\u00a0\u0110i\u1ec1u n\u00e0y \u0111\u00fang v\u1edbi c\u1ea3 \u0111\u1ecba ch\u1ec9 IP v\u00e0 \u0111\u1ecba ch\u1ec9 MAC.<\/span><\/p>\nC\u00e1c tr\u01b0\u1eddng h\u1ee3p kh\u00e1c nhau v\u1ec1 thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 IP c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t vi\u1ec7c g\u1eedi ARP mi\u1ec5n ph\u00ed. M\u1ed9t t\u00ecnh hu\u1ed1ng ph\u1ed5 bi\u1ebfn l\u00e0 khi\u00a0m\u00e1y ch\u1ee7 DHCP\u00a0cung c\u1ea5p \u0111\u1ecba ch\u1ec9 IP m\u1edbi cho m\u1ed9t giao di\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a thi\u1ebft b\u1ecb. N\u00f3 c\u0169ng c\u00f3 th\u1ec3 x\u1ea3y ra khi qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng thay \u0111\u1ed5i th\u1ee7 c\u00f4ng \u0111\u1ecba ch\u1ec9 IP ho\u1eb7c th\u00eam \u0111\u1ecba ch\u1ec9 m\u1edbi v\u00e0o giao di\u1ec7n.<\/p>\n
\u0110\u1ecba ch\u1ec9 MAC c\u1ee7a giao di\u1ec7n m\u1ea1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i \u1edf c\u1ea5p h\u1ec7 th\u1ed1ng. V\u00ed d\u1ee5, qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng c\u00f3 th\u1ec3 thay th\u1ebf giao di\u1ec7n m\u1ea1ng v\u1eadt l\u00fd \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 tr\u00ean h\u1ec7 th\u1ed1ng l\u00e0 eth0 b\u1eb1ng m\u1ed9t giao di\u1ec7n kh\u00e1c. Do \u0111\u00f3, \u0111\u1ecba ch\u1ec9 IP \u0111\u01b0\u1ee3c g\u00e1n cho eth0 sau \u0111\u00f3 s\u1ebd \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi MAC c\u1ee7a giao di\u1ec7n m\u1ea1ng v\u1eadt l\u00fd m\u1edbi.<\/p>\n
Trong c\u1ea3 hai tr\u01b0\u1eddng h\u1ee3p, ARP mi\u1ec5n ph\u00ed \u0111\u1ec1u r\u1ea5t h\u1eefu \u00edch. V\u00ed d\u1ee5, m\u1ed9t thi\u1ebft b\u1ecb c\u00f3 th\u1ec3\u00a0ph\u00e1t\u00a0ARP mi\u1ec5n ph\u00ed \u0111\u1ec3 c\u1eadp nh\u1eadt \u0111\u1ecba ch\u1ec9 m\u1edbi c\u1ee7a m\u00ecnh trong b\u1ea3n \u0111\u1ed3 c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c. Ngo\u00e0i ra, lo\u1ea1i th\u00f4ng b\u00e1o n\u00e0y cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c b\u00e1o c\u00e1o c\u00e1c xung \u0111\u1ed9t c\u00f3 th\u1ec3 x\u1ea3y ra v\u1edbi \u0111\u1ecba ch\u1ec9 IP m\u1edbi.<\/p>\n
4.2. Khi li\u00ean k\u1ebft c\u1ee7a m\u1ed9t giao di\u1ec7n thay \u0111\u1ed5i th\u00e0nh Upstate<\/h4>\n
Th\u00f4ng th\u01b0\u1eddng, h\u1ec7 th\u1ed1ng s\u1ebd ph\u00e1t h\u00e0nh ARP mi\u1ec5n ph\u00ed m\u1ed7i khi n\u00f3 \u0111\u01b0a li\u00ean k\u1ebft giao di\u1ec7n \u0111\u1ebfn m\u1ed9t upstate.<\/strong>\u00a0Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, th\u00f4ng b\u00e1o ARP mi\u1ec5n ph\u00ed \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1eadp nh\u1eadt b\u1ea3ng ARP tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c v\u1edbi kh\u1ea3 n\u0103ng \u00e1nh x\u1ea1 m\u1edbi gi\u1eefa \u0111\u1ecba ch\u1ec9 MAC v\u00e0 IP.<\/p>\nTr\u1ea1ng th\u00e1i li\u00ean k\u1ebft thay \u0111\u1ed5i t\u1eeb xu\u1ed1ng l\u00ean c\u0169ng c\u00f3 th\u1ec3 bi\u1ec3u th\u1ecb s\u1ef1 thay \u0111\u1ed5i c\u1ed5ng tr\u00ean switch. Do \u0111\u00f3, trong t\u00ecnh hu\u1ed1ng nh\u01b0 v\u1eady, ARP mi\u1ec5n ph\u00ed cho ph\u00e9p switch h\u1ecdc l\u1ea1i c\u1ed5ng n\u00e0o m\u00e0 m\u1ed9t \u0111\u1ecba ch\u1ec9 MAC nh\u1ea5t \u0111\u1ecbnh n\u1eb1m \u1edf \u0111\u00f3.<\/p>\n
4.3. Khi Qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng g\u1eedi n\u00f3<\/h4>\n
ARP mi\u1ec5n ph\u00ed c\u0169ng c\u00f3 th\u1ec3 c\u00f3 gi\u00e1 tr\u1ecb trong c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00f4ng \u0111\u01b0\u1ee3c h\u1ec7 \u0111i\u1ec1u h\u00e0nh t\u1ef1 \u0111\u1ed9ng x\u1eed l\u00fd.\u00a0Do \u0111\u00f3, qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng c\u00f3 th\u1ec3 ph\u00e1t h\u00e0nh th\u1ee7 c\u00f4ng c\u00e1c th\u00f4ng b\u00e1o ARP mi\u1ec5n ph\u00ed theo nhu c\u1ea7u c\u1ee7a h\u1ecd.<\/strong><\/p>\nC\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y theo nhi\u1ec1u c\u00e1ch. M\u1ed9t trong nh\u1eefng c\u00e1ch \u0111\u01a1n gi\u1ea3n nh\u1ea5t l\u00e0 th\u00f4ng qua c\u00e1c c\u00f4ng c\u1ee5 nh\u01b0\u00a0<\/span>arping<\/span>\u00a0, cung c\u1ea5p ch\u1ee9c n\u0103ng n\u00e0y th\u00f4ng qua giao di\u1ec7n d\u00f2ng l\u1ec7nh.<\/span><\/p>\n5. K\u1ebft lu\u1eadn<\/h3>\n
Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i \u0111\u00e3 nghi\u00ean c\u1ee9u kh\u00e1i ni\u1ec7m ARP mi\u1ec5n ph\u00ed v\u00e0 hi\u1ec3u m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee7a n\u00f3.\u00a0Ch\u00fang ta c\u00f3 th\u1ec3 k\u1ebft lu\u1eadn r\u1eb1ng ARP mi\u1ec5n ph\u00ed l\u00e0 th\u00f4ng b\u00e1o r\u1eb1ng ng\u01b0\u1eddi g\u1eedi ph\u00e1t b\u1ea3ng ARP c\u1ee7a ri\u00eang m\u00ecnh. Lo\u1ea1i th\u00f4ng b\u00e1o n\u00e0y h\u1eefu \u00edch trong nhi\u1ec1u t\u00ecnh hu\u1ed1ng v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u1ec3 chia s\u1ebb r\u00e0ng bu\u1ed9c IP\/MAC tr\u00ean m\u1ea1ng.<\/strong><\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":8438,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[234],"tags":[314,315],"class_list":["post-8435","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-tin-cong-nghe","tag-arp","tag-gratuitous-arp","post_format-post-format-aside"],"_links":{"self":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/posts\/8435","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8435"}],"version-history":[{"count":0,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/posts\/8435\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=\/wp\/v2\/media\/8438"}],"wp:attachment":[{"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pronetsolutionsvn.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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