00f3 s\u1eed d\u1ee5ng c\u00e1c d\u1ecbch v\u1ee5 c\u1ee7a IP \u0111\u1ec3 g\u1eedi th\u00f4ng \u0111i\u1ec7p c\u1ee7a m\u00ecnh.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong v\u00e0 c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ICMP<\/h2>\n<p>Th\u00f4ng \u0111i\u1ec7p ICMP \u0111\u01b0\u1ee3c g\u00f3i g\u1ecdn trong c\u00e1c g\u00f3i IP. Khi b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn ho\u1eb7c m\u00e1y ch\u1ee7 g\u1eb7p s\u1ef1 c\u1ed1 trong khi x\u1eed l\u00fd g\u00f3i IP, n\u00f3 s\u1ebd t\u1ea1o th\u00f4ng b\u00e1o ICMP \u0111\u1ec3 th\u00f4ng b\u00e1o cho thi\u1ebft b\u1ecb ngu\u1ed3n v\u1ec1 s\u1ef1 c\u1ed1. V\u00ed d\u1ee5: n\u1ebfu b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn nh\u1eadn \u0111\u01b0\u1ee3c g\u00f3i IP d\u00e0nh cho m\u00e1y ch\u1ee7 kh\u00f4ng t\u1ed3n t\u1ea1i, n\u00f3 s\u1ebd t\u1ea1o th\u00f4ng b\u00e1o ICMP \u201cDestination Unreachable\u201d \u0111\u1ec3 th\u00f4ng b\u00e1o cho ng\u01b0\u1eddi g\u1eedi.<\/p>\n<p>ICMP d\u1ef1a tr\u00ean nhi\u1ec1u lo\u1ea1i tin nh\u1eafn kh\u00e1c nhau, m\u1ed7i lo\u1ea1i ph\u1ee5c v\u1ee5 m\u1ed9t m\u1ee5c \u0111\u00edch c\u1ee5 th\u1ec3. M\u1ed9t s\u1ed1 lo\u1ea1i tin nh\u1eafn ICMP ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ul>\n<li>Y\u00eau c\u1ea7u ti\u1ebfng vang v\u00e0 Tr\u1ea3 l\u1eddi ti\u1ebfng vang (\u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ti\u1ec7n \u00edch \u201cping\u201d n\u1ed5i ti\u1ebfng \u0111\u1ec3 ki\u1ec3m tra k\u1ebft n\u1ed1i m\u1ea1ng).<\/li>\n<li>Kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u00edch (cho bi\u1ebft m\u00e1y ch\u1ee7 ho\u1eb7c m\u1ea1ng \u0111\u00edch kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c).<\/li>\n<li>\u0110\u00e3 v\u01b0\u1ee3t qu\u00e1 th\u1eddi gian (\u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ec9 ra r\u1eb1ng g\u00f3i \u0111\u00e3 v\u01b0\u1ee3t qu\u00e1 gi\u00e1 tr\u1ecb th\u1eddi gian t\u1ed3n t\u1ea1i c\u1ee7a n\u00f3 v\u00e0 b\u1ecb lo\u1ea1i b\u1ecf).<\/li>\n<li>Chuy\u1ec3n h\u01b0\u1edbng (th\u00f4ng b\u00e1o cho m\u00e1y ch\u1ee7 g\u1eedi g\u00f3i b\u1eb1ng tuy\u1ebfn \u0111\u01b0\u1eddng thay th\u1ebf).<\/li>\n<\/ul>\n<p>Th\u00f4ng b\u00e1o ICMP \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng tr\u01b0\u1eddng lo\u1ea1i v\u00e0 tr\u01b0\u1eddng m\u00e3, cho ph\u00e9p ph\u00e2n lo\u1ea1i l\u1ed7i c\u1ee5 th\u1ec3. Tr\u01b0\u1eddng t\u1ed5ng ki\u1ec3m tra \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c minh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a th\u00f4ng b\u00e1o ICMP.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a ICMP<\/h2>\n<p>ICMP cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu c\u1ee7a c\u00e1c m\u1ea1ng d\u1ef1a tr\u00ean IP:<\/p>\n<ol>\n<li>\n<p><strong>B\u00e1o c\u00e1o l\u1ed7i<\/strong>: ICMP t\u1ea1o \u0111i\u1ec1u ki\u1ec7n b\u00e1o c\u00e1o l\u1ed7i gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng, gi\u00fap x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 nhanh ch\u00f3ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ch\u1ee9c n\u0103ng ch\u1ea9n \u0111o\u00e1n<\/strong>: N\u00f3 h\u1ed7 tr\u1ee3 c\u00e1c c\u00f4ng c\u1ee5 ch\u1ea9n \u0111o\u00e1n nh\u01b0 \u201cping\u201d v\u00e0 \u201ctraceroute\u201d, h\u1ed7 tr\u1ee3 qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>X\u00e1c minh \u0111\u01b0\u1eddng d\u1eabn m\u1ea1ng<\/strong>: C\u00e1c th\u00f4ng b\u00e1o ICMP nh\u01b0 \u201c\u0110\u00e3 v\u01b0\u1ee3t qu\u00e1 th\u1eddi gian\u201d v\u00e0 \u201cChuy\u1ec3n h\u01b0\u1edbng\u201d h\u1ed7 tr\u1ee3 x\u00e1c \u0111\u1ecbnh t\u00ednh hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a \u0111\u01b0\u1eddng d\u1eabn m\u1ea1ng.<\/p>\n<\/li>\n<li>\n<p><strong>Ki\u1ec3m so\u00e1t l\u01b0u l\u01b0\u1ee3ng<\/strong>: ICMP \u0111\u00f3ng vai tr\u00f2 ki\u1ec3m so\u00e1t lu\u1ed3ng, th\u00f4ng b\u00e1o cho thi\u1ebft b\u1ecb v\u1ec1 t\u00ecnh tr\u1ea1ng m\u1ea1ng b\u1ecb t\u1eafc ngh\u1ebdn.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i tin nh\u1eafn ICMP<\/h2>\n<p>ICMP bao g\u1ed3m nhi\u1ec1u lo\u1ea1i tin nh\u1eafn kh\u00e1c nhau, m\u1ed7i lo\u1ea1i ph\u1ee5c v\u1ee5 m\u1ed9t m\u1ee5c \u0111\u00edch ri\u00eang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 danh s\u00e1ch m\u1ed9t s\u1ed1 lo\u1ea1i th\u00f4ng b\u00e1o ICMP ph\u1ed5 bi\u1ebfn:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i ICMP<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>Tr\u1ea3 l\u1eddi ti\u1ebfng vang<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u0110i\u1ec3m \u0111\u1ebfn kh\u00f4ng th\u1ec3 truy c\u1eadp<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>Chuy\u1ec3n h\u01b0\u1edbng<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>Y\u00eau c\u1ea7u echo<\/td>\n<\/tr>\n<tr>\n<td>11<\/td>\n<td>\u0110\u00e3 v\u01b0\u1ee3t qu\u00e1 th\u1eddi gian<\/td>\n<\/tr>\n<tr>\n<td>\u2026<\/td>\n<td>\u2026<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng, v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>ICMP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong ch\u1ea9n \u0111o\u00e1n m\u1ea1ng, x\u1eed l\u00fd s\u1ef1 c\u1ed1 v\u00e0 gi\u00e1m s\u00e1t hi\u1ec7u su\u1ea5t. M\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>Ki\u1ec3m tra k\u1ebft n\u1ed1i v\u00e0 Ping<\/strong>: C\u00e1c tin nh\u1eafn Y\u00eau c\u1ea7u ti\u1ebfng vang v\u00e0 Tr\u1ea3 l\u1eddi ti\u1ebfng vang c\u1ee7a ICMP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c minh k\u1ebft n\u1ed1i m\u1ea1ng v\u00e0 \u0111o th\u1eddi gian kh\u1ee9 h\u1ed3i (RTT).<\/p>\n<\/li>\n<li>\n<p><strong>Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng<\/strong>: Th\u00f4ng b\u00e1o ICMP Destination Unreachable gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 m\u00e1y ch\u1ee7 ho\u1eb7c m\u1ea1ng kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c.<\/p>\n<\/li>\n<li>\n<p><strong>Theo d\u00f5i \u0111\u01b0\u1eddng d\u1eabn<\/strong>: Traceroute s\u1eed d\u1ee5ng c\u00e1c tin nh\u1eafn \u0110\u00e3 v\u01b0\u1ee3t qu\u00e1 th\u1eddi gian ICMP \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng d\u1eabn m\u00e0 c\u00e1c g\u00f3i \u0111i qua m\u1ea1ng.<\/p>\n<\/li>\n<\/ol>\n<p>M\u1eb7c d\u00f9 c\u00f3 vai tr\u00f2 quan tr\u1ecdng nh\u01b0ng ICMP c\u00f3 th\u1ec3 l\u00e0 m\u1ee5c ti\u00eau cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c h\u1ea1i, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u1ea5n c\u00f4ng l\u0169 l\u1ee5t ICMP v\u00e0 qu\u00e9t ping. Qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng s\u1eed d\u1ee5ng t\u01b0\u1eddng l\u1eeda v\u00e0 h\u1ec7 th\u1ed1ng ng\u0103n ch\u1eb7n x\u00e2m nh\u1eadp \u0111\u1ec3 gi\u1ea3m thi\u1ec3u nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n<h2>\u0110\u1eb7c \u0111i\u1ec3m v\u00e0 so s\u00e1nh<\/h2>\n<p>H\u00e3y so s\u00e1nh ICMP v\u1edbi c\u00e1c giao th\u1ee9c kh\u00e1c v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m:<\/p>\n<table>\n<thead>\n<tr>\n<th>Giao th\u1ee9c<\/th>\n<th>L\u1edbp<\/th>\n<th>\u0110\u1ecbnh h\u01b0\u1edbng k\u1ebft n\u1ed1i<\/th>\n<th>B\u00e1o c\u00e1o l\u1ed7i<\/th>\n<th>M\u1ee5c \u0111\u00edch<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ICMP<\/td>\n<td>L\u1edbp 3<\/td>\n<td>KH\u00d4NG<\/td>\n<td>\u0110\u00fang<\/td>\n<td>Ch\u1ea9n \u0111o\u00e1n v\u00e0 ki\u1ec3m so\u00e1t m\u1ea1ng<\/td>\n<\/tr>\n<tr>\n<td>TCP<\/td>\n<td>L\u1edbp 4<\/td>\n<td>\u0110\u00fang<\/td>\n<td>\u0110\u00fang<\/td>\n<td>Truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>L\u1edbp 4<\/td>\n<td>KH\u00d4NG<\/td>\n<td>KH\u00d4NG<\/td>\n<td>Truy\u1ec1n d\u1eef li\u1ec7u c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1ea5p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng lai<\/h2>\n<p>Khi c\u00f4ng ngh\u1ec7 ti\u1ebfn b\u1ed9, ICMP c\u00f3 th\u1ec3 s\u1ebd ti\u1ebfp t\u1ee5c \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c ch\u1ea9n \u0111o\u00e1n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng. V\u1edbi s\u1ef1 gia t\u0103ng c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb Internet of Things (IoT) v\u00e0 vi\u1ec7c tri\u1ec3n khai IPv6, ICMP c\u00f3 th\u1ec3 s\u1ebd c\u00f3 nh\u1eefng b\u01b0\u1edbc ph\u00e1t tri\u1ec3n h\u01a1n n\u1eefa \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u m\u1edbi.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 ICMP<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7, chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u c\u1ee7a m\u00e1y kh\u00e1ch v\u00e0 nh\u1eadn ph\u1ea3n h\u1ed3i c\u1ee7a m\u00e1y ch\u1ee7. M\u1eb7c d\u00f9 c\u00e1c m\u00e1y ch\u1ee7 proxy ch\u1ee7 y\u1ebfu ho\u1ea1t \u0111\u1ed9ng \u1edf l\u1edbp \u1ee9ng d\u1ee5ng nh\u01b0ng ch\u00fang c\u0169ng c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng v\u1edbi c\u00e1c th\u00f4ng b\u00e1o ICMP \u1edf m\u1ed9t m\u1ee9c \u0111\u1ed9 n\u00e0o \u0111\u00f3. Tuy nhi\u00ean, c\u00e1c th\u00f4ng b\u00e1o ICMP th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u00f3i g\u1ecdn trong giao ti\u1ebfp c\u1ee7a proxy v\u00e0 c\u00f3 th\u1ec3 kh\u00f4ng hi\u1ec3n th\u1ecb tr\u1ef1c ti\u1ebfp \u0111\u1ed1i v\u1edbi m\u00e1y kh\u00e1ch ho\u1eb7c m\u00e1y ch\u1ee7.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 Giao th\u1ee9c tin nh\u1eafn \u0111i\u1ec1u khi\u1ec3n Internet, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc792\" target=\"_new\" rel=\"noopener nofollow\">RFC 792 - Giao th\u1ee9c tin nh\u1eafn \u0111i\u1ec1u khi\u1ec3n Internet<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Internet_Control_Message_Protocol\" target=\"_new\" rel=\"noopener nofollow\">ICMP tr\u00ean Wikipedia<\/a><\/li>\n<li><a href=\"https:\/\/www.iana.org\/assignments\/icmp-parameters\" target=\"_new\" rel=\"noopener nofollow\">Th\u00f4ng s\u1ed1 ICMP c\u1ee7a C\u01a1 quan c\u1ea5p s\u1ed1 \u0111\u01b0\u1ee3c g\u00e1n Internet (IANA)<\/a><\/li>\n<\/ol>","protected":false},"featured_media":477663,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477662","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Internet Control Message Protocol (ICMP) - A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is Internet Control Message Protocol (ICMP)?","answer":"<p>ICMP, or Internet Control Message Protocol, is a fundamental network layer protocol that operates within the Internet Protocol (IP) suite. It facilitates communication between devices on a network and serves various diagnostic and error reporting functions.<\/p>"},{"question":"How did ICMP originate, and who created it?","answer":"<p>ICMP was designed in the early 1980s as part of the original TCP\/IP specification. Its concepts were outlined by Dave Mills while working on TCP and IP.<\/p>"},{"question":"What is the role of ICMP in network communication?","answer":"<p>ICMP plays a crucial role in reporting errors, performing diagnostic functions, and providing feedback about network conditions. It operates at the network layer (Layer 3) of the OSI model.<\/p>"},{"question":"How does ICMP work internally?","answer":"<p>ICMP messages are encapsulated within IP packets, using IP services for delivery. When a router or host encounters an issue with an IP packet, it generates an ICMP message to inform the source device about the problem.<\/p>"},{"question":"What are some key features of ICMP?","answer":"<p>ICMP offers error reporting, diagnostic functions, network path verification, and flow control. It aids in troubleshooting and monitoring network performance.<\/p>"},{"question":"What are the different types of ICMP messages?","answer":"<p>ICMP encompasses various message types, such as Echo Request and Reply, Destination Unreachable, Redirect, Time Exceeded, and more.<\/p>"},{"question":"How is ICMP used, and what are the common problems associated with it?","answer":"<p>ICMP is widely used for ping testing, network troubleshooting, and path tracing. However, it can be targeted in malicious activities, such as ICMP flood attacks. Employing firewalls and intrusion prevention systems can help mitigate these issues.<\/p>"},{"question":"How does ICMP compare with other protocols like TCP and UDP?","answer":"<p>ICMP operates at Layer 3, while TCP and UDP operate at Layer 4. ICMP is connectionless and primarily used for diagnostics, whereas TCP provides reliable data transmission, and UDP offers low-latency data transmission.<\/p>"},{"question":"What is the future outlook for ICMP in networking technologies?","answer":"<p>As technology advances, ICMP is expected to remain essential in network diagnostics and troubleshooting. It may evolve to accommodate the requirements of emerging technologies like IoT and IPv6.<\/p>"},{"question":"How are proxy servers associated with ICMP?","answer":"<p>Proxy servers act as intermediaries in communication between clients and servers. While they primarily operate at the application layer, they can interact with ICMP messages to some extent, though such messages may not be directly visible to clients or servers.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477662","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\/477662\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477663"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}