{"id":33717,"date":"2019-10-31T21:54:20","date_gmt":"2019-10-31T18:54:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/delegirovanie-obratnoj-zony-podseti-menee-24-v-bind-kak-eto-rabotaet\/"},"modified":"2019-10-31T21:54:20","modified_gmt":"2019-10-31T18:54:20","slug":"delegirovanie-obratnoj-zony-podseti-menee-24-v-bind-kak-eto-rabotaet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/delegirovanie-obratnoj-zony-podseti-menee-24-v-bind-kak-eto-rabotaet","title":{"rendered":"A BIND visszavon\u00e1si z\u00f3n\u00e1j\u00e1nak deleg\u00e1l\u00e1sa \/24 alatti alh\u00e1l\u00f3zatok eset\u00e9n. Hogyan m\u0171k\u00f6dik ez?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Egy alkalommal azzal a feladattal n\u00e9ztem szembe, hogy egy \u00fcgyf\u00e9lnek \u00e1tadjam a jogot a PTR-rekordok szerkeszt\u00e9s\u00e9re a neki oda\u00edt\u00e9lt \/28-as alh\u00e1l\u00f3zatban. Nincs automatiz\u00e1l\u00e1som a BIND be\u00e1ll\u00edt\u00e1sainak k\u00fcls\u0151 szerkeszt\u00e9s\u00e9re, ez\u00e9rt egy m\u00e1sik megold\u00e1s mellett d\u00f6nt\u00f6ttem \u2014 deleg\u00e1lni az \u00fcgyf\u00e9lnek a \/24-es alh\u00e1l\u00f3zat PTR-z\u00f3n\u00e1j\u00e1nak egy r\u00e9sz\u00e9t.<\/p>\n<p>Azt gondoln\u00e1nk, hogy mi lehet enn\u00e9l egyszer\u0171bb? Csak be\u00edrjuk az alh\u00e1l\u00f3t a megfelel\u0151 m\u00f3don, \u00e9s az sz\u00fcks\u00e9ges NS-re ir\u00e1ny\u00edtunk, ahogyan azt a szubdomain eset\u00e9ben tessz\u00fck. De nem, nem olyan egyszer\u0171 (b\u00e1r val\u00f3j\u00e1ban el\u00e9g primit\u00edv, de az intu\u00edci\u00f3 nem seg\u00edt), ez\u00e9rt \u00edrom ezt a cikket.<\/p>\n<p>Aki szeretn\u00e9 mag\u00e1t\u00f3l meg\u00e9rteni, olvashatja. <noindex><a rel=\"nofollow\" href=\"ftp:\/\/ftp.ripe.net\/rfc\/rfc2317.txt\">RFC<\/a><\/noindex><br \/>\nAki k\u00e9sz megold\u00e1st szeretne, az \u00fcdv\u00f6z\u00f6lve van az al\u00e1bbiak alatt.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nAnnak \u00e9rdek\u00e9ben, hogy ne tartsam fel azokat, akik szeretik a m\u00e1sol\u00e1s-beilleszt\u00e9s m\u00f3dszert, el\u0151sz\u00f6r k\u00f6zz\u00e9teszem a praktikus r\u00e9szt, \u00e9s ut\u00e1na a elm\u00e9letit.<\/p>\n<p><b>1. Gyakorlat. Deleg\u00e1ljuk a \/28-as z\u00f3n\u00e1t.<\/b><\/p>\n<p>Tegy\u00fck fel, hogy van egy alh\u00e1l\u00f3zatunk. <b>7.8.9.0\/24<\/b>. Az alh\u00e1l\u00f3zatot kell deleg\u00e1lnunk <b>7.8.9.240\/28<\/b> a dns-\u00fcgyf\u00e9lnek <b>7.8.7.8<\/b> (<b>ns1.client.domain<\/b>).<\/p>\n<p>A szolg\u00e1ltat\u00f3 DNS-n\u00e9l meg kell keresni a f\u00e1jlt, ami az alh\u00e1l\u00f3zat ford\u00edtott z\u00f3n\u00e1j\u00e1t \u00edrja le. Legyen ez <b>9.8.7.in-addr.arpa<\/b>. <br \/>\nA 240 \u00e9s 255 k\u00f6z\u00f6tti rekordokat kommentelj\u00fck ki, ha vannak. A f\u00e1jl v\u00e9g\u00e9re az al\u00e1bbiakat \u00edrjuk:<\/p>\n<pre><code class=\"plaintext\">255-240  IN  NS      7.8.7.8\n$GENERATE 240-255 $ CNAME $.255-240<\/code><\/pre>\n<p>\nne feledkezz\u00fcnk meg a z\u00f3na sorozatsz\u00e1m\u00e1nak n\u00f6vel\u00e9s\u00e9r\u0151l, \u00e9s csin\u00e1ljuk <\/p>\n<pre><code class=\"plaintext\">rndc reload<\/code><\/pre>\n<p>\nEzzel a szolg\u00e1ltat\u00f3 r\u00e9sz v\u00e9get \u00e9rt. \u00c1tt\u00e9r\u00fcnk az \u00fcgyf\u00e9ldns-re.<\/p>\n<p>El\u0151sz\u00f6r l\u00e9tre kell hoznunk a f\u00e1jlt <b>\/etc\/bind\/master\/255-240.9.8.7.in-addr.arpa<\/b> a k\u00f6vetkez\u0151 tartalommal:<\/p>\n<pre><code class=\"plaintext\">$ORIGIN 255-240.9.8.7.in-addr.arpa.\n$TTL 1W\n@                       1D IN SOA       ns1.client.domain. root.client.domain. (\n                        2008152607      ; sorozatsz\u00e1m\n                        3H              ; friss\u00edt\u00e9s\n                        15M             ; \u00fajrapr\u00f3b\u00e1lkoz\u00e1s\n                        1W              ; lej\u00e1rati id\u0151\n                        1D )            ; minimum\n@                       IN NS        ns1.client.domain.\n@                       IN NS        ns2.client.domain.\n241                     IN PTR          test.client.domain.\n242                     IN PTR          test2.client.domain.\n245                     IN PTR          test5.client.domain.\n<\/code><\/pre>\n<p>\n\u00c9s a <b>named.conf<\/b> be kell \u00edrnunk a \u00faj f\u00e1jlunk le\u00edr\u00e1s\u00e1t:<\/p>\n<pre><code class=\"plaintext\">zone \"255-240.9.8.7.in-addr.arpa.\" IN {\n        type master;\n        file \"master\/255-240.9.8.7.in-addr.arpa\";\n};<\/code><\/pre>\n<p>\nA B \u00fajraind\u00edtja a bind folyamatot.<\/p>\n<pre><code class=\"plaintext\">\/etc\/init.d\/named restart<\/code><\/pre>\n<p>\nK\u00e9sz. Most m\u00e1r ellen\u0151rizhetj\u00fck.<\/p>\n<pre><code class=\"plaintext\">#&gt;  host 7.8.9.245 \n245.9.8.7.in-addr.arpa is an alias for 245.255-240.9.8.7.in-addr.arpa.\n245.255-240.9.8.7.in-addr.arpa domain name pointer test5.client.domain.<\/code><\/pre>\n<p>\nFigyeljen arra, hogy nemcsak a PTR-rekord, hanem a CNAME is visszaad\u00e1sra ker\u00fcl. \u00cdgy is kell lennie. Ha \u00e9rdekli, hogy mi\u00e9rt, akkor \u00fcdv\u00f6zlet a k\u00f6vetkez\u0151 fejezetben.<\/p>\n<p><b>2. Elm\u00e9let. Hogyan m\u0171k\u00f6dik ez.<\/b><\/p>\n<p>Neh\u00e9z be\u00e1ll\u00edtani \u00e9s hibakeresni egy fekete dobozt. Sokkal egyszer\u0171bb, ha tudjuk, mi t\u00f6rt\u00e9nik bel\u00fcl.<\/p>\n<p>Amikor deleg\u00e1ljuk a szubdomaint egy domaine bel\u00fcl <b>domain<\/b>, akkor valami ilyesmit \u00edrunk:<\/p>\n<pre><code class=\"plaintext\">client.domain.\tNS\tns1.client.domain.\nns1.client.domain.\tA\t7.8.7.8<\/code><\/pre>\n<p>\nMinden \u00e9rdekl\u0151d\u0151nek azt mondjuk, hogy ez\u00e9rt a r\u00e9szleg\u00e9rt nem vagyunk felel\u0151sek, \u00e9s megmondjuk, ki felel\u0151s. Az \u00f6sszes k\u00e9r\u00e9s a <b>client.domain<\/b> 7.8.7.8-ra ir\u00e1nyul. Ellen\u0151rz\u00e9skor a k\u00f6vetkez\u0151 k\u00e9pet l\u00e1tjuk (nehogy figyelmen k\u00edv\u00fcl hagyjuk, mi van az \u00fcgyf\u00e9ln\u00e9l, ez l\u00e9nyegtelen):<\/p>\n<pre><code class=\"plaintext\"># host test.client.domain\ntest.client.domain has address 7.8.9.241<\/code><\/pre>\n<p>\nTeh\u00e1t \u00e9rtes\u00edtett\u00e9k, hogy van egy A rekord, \u00e9s annak az IP c\u00edme 7.8.9.241. Semmi felesleges inform\u00e1ci\u00f3.<\/p>\n<p><b>De hogyan lehet ugyanezt megtenni egy alh\u00e1l\u00f3zattal?<\/b><\/p>\n<p>Mivel a DNS-szerver\u00fcnk a RIPE-ban van bejegyezve, ez\u00e9rt amikor a IP c\u00edm PTR lek\u00e9rdez\u00e9s\u00e9re ker\u00fcl sor a mi h\u00e1l\u00f3zatunkb\u00f3l, az els\u0151 k\u00e9r\u00e9s \u00fagyis hozz\u00e1nk \u00e9rkezik. A logika ugyanaz, mint a domainek eset\u00e9ben. Csak az a k\u00e9rd\u00e9s, hogyan kell be\u00edrni az alh\u00e1l\u00f3zatot a z\u00f3naf\u00e1jlba?<\/p>\n<p>Pr\u00f3b\u00e1ljuk meg \u00edgy be\u00edrni:<\/p>\n<pre><code class=\"plaintext\">255-240  IN  NS      7.8.7.8<\/code><\/pre>\n<p>\nNos, csoda nem t\u00f6rt\u00e9nt. Nem kapunk meg semmilyen k\u00e9r\u00e9s-\u00e1tir\u00e1ny\u00edt\u00e1st. Az eg\u00e9sz annyira egyszer\u0171, hogy a bind egy\u00e1ltal\u00e1n nincs tiszt\u00e1ban azzal, hogy ezek a rekordok a ford\u00edtott z\u00f3n\u00e1ban IP-c\u00edmek, \u00e9s m\u00e9g csak a tartom\u00e1nyrekordot sem \u00e9rti. Sz\u00e1m\u00e1ra ez csup\u00e1n egy szimbolikus aldomain. Teh\u00e1t a bind sz\u00e1m\u00e1ra nem lesz k\u00fcl\u00f6nbs\u00e9g a \"<b>255-240<\/b>&#187; \u00e9s az &#171;<b>oursuperclient<\/b>\". Ahhoz, hogy a k\u00e9r\u00e9s a megfelel\u0151 helyre ker\u00fclj\u00f6n, a k\u00e9r\u00e9sben szerepl\u0151 c\u00edmnek \u00edgy kell kin\u00e9znie: <b>241.255-240.9.8.7.in-addr.arpa<\/b>. Vagy \u00edgy, ha szimbolikus aldomaint haszn\u00e1lunk: <b>241.oursuperclient.9.8.7.in-addr.arpa<\/b>. Ez k\u00fcl\u00f6nb\u00f6zik a szok\u00e1sos form\u00e1tumt\u00f3l: <b>241.9.8.7.in-addr.arpa<\/b>.<\/p>\n<p>Saj\u00e1t kez\u00fckkel ilyen k\u00e9rd\u00e9st neh\u00e9z megoldani. Ha pedig siker\u00fcl, akkor is k\u00e9rd\u00e9ses, hogyan lehet ezt a val\u00f3s \u00e9letben \u00e9rv\u00e9nyes\u00edteni. Mert a k\u00e9rd\u00e9s\u00fcnkre <b>7.8.9.241<\/b> tov\u00e1bbra is a szolg\u00e1ltat\u00f3 DNS-e v\u00e1laszol, \u00e9s nem az \u00fcgyf\u00e9l DNS-e.<\/p>\n<p>Na, itt l\u00e9pnek j\u00e1t\u00e9kba a <b>CNAME<\/b>.<\/p>\n<p>A szolg\u00e1ltat\u00f3 oldal\u00e1n az alh\u00e1l\u00f3zat \u00f6sszes IP-c\u00edm\u00e9hez alias-t kell l\u00e9trehozni, amely \u00e1tkonvert\u00e1lja a k\u00e9rd\u00e9seket az \u00fcgyf\u00e9l DNS-\u00e9re.<\/p>\n<pre><code class=\"plaintext\">255-240  IN  NS      ns1.client.domain.\n241     IN  CNAME   241.255-240\n242     IN  CNAME   242.255-240\nstb.\n<\/code><\/pre>\n<p>\nEz a szorgalmasaknak =). <\/p>\n<p>A lust\u00e1bbaknak a k\u00f6vetkez\u0151 konstrukci\u00f3 lesz j\u00f3:<\/p>\n<pre><code class=\"plaintext\">255-240  IN  NS      ns1.client.domain.\n$GENERATE 240-255 $ CNAME $.255-240<\/code><\/pre>\n<p>\nMost az inform\u00e1ci\u00f3 k\u00e9r\u00e9s\u00e9nek a c\u00edme <b>7.8.9.241<\/b> a <b>241.9.8.7.in-addr.arpa<\/b> a szolg\u00e1ltat\u00f3 DNS-szerver\u00e9n \u00e1talakul <b>241.255-240.9.8.7.in-addr.arpa<\/b> \u00e9s \u00e1tmegy az \u00fcgyf\u00e9l DNS-\u00e9re. <\/p>\n<p>Az \u00fcgyf\u00e9l oldal\u00e1n ezeket a k\u00e9r\u00e9seket kell feldolgozni. Ennek megfelel\u0151en l\u00e9trehozunk egy z\u00f3n\u00e1t <b>255-240.9.8.7.in-addr.arpa<\/b>. Ebben elvileg visszafel\u00e9 rekordokat helyezhet\u00fcnk el b\u00e1rmilyen IP c\u00edmhez az eg\u00e9sz alh\u00e1l\u00f3zatra \/24, de csak azokr\u00f3l fognak k\u00e9rdezni, amelyeket a szolg\u00e1ltat\u00f3 tov\u00e1bb\u00edt nek\u00fcnk, sz\u00f3val nem fogunk tudni j\u00e1tszadozni =).<br \/>\nA p\u00e9lda kedv\u00e9\u00e9rt m\u00e9g egyszer bemutatom az \u00fcgyf\u00e9l oldal\u00e1n l\u00e9v\u0151 visszafel\u00e9 z\u00f3naf\u00e1jl tartalm\u00e1t:<\/p>\n<pre><code class=\"plaintext\">$ORIGIN 255-240.9.8.7.in-addr.arpa.\n$TTL 1W\n@                       1D IN SOA       ns1.client.domain. root.client.domain. (\n                        2008152607      ; sorozatsz\u00e1m\n                        3H              ; friss\u00edt\u00e9s\n                        15M             ; \u00fajrapr\u00f3b\u00e1lkoz\u00e1s\n                        1W              ; lej\u00e1rati id\u0151\n                        1D )            ; minimum\n@                       IN NS        ns1.client.domain.\n@                       IN NS        ns2.client.domain.\n241                     IN PTR          test.client.domain.\n242                     IN PTR          test2.client.domain.\n245                     IN PTR          test5.client.domain.\n<\/code><\/pre>\n<p>\nAmiatt, hogy a szolg\u00e1ltat\u00f3k\u00e9nt CNAME-t haszn\u00e1lunk, ez\u00e9rt v\u00e1laszul k\u00e9t bejegyz\u00e9st kapunk az adatok lek\u00e9rdez\u00e9s\u00e9re. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/lir\/ipv4\/\"   title=\"IP-c\u00edm\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"586\">IP-c\u00edm<\/a> nem egyet.<\/p>\n<pre><code class=\"plaintext\">#&gt;  host 7.8.9.245 \n245.9.8.7.in-addr.arpa is an alias for 245.255-240.9.8.7.in-addr.arpa.\n245.255-240.9.8.7.in-addr.arpa domain name pointer test5.client.domain.<\/code><\/pre>\n<p>\n<i><b>Ne feledkezz meg az ACL helyes be\u00e1ll\u00edt\u00e1s\u00e1r\u00f3l sem. Mert \u00e9rtelmetlen a PTR-z\u00f3n\u00e1t megszerezni, ha senkinek sem v\u00e1laszolsz k\u00edv\u00fclr\u0151l =).<\/b><\/i><br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/451890\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0441\u0442\u0430\u043b\u0430 \u043e\u0434\u043d\u0430\u0436\u0434\u044b \u043f\u0435\u0440\u0435\u0434\u043e \u043c\u043d\u043e\u0439 \u0437\u0430\u0434\u0430\u0447\u0430, \u043e\u0442\u0434\u0430\u0442\u044c \u043e\u0434\u043d\u043e\u043c\u0443 \u0438\u0437 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u0432 \u043f\u0440\u0430\u0432\u043e \u043d\u0430 \u0440\u0435\u0434\u0430\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 PTR-\u0437\u0430\u043f\u0438\u0441\u0435\u0439 \u043e\u0442\u0434\u0430\u043d\u043d\u043e\u0439 \u0435\u043c\u0443 \u043f\u043e\u0434\u0441\u0435\u0442\u0438 \/28. \u0410\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u0438 \u0434\u043b\u044f \u0440\u0435\u0434\u0430\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043a BIND \u0438\u0437\u0432\u043d\u0435 \u0443 \u043c\u0435\u043d\u044f \u043d\u0435\u0442. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u044f \u0440\u0435\u0448\u0438\u043b \u043f\u043e\u0439\u0442\u0438 \u0434\u0440\u0443\u0433\u0438\u043c \u043f\u0443\u0442\u0435\u043c \u2014 \u0434\u0435\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u043b\u0438\u0435\u043d\u0442\u0443 \u043a\u0443\u0441\u043e\u043a PTR-\u0437\u043e\u043d\u044b \u043f\u043e\u0434\u0441\u0435\u0442\u0438 \/24. \u041a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u0431\u044b \u2014 \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u0440\u043e\u0449\u0435? \u041f\u0440\u043e\u0441\u0442\u043e \u043d\u0443\u0436\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043f\u0440\u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u043c \u043f\u043e\u0434\u0441\u0435\u0442\u044c \u0438 \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u043c \u043d\u0430 \u043d\u0443\u0436\u043d\u044b\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33717","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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