{"id":900,"date":"2012-01-14T12:58:55","date_gmt":"2012-01-14T12:58:55","guid":{"rendered":"http:\/\/congnghepc.com\/2012\/01\/14\/huong-dan-doi-dns-server\/"},"modified":"2012-01-14T12:58:55","modified_gmt":"2012-01-14T12:58:55","slug":"huong-dan-doi-dns-server","status":"publish","type":"post","link":"https:\/\/tapchicntt.com\/huong-dan-doi-dns-server\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn \u0111\u1ed5i DNS Server"},"content":{"rendered":"<p style=\"text-align: center;\">\n\t<img decoding=\"async\" alt=\"\u0110\u1ed5i DNS Server\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer2.jpg\" style=\"width: 405px; height: 457px;\" \/><\/p>\n<h2 style=\"text-align: justify;\">\n\t1. T\u1ea1i sao n&ecirc;n \u0111\u1ed5i DNS Server?<\/h2>\n<h3 style=\"text-align: justify;\">\n\t\u0110\u1ec3 t\u0103ng t\u1ed1c th\u1ef1c hi\u1ec7n<\/h3>\n<p style=\"text-align: justify;\">\n\tB\u1ea5t k&igrave; trang web n&agrave;o c\u0169ng \u0111\u1ec1u y&ecirc;u c\u1ea7u \u0111\u1ecba ch\u1ec9 IP tr\u01b0\u1edbc khi n&oacute; c&oacute; th\u1ec3 t\u1ea3i. Thay \u0111\u1ed5i t&ecirc;n DNS s\u1ebd gi&uacute;p t\u1ea3i trang web nhanh h\u01a1n m\u1ed9t v&agrave;i gi&acirc;y. DNS Server c&agrave;ng nhanh, c&aacute;c trang web c\u0169ng \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i v&agrave; c&oacute; t\u1ed1c \u0111\u1ed9 t\u1ea3i nhanh h\u01a1n.<\/p>\n<p style=\"text-align: justify;\">\n\tC\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a DNS Server c&agrave;ng l\u1edbn, kh\u1ea3 n\u0103ng t&ecirc;n c\u1ee7a n&oacute; d\u1ec5 d&agrave;ng t&igrave;m th\u1ea5y m&agrave; kh&ocirc;ng c\u1ea7n t&igrave;m ki\u1ebfm tr&ecirc;n DNS Server kh&aacute;c c&agrave;ng cao. Nh\u1eefng c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111&atilde; \u0111\u01b0\u1ee3c cache c&oacute; th\u1eddi gian t\u1ea3i nhanh h\u01a1n nhi\u1ec1u so v\u1edbi nh\u1eefng c\u01a1 s\u1edf ch\u01b0a \u0111\u01b0\u1ee3c cache. V\u1ec1 c\u01a1 b\u1ea3n, 1\/10 c\u1ee7a t&ecirc;n <strong>0.1 second.cached<\/strong> s\u1ebd m\u1ea5t th\u1eddi gian 1 gi&acirc;y \u0111\u1ec3 t\u1ea3i n\u1ebfu n&oacute; kh&ocirc;ng \u0111\u01b0\u1ee3c t&igrave;m th\u1ea5y trong c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a DNS Server.<\/p>\n<h3 style=\"text-align: justify;\">\n\t\u0110\u1ec3 t\u0103ng \u0111\u1ed9 \u0111&aacute;ng tin c\u1eady<\/h3>\n<p style=\"text-align: justify;\">\n\tH\u1ea7u h\u1ebft DNS Server \u0111\u1ec1u c&oacute; \u0111\u1ed9 tin c\u1eady 100%. N\u1ebfu DNS Server c\u1ee7a b\u1ea1n kh&ocirc;ng \u0111\u01b0\u1ee3c nh\u01b0 v\u1eady, h&atilde;y t&igrave;m m\u1ed9t server \u0111&aacute;ng tin c\u1eady h\u01a1n. Truy v\u1ea5n DNS c&oacute; th\u1ec3 b\u1ecb timeout ho\u1eb7c, trong tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t, s\u1ebd kh&ocirc;ng nh\u1eadn \u0111\u01b0\u1ee3c response n&agrave;o c\u1ea3. C&oacute; m\u1ed9t v&agrave;i c&aacute;ch \u0111\u1ec3 nh\u1eefng v\u1ea5n \u0111\u1ec1 nh\u01b0 v\u1eady b\u1edbt x\u1ea3y ra h\u01a1n:<\/p>\n<ul>\n<li style=\"text-align: justify;\">\n\t\tDNS Server primary c\u1ee7a b\u1ea1n s\u1ebd ph\u1ea3i l&agrave; DND Server nhanh nh\u1ea5t<\/li>\n<li style=\"text-align: justify;\">\n\t\tX&aacute;c \u0111\u1ecbnh s\u1eed d\u1ee5ng nhi\u1ec1u DNS Server &ndash; &iacute;t nh\u1ea5t l&agrave; t\u1eeb 2 tr\u1edf l&ecirc;n &ndash; \u0111\u1ec3 gi\u1ea3m thi\u1ec3u nguy c\u01a1 m\u1ed9t ho\u1eb7c nhi\u1ec1u DNS Server g\u1eb7p l\u1ed7i.<\/li>\n<li style=\"text-align: justify;\">\n\t\tS\u1eed d\u1ee5ng DNS Server \u1edf nh\u1eefng t\u1ec9nh th&agrave;nh kh&aacute;c nhau, v&iacute; nh\u01b0 \u1edf H&agrave; N\u1ed9i v&agrave; th&agrave;nh ph\u1ed1 H\u1ed3 Ch&iacute; Minh, \u0111\u1ec3 nh\u1eefng v\u1ea5n \u0111\u1ec1 v\u1ec1 th\u1eddi ti\u1ebft hay nguy&ecirc;n nh&acirc;n kh&aacute;ch quan kh&aacute;c s\u1ebd \u1ea3nh h\u01b0\u1edfng t\u1edbi t\u1ea5t c\u1ea3 c&aacute;c DNS Server.<\/li>\n<li style=\"text-align: justify;\">\n\t\tC&oacute; &iacute;t nh\u1ea5t m\u1ed9t DNS Server g\u1ea7n v\u1edbi \u0111\u1ecba \u0111i\u1ec3m hi\u1ec7n t\u1ea1i c\u1ee7a b\u1ea1n, c&oacute; th\u1ec3 l&agrave; DNS Server \u1edf nh&agrave; cung c\u1ea5p d\u1ecbch v\u1ee5 (Internet Service Provider &#8211; ISP).<\/li>\n<li style=\"text-align: justify;\">\n\t\tN\u1ebfu nh&agrave; cung c\u1ea5p d\u1ecbch v\u1ee5 c&oacute; quy m&ocirc; nh\u1ecf, h&atilde;y t&igrave;m ki\u1ebfm m\u1ed9t DNS Server c&oacute; c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u1edbn h\u01a1n.<\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\">\n\t\u0110\u1ec3 c&oacute; \u0111\u1ed9 b\u1ea3o m\u1eadt cao h\u01a1n:<\/h3>\n<p style=\"text-align: justify;\">\n\tT\u1ea5t c\u1ea3 c&aacute;c DNS Server \u0111\u1ec1u kh&ocirc;ng c&oacute; chung t&iacute;nh n\u0103ng hay kh\u1ea3 n\u0103ng d\u1ec5 b\u1ecb t\u1ea5n c&ocirc;ng gi\u1ed1ng nhau. R\u1ea5t nhi\u1ec1u DNS Server kh&ocirc;ng ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c&aacute;ch s\u1eed d\u1ee5ng nh\u1eefng t&iacute;nh n\u0103ng b\u1ea3o m\u1eadt \u0111&atilde; \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp s\u1eb5n nh\u01b0 DNSSEC.<\/p>\n<p style=\"text-align: justify;\">\n\tM\u1ed9t s\u1ed1 DNS Server cung c\u1ea5p th&ecirc;m nh\u1eefng t&iacute;nh n\u0103ng nh\u01b0 l\u1ecdc \u0111\u1ecba ch\u1ec9 web \u0111\u1ec3 c\u1ea3i thi\u1ec7n b\u1ea3o m\u1eadt. Tuy nhi&ecirc;n, nh\u1eefng gi\u1ea3i ph&aacute;p n&agrave;y l\u1ea1i g&acirc;y ra m\u1ed9t v&agrave;i v\u1ea5n \u0111\u1ec1 kh&aacute;c:<\/p>\n<ul>\n<li style=\"text-align: justify;\">\n\t\tKh\u1ea3 n\u0103ng ch\u1ed1ng malware \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi Norton DNS v&agrave; nh\u1eefng h&atilde;ng kh&aacute;c<\/li>\n<li style=\"text-align: justify;\">\n\t\tKh\u1ea3 n\u0103ng ch\u1ed1ng phishing \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi OpenDNS v&agrave; nh\u1eefng h&atilde;ng kh&aacute;c<\/li>\n<li style=\"text-align: justify;\">\n\t\tDanh m\u1ee5c l\u1ecdc \u0111\u1ec3 c&aacute;c b\u1eadc cha m\u1eb9 qu\u1ea3n l&yacute; \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi OpenDNS v&agrave; c&aacute;c h&atilde;ng kh&aacute;c.<\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\">\n\t2. H\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c c\u1ea5u h&igrave;nh nh\u01b0 th\u1ebf n&agrave;o cho DNS<\/h2>\n<h3 style=\"text-align: justify;\">\n\tC\u1ea5u h&igrave;nh<\/h3>\n<p style=\"text-align: justify;\">\n\t<strong>T\u1ef1 \u0111\u1ed9ng c\u1ea5u h&igrave;nh t\u1eeb ISP?<\/strong><\/p>\n<p style=\"text-align: justify;\">\n\tNg\u01b0\u1eddi d&ugrave;ng th\u01b0\u1eddng x&aacute;c \u0111\u1ecbnh DNS Server khi c\u1ea5u h&igrave;nh k\u1ebft n\u1ed1i m\u1ea1ng Internet cho d&ugrave; b\u1ea1n s\u1eed d\u1ee5ng m\u1ea1ng dial-up ho\u1eb7c b\u0103ng th&ocirc;ng r\u1ed9ng. H\u1ea7u h\u1ebft c&aacute;c nh&agrave; cung c\u1ea5p d\u1ecbch v\u1ee5 (Internet Service Providers &ndash; ISPs) c&oacute; c\u1ea5u h&igrave;nh t\u1ef1 \u0111\u1ed9ng \u0111\u1ec3 DNS Server c&oacute; th\u1ec3 t\u1ef1 \u0111\u1ed9ng x&aacute;c \u0111\u1ecbnh. N\u1ebfu ph\u1ea3i c\u1ea5u h&igrave;nh th\u1ee7 c&ocirc;ng k\u1ebft n\u1ed1i m\u1ea1ng th&igrave; b\u1ea1n c\u0169ng ph\u1ea3i c\u1ea5u h&igrave;nh th\u1ee7 c&ocirc;ng DNS Server.<\/p>\n<p style=\"text-align: justify;\">\n\t<strong>C\u1ea5u h&igrave;nh tr&ecirc;n h\u1ec7 th\u1ed1ng<\/strong><\/p>\n<p style=\"text-align: justify;\">\n\tC&agrave;i \u0111\u1eb7t DNS Server s\u1ebd t\u1ed3n t\u1ea1i tr&ecirc;n t\u1eebng m&aacute;y t&iacute;nh c&oacute; s\u1eed d\u1ee5ng tr&ecirc;n Internet cho d&ugrave; ch&uacute;ng \u0111\u01b0\u1ee3c c\u1ea5u h&igrave;nh t\u1ef1 \u0111\u1ed9ng hay th\u1ee7 c&ocirc;ng. \u0110i\u1ec1u quan tr\u1ecdng n\u1eb1m \u1edf ch\u1ed7 External DNS Server \u0111\u01b0\u1ee3c x&aacute;c \u0111\u1ecbnh \u1edf \u0111&acirc;u?<\/p>\n<p style=\"text-align: justify;\">\n\t<strong>&#8211; \u1ede m&aacute;y t&iacute;nh?<\/strong> N\u1ebfu n&oacute; \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp t\u1edbi modem \u0111\u1ec3 truy c\u1eadp Internet th&igrave; n&oacute; s\u1ebd h\u1ec7 th\u1ed1ng DNS&nbsp;server.<\/p>\n<p style=\"text-align: justify;\">\n\t<strong>&#8211; \u1ede router?<\/strong> N\u1ebfu b\u1ea1n c&oacute; m\u1ea1ng local area network (LAN) th&igrave; router c&oacute; l\u1ebd l&agrave; n\u01a1i t\u1ed1t nh\u1ea5t \u0111\u1ec3 x&aacute;c \u0111\u1ecbnh DNS Server. B\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n&agrave;o k\u1ebft n\u1ed1i t\u1edbi router \u0111&oacute; c&oacute; th\u1ec3 t\u1ef1 \u0111\u1ed9ng c\u1eadp nh\u1eadt b\u1eb1ng c&aacute;ch s\u1eed d\u1ee5ng <strong>Dynamic Host Configuration Protocol<\/strong> (DHCP). \u0110i\u1ec1u n&agrave;y c&oacute; ngh\u0129a l&agrave; \u0111\u1ed5i External DNS Server \u1edf router s\u1ebd \u1ea3nh h\u01b0\u1edfng t\u1edbi t\u1ea5t c\u1ea3 c&aacute;c thi\u1ebft b\u1ecb k\u1ebft n\u1ed1i t\u1edbi n&oacute; b\u1eb1ng DHCP.<\/p>\n<p style=\"text-align: justify;\">\n\tV\u1ea5n \u0111\u1ec1 trong tr\u01b0\u1eddng h\u1ee3p n&agrave;y n\u1eb1m \u1edf ch\u1ed7 router r\u1ebb ti\u1ec1n c&oacute; th\u1ec3 g&acirc;y v\u1ea5n \u0111\u1ec1. V&iacute; d\u1ee5, b\u1ea1n g\u1eb7p v\u1ea5n \u0111\u1ec1 v\u1edbi router c\u1ee7a m&igrave;nh. V\u1ea5n \u0111\u1ec1 s\u1ebd nhi\u1ec1u h\u01a1n khi router \u0111\u01b0\u1ee3c c\u1ea5u h&igrave;nh l&agrave;m DNS Server v\u1edbi \u0111\u1ecba ch\u1ec9 IP 192.168.2.1 (\u0111\u1ecba ch\u1ec9 d&agrave;nh ri&ecirc;ng cho m\u1ea1ng n\u1ed9i b\u1ed9) n\u1ebfu b\u1ea1n x&aacute;c \u0111\u1ecbnh DNS Server m\u1ed9t c&aacute;ch th\u1ee7 c&ocirc;ng \u1edf t\u1eebng m&aacute;y m\u1ed9t.<\/p>\n<h3>\n\tT&igrave;m ki\u1ebfm h\u1ec7 th\u1ed1ng DNS Server b\u1eb1ng c&aacute;ch n&agrave;o<\/h3>\n<p style=\"text-align: justify;\">\n\tC&oacute; m\u1ed9t v&agrave;i ph\u01b0\u01a1ng ph&aacute;p \u0111\u1ec3 t&igrave;m h\u1ec7 th\u1ed1ng DNS Server. N\u1ebfu b\u1ea1n mu\u1ed1n bi\u1ebft r&otilde; th&ecirc;m, h&atilde;y \u0111\u1ecdc k\u1ef9 ph\u1ea7n sau &ldquo;\u0111\u1ed5i c\u1ea5u h&igrave;nh DNS&rdquo; \u0111\u1ec3 c&oacute; th&ecirc;m ngu\u1ed3n.<\/p>\n<p style=\"text-align: justify;\">\n\ta. Ch&uacute;ng t&ocirc;i khuy\u1ebfn c&aacute;o ng\u01b0\u1eddi d&ugrave;ng s\u1eed d\u1ee5ng ngu\u1ed3n t\u1ed1t \u0111\u1ec3 thay \u0111\u1ed5i c\u1ea5u h&igrave;nh DNS \u1edf m\u1ee5c k\u1ebf ti\u1ebfp. Ngu\u1ed3n t\u1ed1t nh\u1ea5t bao g\u1ed3m h\u1ea7u h\u1ebft c&aacute;c h\u1ec7 \u0111i\u1ec1u h&agrave;nh v&agrave; r\u1ea5t nhi\u1ec1u router.<\/p>\n<p style=\"text-align: justify;\">\n\tb. Trong c&agrave;i \u0111\u1eb7t c\u1ea5u h&igrave;nh m\u1ea1ng, v&agrave;o m\u1ee5c t&ugrave;y ch\u1ec9nh c\u1ee7a c\u1ea5u h&igrave;nh m\u1ea1ng , ch\u1ecdn card m\u1ea1ng n\u1ebfu c&oacute; nhi\u1ec1u h\u01a1n m\u1ed9t v&agrave; sau \u0111&oacute; ch\u1ecdn t&ugrave;y ch\u1ec9nh giao th\u1ee9c TCP\/IP, bao g\u1ed3m DNS Server.<\/p>\n<p style=\"text-align: justify;\">\n\tc. Ph\u1ea7n m\u1ec1m <a href=\"http:\/\/download.com.vn\/internet+email+tools\/internet+tools\/18598_namebench.aspx\" target=\"_blank\">NameBench <\/a>s\u1ebd n&oacute;i cho b\u1ea1n bi\u1ebft DNS Server c\u1ee7a m&igrave;nh l&agrave; g&igrave;.<\/p>\n<p style=\"text-align: justify;\">\n\td. L\u1ec7nh Windows: <strong>ipconfig \/all<\/strong> s\u1ebd hi\u1ec3n th\u1ecb c\u1ea5u h&igrave;nh IP c\u1ee7a h\u1ec7 th\u1ed1ng, bao g\u1ed3m c\u1ea3 DNS Server.<\/p>\n<p style=\"text-align: justify;\">\n\t<strong>V&iacute; d\u1ee5 c\u1ee7a ph\u01b0\u01a1ng ph&aacute;p 2 &ndash; Ki\u1ec3m tra c&agrave;i \u0111\u1eb7t k\u1ebft n\u1ed1i m\u1ea1ng trong Windows<\/strong><\/p>\n<p style=\"text-align: justify;\">\n\tCh&uacute; &yacute; r\u1eb1ng b\u1ea1n c&oacute; th\u1ec3 tho&aacute;t b\u1eb1ng c&aacute;ch nh\u1ea5n ph&iacute;m <strong>Esc<\/strong>, ch\u1ecdn <strong>Cancel <\/strong>ho\u1eb7c \u0111&oacute;ng c\u1eeda s\u1ed5.<\/p>\n<p style=\"text-align: justify;\">\n\tT&igrave;m icon k\u1ebft n\u1ed1i m\u1ea1ng trong khay h\u1ec7 th\u1ed1ng \u1edf ph&iacute;a cu\u1ed1i b&ecirc;n ph\u1ea3i m&agrave;n h&igrave;nh. Ph\u1ea3i chu\u1ed9t v&agrave;o icon k\u1ebft n\u1ed1i m\u1ea1ng v\u1edbi chu\u1ed9t c\u1ee7a m&igrave;nh \u0111\u1ec3 hi\u1ec3n th\u1ecb menu <strong>context<\/strong>. Ti\u1ebfp \u0111\u1ebfn, ch\u1ecdn menu <strong>Status<\/strong>.<\/p>\n<p style=\"text-align: center;\">\n\t&nbsp;<img decoding=\"async\" alt=\"\u0110\u1ed5i DNS Server\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer3.jpg\" style=\"width: 373px; height: 140px;\" \/><\/p>\n<p style=\"text-align: justify;\">\n\tH\u1ed9p tho\u1ea1i <strong>Local Area Connection Status<\/strong> s\u1ebd hi\u1ec3n th\u1ecb sau \u0111&oacute;. Ch\u1ecdn n&uacute;t <strong>Properties<\/strong>.<\/p>\n<p style=\"text-align: center;\">\n\t&nbsp;<img decoding=\"async\" alt=\"\u0110\u1ed5i DNS Server 2\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer4.jpg\" style=\"width: 367px; height: 446px;\" \/><\/p>\n<p style=\"text-align: justify;\">\n\tH\u1ed9p tho\u1ea1i <strong>Local Area Connection Properties<\/strong> s\u1ebd hi\u1ec3n th\u1ecb. Ch\u1ecdn <strong>Internet Protocol TCP\/IP<\/strong>.<\/p>\n<p style=\"text-align: center;\">\n\t&nbsp;<img decoding=\"async\" alt=\"\u0110\u1ed5i DNS Server 3\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer5.jpg\" style=\"width: 365px; height: 444px;\" \/><\/p>\n<p style=\"text-align: justify;\">\n\tH\u1ed9p tho\u1ea1i <strong>Internet Protocol (TCP\/IP) Properties<\/strong> s\u1ebd hi\u1ec3n th\u1ecb. C\u1ea5u h&igrave;nh DNS b\u1ecb \u1ea9n \u1edf ph&iacute;a cu\u1ed1i. Trong v&iacute; d\u1ee5 n&agrave;y, DNS Server \u0111&atilde; \u0111\u01b0\u1ee3c x&aacute;c \u0111\u1ecbnh th\u1ee7 c&ocirc;ng nh\u01b0ng ch&uacute;ng c&oacute; th\u1ec3 kh&ocirc;ng hi\u1ec3n th\u1ecb n\u1ebfu n&uacute;t <strong>Obtain DNS&nbsp;server address automatically<\/strong> \u0111\u01b0\u1ee3c t&iacute;ch. N\u1ebfu DNS Server c&oacute; hi\u1ec3n th\u1ecb, ch\u1ecdn n&uacute;t <strong>Advanced <\/strong>\u0111\u1ec3 xem c&agrave;i \u0111\u1eb7t <strong>Advanced TCP\/IP&nbsp;Settings<\/strong>, n\u01a1i ch&uacute;ng ta c&oacute; th\u1ec3 bi\u1ebft li\u1ec7u c&oacute; 2 DNS Server \u0111\u01b0\u1ee3c c\u1ea5u h&igrave;nh hay kh&ocirc;ng.<\/p>\n<p style=\"text-align: center;\">\n\t&nbsp;<img decoding=\"async\" alt=\"\u0110\u1ed5i DNS Server 4\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer6.jpg\" style=\"width: 403px; height: 450px;\" \/><\/p>\n<p style=\"text-align: justify;\">\n\tH\u1ed9p tho\u1ea1i Advanced TCP\/IP Settings hi\u1ec3n th\u1ecb. Th\u1ebb <strong>IP&nbsp;Settings<\/strong> s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u01b0\u1edbc ti&ecirc;n. Ti\u1ebfp \u0111\u1ebfn, ch\u1ecdn th\u1ebb <strong>DNS <\/strong>\u0111\u1ec3 hi\u1ec3n th\u1ecb \u0111\u1ecba ch\u1ec9 c\u1ee7a <strong>DNS Server<\/strong>. Trong v&iacute; d\u1ee5, ch\u1ec9 c&oacute; 2 DNS Server. Ch&uacute;ng t&ocirc;i c\u0169ng ch\u1ecdn n&uacute;t <strong>Add <\/strong>\u0111\u1ec3 m\u1edf h\u1ed9p tho\u1ea1i TCP\/IP&nbsp;DNS&nbsp;Server trong \u0111&oacute; ch&uacute;ng t&ocirc;i \u0111&atilde; \u0111i\u1ec1n \u0111\u1ecba ch\u1ec9 IP DNS Server l&agrave; 8.8.4.4. Th\u1ee9 t\u1ef1 ph&acirc;n lo\u1ea1i c&oacute; th\u1ec3 thay \u0111\u1ed5i b\u1eb1ng c&aacute;ch d&ugrave;ng 2 m\u0169i t&ecirc;n \u1edf b&ecirc;n ph\u1ea3i.<\/p>\n<p style=\"text-align: center;\">\n\t&nbsp;<img decoding=\"async\" alt=\"\u0110\u1ed5i DNS Server 5\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer7.jpg\" style=\"width: 423px; height: 482px;\" \/><\/p>\n<h3>\n\tL&agrave;m th\u1ebf n&agrave;o \u0111\u1ec3 ki\u1ec3m tra xem c\u1ea5u h&igrave;nh DNS h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i<\/h3>\n<p style=\"text-align: justify;\">\n\tNg\u01b0\u1eddi d&ugrave;ng ho&agrave;n to&agrave;n c&oacute; th\u1ec3 c\u1ea5u h&igrave;nh sai b\u1eb1ng c&aacute;ch, v&iacute; d\u1ee5 l&agrave; \u0111i\u1ec1n \u0111\u1ecba ch\u1ec9 IP sai cho DNS Server. N\u1ebfu b\u1ea1n l&agrave;m nh\u01b0 v\u1eady, tr&igrave;nh duy\u1ec7t web kh&ocirc;ng th\u1ec3 truy c\u1eadp v&agrave;o Internet b\u1eb1ng c&aacute;ch s\u1eed d\u1ee5ng <strong>domain name<\/strong> nh\u01b0ng t\u1ed1t h\u01a1n n&ecirc;n s\u1eed d\u1ee5ng URL v\u1edbi \u0111\u1ecba ch\u1ec9 IP h\u1ee3p l\u1ec7. Ch\u1ec9 c\u1ea7n \u0111i\u1ec1n \u0111\u1ecba ch\u1ec9 IP h\u1ee3p l\u1ec7 gi\u1ed1ng nh\u01b0 \u0111\u1ecba ch\u1ec9 URL v&agrave; tr&igrave;nh duy\u1ec7t s\u1ebd th&ecirc;m ph\u1ea7n c&ograve;n l\u1ea1i, v&iacute; d\u1ee5 \u0111i\u1ec1n 72.52.134.16 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th&agrave;nh http:\/\/72.52.134.16\/.<\/p>\n<p style=\"text-align: justify;\">\n\tN\u1ebfu b\u1ea1n ph&aacute;t hi\u1ec7n ra m&igrave;nh kh&ocirc;ng th\u1ec3 truy c\u1eadp v&agrave;o web ngay c\u1ea3 khi s\u1eed d\u1ee5ng \u0111\u1ecba ch\u1ec9 IP th&igrave; c&oacute; v\u1ebb nh\u01b0 \u0111&acirc;y l&agrave; v\u1ea5n \u0111\u1ec1 c\u1ee7a DNS. K\u1ebft n\u1ed1i m\u1ea1ng c&oacute; th\u1ec3 b\u1ecb l\u1ed5i ho\u1eb7c malware \u0111&atilde; thay \u0111\u1ed5i c\u1ea5u h&igrave;nh c\u1ee7a b\u1ea1n ( v&iacute; d\u1ee5, c&agrave;i \u0111\u1eb7t k\u1ebft n\u1ed1i m\u1ea1ng \u0111\u1ec3 s\u1eed d\u1ee5ng proxy server).<\/p>\n<h2>\n\t3. \u0110\u1ed5i c\u1ea5u h&igrave;nh DNS<\/h2>\n<h3>\n\tTr\u01b0\u1edbc khi c\u1ea5u h&igrave;nh DNS Server<\/h3>\n<p style=\"text-align: justify;\">\n\tB\u1ea1n c&oacute; th\u1ec3 mu\u1ed1n ch\u1ea1y DNS&nbsp;Spoof Test \u0111\u1ec3 ki\u1ec3m tra kh\u1ea3 n\u0103ng t\u1ea5n c&ocirc;ng c\u1ee7a DNS Server. H&atilde;y c\u1ea9n th\u1eadn b\u1edfi m\u1ed9t s\u1ed1 router s\u1ebd b\u1ecb treo ho\u1eb7c g\u1eb7p l\u1ed5i n\u1ebfu b\u1ea1n ch\u1ea1y nh\u1eefng ki\u1ec3m tra n&agrave;y. GRC cung c\u1ea5p m\u1ed9t danh s&aacute;ch c&aacute;c router v\u1edbi nh\u1eefng v\u1ea5n \u0111\u1ec1 th\u01b0\u1eddng g\u1eb7p. N&oacute; kh&ocirc;ng bao g\u1ed3m router c\u1ee7a ch&uacute;ng t&ocirc;i v\u1edbi l\u1ed5i g\u1eb7p ph\u1ea3i khi ki\u1ec3m tra. D\u1eabu v\u1eady, v\u1eabn c&ograve;n m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 t\u01b0\u01a1ng t\u1ef1 \u0111\u01b0\u1ee3c li\u1ec7t k&ecirc;. \u0110&acirc;y l&agrave; m\u1ed9t l&yacute; do t\u1ed1t \u0111\u1ec3 nh\u1eadn router t\u1ed1t h\u01a1n. Xem ghi ch&uacute; c\u1ee7a GRC \u1edf ph&iacute;a cu\u1ed1i c\u1ee7a trang DNS&nbsp;Spoof Test \u0111\u1ec3 t&igrave;m danh s&aacute;ch c&aacute;c router b\u1ecb th\u1ea5t b\u1ea1i.<\/p>\n<h3>\n\tC&aacute;c ngu\u1ed3n c&oacute; th\u1ec3 gi&uacute;p \u0111\u1ed5i c\u1ea5u h&igrave;nh DNS<\/h3>\n<p style=\"text-align: justify;\">\n\tC&oacute; r\u1ea5t nhi\u1ec1u ph\u1ea7n m\u1ec1m tr&ecirc;n th\u1ecb tr\u01b0\u1eddng c&oacute; th\u1ec3 t\u1ef1 \u0111\u1ed9ng \u0111\u1ed5i DNS Server t\u1ed1t h\u01a1n nh\u01b0ng ch&uacute;ng t&ocirc;i s\u1ebd kh&ocirc;ng nh\u1eafc t\u1edbi ch&uacute;ng. Thay v&agrave;o \u0111&oacute;, ch&uacute;ng t&ocirc;i khuy\u1ebfn kh&iacute;ch ng\u01b0\u1eddi d&ugrave;ng truy c\u1eadp m\u1ed9t s\u1ed1 ngu\u1ed3n tuy\u1ec7t v\u1eddi c&oacute; th\u1ec3 gi&uacute;p &iacute;ch.<\/p>\n<h3>\n\tH\u01b0\u1edbng gi\u1ea3i quy\u1ebft<\/h3>\n<p style=\"text-align: justify;\">\n\tN\u1ebfu c\u1ea3m th\u1ea5y kh&ocirc;ng ch\u1eafc ch\u1eafn ch&uacute;t n&agrave;o, ng\u01b0\u1eddi d&ugrave;ng n&ecirc;n xem qua nh\u1eefng ngu\u1ed3n sau \u0111&acirc;y v\u1ec1 c&aacute;ch c\u1ea5u h&igrave;nh DNS Server. Ch\u1ec9 c\u1ea7n nh\u1edb r\u1eb1ng \u0111\u1ecba ch\u1ec9 IP c\u1ee7a DNS Server h\u1ecd cung c\u1ea5p cho b\u1ea1n trong h\u01b0\u1edbng d\u1eabn n&agrave;y l&agrave; d&agrave;nh cho server c\u1ee7a h\u1ecd. Ng\u01b0\u1eddi d&ugrave;ng c&oacute; th\u1ec3 thay th\u1ebf \u0111\u1ecba ch\u1ec9 IP cho DNS Server c\u1ee7a m&igrave;nh.<\/p>\n<ul>\n<li>\n\t\tOpenDNS c&oacute; h\u01b0\u1edbng d\u1eabn c&agrave;i \u0111\u1eb7t cho h\u1ea7u h\u1ebft c&aacute;c h\u1ec7 \u0111i\u1ec1u h&agrave;nh. C&oacute; 2 video h\u01b0\u1edbng d\u1eabn \u0111i k&egrave;m kh&aacute; ti\u1ec7n &iacute;ch \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 ng\u01b0\u1eddi d&ugrave;ng. DNS Benchmark \u0111&atilde; th\u1ea3o lu\u1eadn c&aacute;c v\u1ea5n \u0111\u1ec1 li&ecirc;n quan t\u1edbi c\u1ea5u h&igrave;nh DNS tr&ecirc;n router. Trang n&agrave;y c\u0169ng gi\u1edbi thi\u1ec7u h\u01b0\u1edbng d\u1eabn OpenDNS.<\/li>\n<li>\n\t\tGoogle c&oacute; h\u01b0\u1edbng d\u1eabn t\u1ed1t \u0111\u1ec3 thay \u0111\u1ed5i v&agrave; ki\u1ec3m tra c\u1ea5u h&igrave;nh m\u1edbi.<\/li>\n<li>\n\t\t\u0110\u01a1n gi\u1ea3n h\u01a1n, ng\u01b0\u1eddi d&ugrave;ng c&oacute; th\u1ec3 t&igrave;m th\u1ea5y h\u01b0\u1edbng d\u1eabn c&oacute; \u0111&ocirc;i ch&uacute;t thi\u1ebfu s&oacute;t \u1edf DNS&nbsp;Advantage (Comodo DNS). ClearCloud c&oacute; h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 chuy\u1ec3n b\u1edfi h&atilde;ng n&agrave;y kh&ocirc;ng c&ograve;n ti\u1ebfp t\u1ee5c d\u1ecbch v\u1ee5 DNS mi\u1ec5n ph&iacute; c\u1ee7a h\u1ecd n\u1eefa.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">\n\t<strong>Ph\u1ea7n m\u1ec1m c\u0169ng c&oacute; th\u1ec3 gi&uacute;p b\u1ea1n \u0111\u1ed5i c\u1ea5u h&igrave;nh nh\u01b0ng r\u1ea5t h\u1ea1n ch\u1ebf<\/strong><\/p>\n<p style=\"text-align: justify;\">\n\t<a href=\"http:\/\/download.com.vn\/timkiem\/?query=DNS+Jumper&amp;dir=all\" target=\"_blank\">DNS&nbsp;Jumper<\/a> s\u1ebd thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 DNS gi&uacute;p b\u1ea1n nh\u01b0ng l\u1ea1i c&oacute; m\u1ed9t s\u1ed1 \u0111i\u1ec3m y\u1ebfu:<\/p>\n<ul>\n<li>\n\t\tCh\u1ec9 c&oacute; 2 DNS Server \u0111\u1ea7u ti&ecirc;n c&oacute; th\u1ec3 thay \u0111\u1ed5i tr&ecirc;n h\u1ec7 th\u1ed1ng. N\u1ebfu mu\u1ed1n s\u1edf h\u1eefu h\u01a1n 2 DNS Server, b\u1ea1n s\u1ebd ph\u1ea3i t&igrave;m t\u1edbi m\u1ed9t gi\u1ea3i ph&aacute;p kh&aacute;c.<\/li>\n<li>\n\t\tTheo m\u1eb7c \u0111\u1ecbnh, n&oacute; ch\u1ec9 bao g\u1ed3m nh\u1eefng DNS Server c&ocirc;ng c\u1ed9ng trong c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a m&igrave;nh. Ng\u01b0\u1eddi d&ugrave;ng c\u0169ng c&oacute; th\u1ec3 th&ecirc;m nh\u1eefng DNS Server kh&aacute;c.<\/li>\n<li>\n\t\tDNS Jumper ch\u1ec9 c&oacute; th\u1ec3 thay \u0111\u1ed5i m\u1ed9t t\u1eadp h\u1ee3p c&aacute;c DNS Server, v&iacute; nh\u01b0 t\u1eeb Google ho\u1eb7c t\u1eeb OpenDNS. N\u1ebfu mu\u1ed1n tr\u1ed9n l\u1eabn nh&agrave; cung c\u1ea5p d\u1ecbch v\u1ee5, b\u1ea1n s\u1ebd ph\u1ea3i th&ecirc;m th&ecirc;m m\u1ed9t t\u1eadp h\u1ee3p m\u1edbi.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">\n\t<strong>DNS&nbsp;Helper<\/strong> (tr\u01b0\u1edbc kia l&agrave; Google DNS&nbsp;Helper) l&agrave; c&ocirc;ng c\u1ee5 \u0111\u1ed5i t\u1eeb nh&agrave; cung c\u1ea5p d\u1ecbch v\u1ee5 DNS m&agrave; ch&uacute;ng t&ocirc;i kh&ocirc;ng khuy\u1ebfn c&aacute;o:<\/p>\n<ul>\n<li>\n\t\tNg\u01b0\u1eddi d&ugrave;ng kh&ocirc;ng th\u1ec3 th&ecirc;m server c\u1ee7a ri&ecirc;ng m&igrave;nh ngo&agrave;i m\u1ed9t trong nh\u1eefng server DNS t&ugrave;y bi\u1ebfn<\/li>\n<li>\n\t\tN\u1ebfu b\u1ea1n thay \u0111\u1ed5i DNS Server trong m\u1ed9t Windows session, n&oacute; s\u1ebd kh&ocirc;ng c\u1eadp nh\u1eadt \u0111\u1ecba ch\u1ec9 IP c\u1ee7a DNS Server \u0111\u1ec3 ph\u1ee5c h\u1ed3i cho t\u1edbi khi b\u1ea1n b\u1eaft \u0111\u1ea7u m\u1ed9t session m\u1edbi.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">\n\tT\u01b0\u01a1ng t\u1ef1, c&ocirc;ng c\u1ee5 <strong>Public DNS Server Tool<\/strong> c\u0169ng b\u1ecb h\u1ea1n ch\u1ebf n&ecirc;n ch&uacute;ng t&ocirc;i kh&ocirc;ng khuy\u1ebfn c&aacute;o ng\u01b0\u1eddi d&ugrave;ng s\u1eed d\u1ee5ng.<\/p>\n<h3>\n\tSau khi thay \u0111\u1ed5i c\u1ea5u h&igrave;nh DNS<\/h3>\n<p style=\"text-align: justify;\">\n\t<strong>Flush cache h\u1ec7 th\u1ed1ng DNS<\/strong><\/p>\n<p style=\"text-align: justify;\">\n\tKhi thay \u0111\u1ed5i c\u1ea5u h&igrave;nh c\u1ee7a DNS, b\u1ea1n n&ecirc;n x&oacute;a cache h\u1ec7 th\u1ed1ng \u0111\u1ec3 c&agrave;i \u0111\u1eb7t DNS m\u1edbi s\u1ebd ngay l\u1eadp t\u1ee9c c&oacute; hi\u1ec7u l\u1ef1c. Ng\u01b0\u1eddi d&ugrave;ng n&ecirc;n s\u1eed d\u1ee5ng CCleaner, c&ocirc;ng c\u1ee5 \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi khuy\u1ebfn c&aacute;o s\u1eed d\u1ee5ng, \u0111\u1ec3 x&oacute;a cache b\u1edfi sau khi \u0111\u01b0\u1ee3c c&agrave;i n&oacute; s\u1ebd x&oacute;a cache c\u1ee7a t\u1eebng tr&igrave;nh tuy\u1ec7t m\u1ed9t. C&aacute;c l\u1ef1a ch\u1ecdn kh&aacute;c c\u0169ng c&oacute;, nh\u01b0ng ch&uacute;ng v\u1eabn g\u1eb7p h\u1ea1n ch\u1ebf.<\/p>\n<ul>\n<li>\n\t\t<strong>X&oacute;a cache h\u1ec7 th\u1ed1ng DNS<\/strong>: L\u1ec7nh ipconfig \/flushdns s\u1ebd x&oacute;a DNS resolver cache v&agrave; l&agrave;m m\u1edbi n&oacute; ch\u1ec9 v\u1edbi nh\u1eefng entry trong file Hosts. ipconfig \/flushdns s\u1ebd hi\u1ec3n th\u1ecb cache h\u1ec7 th\u1ed1ng DNS.<\/li>\n<li>\n\t\t<strong>X&oacute;a cache cho tr&igrave;nh duy\u1ec7t web<\/strong>: M\u1ed9t s\u1ed1 tr&igrave;nh duy\u1ec7t web cho ph&eacute;p ng\u01b0\u1eddi d&ugrave;ng th\u1ef1c hi\u1ec7n c&ocirc;ng vi\u1ec7c x&oacute;a cache ngay trong tr&igrave;nh duy\u1ec7t.<\/li>\n<\/ul>\n<p style=\"text-align: center;\">\n\t<img decoding=\"async\" alt=\"X\u00f3a DNS Server\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer8.jpg\" style=\"width: 405px; height: 457px;\" \/><\/p>\n<p>\n\t<i>(Theo Techsupportalert)<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\n\t<img decoding=\"async\" alt=\"\" src=\"http:\/\/dl.dropbox.com\/u\/1552467\/forum\/2012\/DNSsever\/DNSServer.jpg\" style=\"width: 100px; height: 80px; margin-left: 5px; margin-right: 5px; float: left;\" \/>DNS&nbsp;server l&agrave; th&agrave;nh ph\u1ea7n quan tr\u1ecdng \u0111\u1ec3 tr\u1ea3i nghi\u1ec7m web \u0111\u01b0\u1ee3c t\u1ed1t h\u01a1n, nh\u01b0ng r\u1ea5t &iacute;t ng\u01b0\u1eddi hi\u1ec3u \u0111\u01b0\u1ee3c c&aacute;ch th\u1ee9c l&agrave;m vi\u1ec7c c\u1ee7a ch&uacute;ng ho\u1eb7c kh\u1ea3 n\u0103ng b\u1ea3o m\u1eadt s\u1ebd g&acirc;y ra nh\u1eefng v\u1ea5n \u0111\u1ec1 g&igrave;. Ch&uacute;ng t&ocirc;i khuy\u1ebfn c&aacute;o ng\u01b0\u1eddi d&ugrave;ng n&ecirc;n \u0111\u1ecdc b&agrave;i vi\u1ebft n&agrave;y \u0111\u1ec3 c&oacute; th\u1ec3 thay \u0111\u1ed5i DNS Server c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<p>\n\t&nbsp;<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129],"tags":[],"class_list":["post-900","post","type-post","status-publish","format-standard","hentry","category-thu-thuat-mang-web"],"views":398,"_links":{"self":[{"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/posts\/900","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/comments?post=900"}],"version-history":[{"count":0,"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/posts\/900\/revisions"}],"wp:attachment":[{"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/media?parent=900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/categories?post=900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tapchicntt.com\/rest-api\/wp\/v2\/tags?post=900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}