{"id":162,"date":"2015-12-20T18:29:39","date_gmt":"2015-12-20T16:29:39","guid":{"rendered":"http:\/\/yusufziyagulec.com\/?p=162"},"modified":"2015-12-20T18:29:39","modified_gmt":"2015-12-20T16:29:39","slug":"scavenging-period-dhcp-lease-iliskisi-ve-onerilen-degerler","status":"publish","type":"post","link":"https:\/\/yusufziyagulec.com\/blog\/scavenging-period-dhcp-lease-iliskisi-ve-onerilen-degerler\/","title":{"rendered":"Scavenging period &#038; DHCP lease ili\u015fkisi ve \u00f6nerilen de\u011ferler"},"content":{"rendered":"<p>Scavenging aral\u0131\u011f\u0131 ve DHCP lease s\u00fcresinin do\u011fru belirlenmesi ge\u00e7ersiz DNS kay\u0131tlar\u0131n\u0131n olu\u015fmas\u0131n\u0131 engelleyerek ya\u015fanabilecek bir\u00e7ok problemin \u00f6n\u00fcne ge\u00e7er. Baz\u0131 durumlarda Microsoft&#8217;un varsay\u0131lan de\u011ferleri organizasyona uygun olmayabilir.<\/p>\n<p><strong>\u00d6rnek Olay<\/strong><\/p>\n<p>A\u015fa\u011f\u0131daki durumu inceleyelim:<\/p>\n<p>DHCP<\/p>\n<ul>\n<li>DHCP scope&#8217;unun varsay\u0131lan lease s\u00fcresi 8 g\u00fcn olsun.<\/li>\n<li>A-Bilgisayar\u0131 8 g\u00fcn boyunca IP adresini yenilemez ve IP adresi expire olur.<\/li>\n<li>B-bilgisayar\u0131 DHCP sunucudan yeni bir IP adresi ister.<\/li>\n<li>DHCP sunucusu B Bilgisayar\u0131na daha \u00f6nce A Bilgisayar\u0131na atad\u0131\u011f\u0131 IP&#8217;yi verir.<\/li>\n<\/ul>\n<p>DNS<\/p>\n<ul>\n<li>Scavenging s\u00fcreleri varsay\u0131lan de\u011ferler olan No-Refresh Interval = 7 g\u00fcn ve Refresh Interval = 7 g\u00fcn olsun.<\/li>\n<li>Scavenging period i\u00e7in de yine varsay\u0131lan de\u011fer olan 7 g\u00fcn ayarlanm\u0131\u015f olsun.<\/li>\n<li>A-Bilgisayar\u0131 DNS kayd\u0131n\u0131 8 g\u00fcn \u00f6nce yenilemi\u015fti. (DHCP lease kayd\u0131 da ayn\u0131 zamanda g\u00fcncellenmi\u015fti)<\/li>\n<li>A-Bilgisayar\u0131 DNS kayd\u0131n\u0131n sahibi oldu\u011fundan bu kay\u0131t DHCP sunucusu taraf\u0131ndan silinemez (varsay\u0131lan ayar b\u00f6yledir.)<\/li>\n<li>B-Bilgisayar\u0131 kendi DNS kayd\u0131n\u0131 DHCP sunucudan alm\u0131\u015f oldu\u011fu IP adresiyle kaydeder.<\/li>\n<li>Bu IP adresi daha \u00f6nce A-Bilgisayar\u0131na verilen adresle ayn\u0131d\u0131r.<\/li>\n<li>Bu durumda DNS sunucusu A-Bilgisayar\u0131n\u0131n DNS kayd\u0131n\u0131 6 g\u00fcn boyunca daha silemeyecektir.<\/li>\n<\/ul>\n<p><strong>\u00c7\u00f6z\u00fcm<\/strong><\/p>\n<p>Microsoft taraf\u0131ndan \u00f6nerilen scavenging interval s\u00fcresi 1-3 g\u00fcnd\u00fcr. Varsay\u0131lan de\u011fer olan 7 g\u00fcn, ge\u00e7ersiz durumdaki (stale) kay\u0131tlar\u0131n DNS&#8217;de kalma s\u00fcresini uzat\u0131r.<\/p>\n<p><strong>1- DHCP lease s\u00fcresini &#8220;no-refresh + refresh&#8221; interval de\u011ferine e\u015fit olacak \u015fekilde ayarlay\u0131n.<\/strong><\/p>\n<p>\u00d6rnek olayda DHCP lease s\u00fcresi 14 g\u00fcnd\u00fcr.<\/p>\n<p>Avantajlar\u0131:<\/p>\n<ul>\n<li>DHCP lease&#8217;leri DNS kayd\u0131 silinene kadar ba\u015fka herhangi bir client taraf\u0131ndan al\u0131namaz.<\/li>\n<li>Bu y\u00f6ntem kolayd\u0131r.<\/li>\n<\/ul>\n<p>Dezavantajlar\u0131:<\/p>\n<ul>\n<li>DHCP scope&#8217;undaki uygun IP say\u0131s\u0131 azsa, client&#8217;lara atanacak IP adresleri t\u00fckenebilir.<\/li>\n<li>K\u00fc\u00e7\u00fck zaman farklar\u0131 nedeniyle kay\u0131tlar\u0131n ufak bir y\u00fczdesi lease s\u00fcresi dolsa bile silinemeyebilir. Scavenging aral\u0131\u011f\u0131n\u0131 1 g\u00fcne \u00e7ekmek bir sonraki g\u00fcn stale kay\u0131tlar\u0131n silinmesini sa\u011flayacakt\u0131r.<\/li>\n<\/ul>\n<p><strong>2- No refresh + Refresh interval s\u00fcresini DHCP lease s\u00fcresine e\u015fitleyecek \u015fekilde azalt\u0131n. <\/strong><\/p>\n<p>\u00d6rnek olay\u0131m\u0131zda &#8220;No-refresh&#8221; ve &#8220;refresh&#8221; aral\u0131klar\u0131n\u0131 4 g\u00fcne indirdik.<\/p>\n<p>Avantajlar\u0131:<\/p>\n<ul>\n<li>Mevcut DNS kay\u0131tlar\u0131 etkin bir bi\u00e7imde temizlenir.<\/li>\n<li>Bu y\u00f6ntemi uygulamak kolayd\u0131r.<\/li>\n<\/ul>\n<p>Dezavantajlar\u0131:<\/p>\n<ul>\n<li>Active Directory replikasyonu artacakt\u0131r. Bunun nedeni DNS kay\u0131tlar\u0131n\u0131n client&#8217;lar taraf\u0131ndan daha s\u0131k g\u00fcncellenecek olmas\u0131d\u0131r (7 g\u00fcnde bir yerine 4 g\u00fcnde bir.)<\/li>\n<li>K\u00fc\u00e7\u00fck zaman farklar\u0131 nedeniyle kay\u0131tlar\u0131n k\u00fc\u00e7\u00fck bir y\u00fczdesi silinmeyebilir. Scavengin interval&#8217;i 1 g\u00fcn olarak ayarlamak ge\u00e7ersiz kay\u0131tlar\u0131n ertesi g\u00fcn silinmesini sa\u011flayacakt\u0131r.<\/li>\n<\/ul>\n<p><strong>3- DHCP sunucusunun client&#8217;lar ad\u0131na adresleri kaydetmesine izin verin<\/strong><\/p>\n<p>Avantajlar\u0131:<\/p>\n<ul>\n<li>DHCP sunucusu DNS kayd\u0131n\u0131 lease s\u00fcresi expire olur olmaz siler.<\/li>\n<li>Do\u011fru konfig\u00fcre edildi\u011finde duplicate kay\u0131t olu\u015fmaz.<\/li>\n<\/ul>\n<p>Dezavantajlar\u0131:<\/p>\n<ul>\n<li>Kurulumu biraz daha karma\u015f\u0131kt\u0131r.<\/li>\n<li>DHCP hizmetini y\u00fcr\u00fctmek ad\u0131na bir servis hesab\u0131na ihtiya\u00e7 vard\u0131r.<\/li>\n<\/ul>\n<p><em>Kaynak: http:\/\/blogs.technet.com\/b\/askpfe\/archive\/2011\/06\/03\/how-dns-scavenging-and-the-dhcp-lease-duration-relate.aspx<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scavenging aral\u0131\u011f\u0131 ve DHCP lease s\u00fcresinin do\u011fru belirlenmesi ge\u00e7ersiz DNS kay\u0131tlar\u0131n\u0131n olu\u015fmas\u0131n\u0131 engelleyerek ya\u015fanabilecek bir\u00e7ok problemin \u00f6n\u00fcne ge\u00e7er. Baz\u0131 durumlarda Microsoft&#8217;un varsay\u0131lan de\u011ferleri organizasyona uygun olmayabilir. \u00d6rnek Olay A\u015fa\u011f\u0131daki durumu inceleyelim: DHCP DHCP scope&#8217;unun varsay\u0131lan lease s\u00fcresi 8 g\u00fcn olsun. A-Bilgisayar\u0131 8 g\u00fcn boyunca IP adresini yenilemez ve IP adresi expire olur. B-bilgisayar\u0131 DHCP sunucudan&#8230; <a class=\"more-link\" href=\"https:\/\/yusufziyagulec.com\/blog\/scavenging-period-dhcp-lease-iliskisi-ve-onerilen-degerler\/\">Continue reading <span class=\"meta-nav\">&#8594;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[70,69,73,71,68,72],"class_list":["post-162","post","type-post","status-publish","format-standard","hentry","category-windows-server","tag-best-practice","tag-dhcp-lease","tag-gecersiz-dns-kayitlarini-silme","tag-refresh-interval","tag-scavenging","tag-scavenging-period"],"_links":{"self":[{"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/posts\/162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/comments?post=162"}],"version-history":[{"count":1,"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/posts\/162\/revisions"}],"predecessor-version":[{"id":163,"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/posts\/162\/revisions\/163"}],"wp:attachment":[{"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/media?parent=162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/categories?post=162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yusufziyagulec.com\/blog\/wp-json\/wp\/v2\/tags?post=162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}