{"id":9871,"date":"2025-11-24T10:18:07","date_gmt":"2025-11-24T07:18:07","guid":{"rendered":"https:\/\/www.turk.net\/blog\/?p=9871"},"modified":"2025-12-17T10:18:35","modified_gmt":"2025-12-17T07:18:35","slug":"firewall-guvenlik-duvari-nedir-ne-ise-yarar","status":"publish","type":"post","link":"https:\/\/www.turk.net\/blog\/firewall-guvenlik-duvari-nedir-ne-ise-yarar\/","title":{"rendered":"Firewall (G\u00fcvenlik Duvar\u0131) Nedir? Ne \u0130\u015fe Yarar?"},"content":{"rendered":"

Siber g\u00fcvenlik stratejisinin temelini olu\u015fturan en \u00f6nemli ara\u00e7lardan biri \u015f\u00fcphesiz Firewall (G\u00fcvenlik Duvar\u0131)’d\u0131r. Bir a\u011f g\u00fcvenli\u011fi sistemi olarak tasarlanan bu teknoloji, cihazlar\u0131m\u0131z\u0131n ve verilerimizin d\u0131\u015f tehditlere kar\u015f\u0131 ilk savunma hatt\u0131n\u0131 olu\u015fturur. A\u011f trafi\u011fini izleyerek, \u00f6nceden belirlenmi\u015f g\u00fcvenlik politikalar\u0131na uymayan her t\u00fcrl\u00fc giri\u015fimi engeller.\u00a0<\/span><\/p>\n

Firewall (G\u00fcvenlik Duvar\u0131) Nedir?<\/span><\/h2>\n

Firewall, yani G\u00fcvenlik Duvar\u0131, g\u00fcvenilir bir i\u00e7 a\u011f (\u00f6rne\u011fin, evindeki veya i\u015fyerindeki a\u011f\u0131n) ile g\u00fcvenilir olmayan bir d\u0131\u015f a\u011f (\u00f6rne\u011fin, \u0130nternet) aras\u0131ndaki a\u011f trafi\u011fini izleyen ve kontrol eden bir a\u011f g\u00fcvenlik sistemidir.<\/span><\/p>\n

Belirlenen g\u00fcvenlik kurallar\u0131na g\u00f6re \u00e7al\u0131\u015fan bir bariyer (engel) g\u00f6revi g\u00f6r\u00fcr. Bu bariyer, yaln\u0131zca izin verilen trafi\u011fin ge\u00e7mesine olanak tan\u0131rken, tehlikeli veya yetkisiz trafi\u011fi engeller. Yaz\u0131l\u0131m tabanl\u0131 (bilgisayara kurulan program) veya donan\u0131m tabanl\u0131 (fiziksel bir cihaz) olabilir.<\/span><\/p>\n

Firewall (G\u00fcvenlik Duvar\u0131) Ne \u0130\u015fe Yarar?<\/span><\/h2>\n

Firewall’un temel i\u015flevi, a\u011f\u0131n\u0131 siber tehditlere kar\u015f\u0131 korumakt\u0131r. Ba\u015fl\u0131ca g\u00f6revleri \u015funlard\u0131r:<\/span><\/p>\n

    \n
  • Yetkisiz Eri\u015fimi Engelleme: \u0130nternet’ten veya di\u011fer a\u011flardan sistemine izinsiz giri\u015f denemelerini bloke eder.<\/span><\/li>\n
  • Siber Sald\u0131r\u0131lara Kar\u015f\u0131 Koruma: K\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar\u0131n (vir\u00fcsler, Truva atlar\u0131, solucanlar) a\u011f trafi\u011fi yoluyla bula\u015fmas\u0131n\u0131 \u00f6nlemeye yard\u0131mc\u0131 olur.<\/span><\/li>\n
  • Veri S\u0131z\u0131nt\u0131s\u0131n\u0131 \u00d6nleme: \u0130\u00e7 a\u011fdan d\u0131\u015far\u0131ya do\u011fru giden trafi\u011fi de denetleyerek, hassas verilerin izinsiz olarak d\u0131\u015far\u0131 s\u0131zmas\u0131n\u0131 engeller.<\/span><\/li>\n
  • \u0130stenmeyen \u0130\u00e7erik ve Siteleri Engelleme: Belirli web sitelerine, uygulamalara veya hizmetlere eri\u015fimi k\u0131s\u0131tlamak i\u00e7in kullan\u0131labilir.<\/span><\/li>\n
  • A\u011f G\u00fcvenlik Politikas\u0131 Uygulama: \u015eirket veya ev a\u011f\u0131nda, kimin neye ne zaman eri\u015febilece\u011fine dair belirlenmi\u015f kurallar\u0131 uygular.<\/span><\/li>\n<\/ul>\n

    G\u00fcvenlik Duvar\u0131 Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/span><\/h2>\n

    G\u00fcvenlik duvar\u0131, bir a\u011fa gelen ve giden t\u00fcm veri ak\u0131\u015f\u0131n\u0131 s\u00fcrekli olarak denetleyen bir trafik polisi gibi \u00e7al\u0131\u015f\u0131r. \u00c7al\u0131\u015fma prensibi, veri paketlerinin filtrelenmesine dayan\u0131r:<\/span><\/p>\n

      \n
    1. Paket \u0130ncelemesi: A\u011f \u00fczerinden gelen veya giden her veri, k\u00fc\u00e7\u00fck birimler olan veri paketleri halinde iletilir. Firewall, bu paketleri tek tek yakalar.<\/span><\/li>\n
    2. Kural E\u015fle\u015ftirme: Her paket \u00fczerinde, Kaynak IP adresi, Hedef IP adresi, Port numaras\u0131 (hizmet kap\u0131s\u0131) ve Kullan\u0131lan Protokol (HTTP, TCP, UDP vb.) gibi bilgileri inceler.<\/span><\/li>\n
    3. Karar Verme: Bu bilgileri, \u00f6nceden tan\u0131mlanm\u0131\u015f g\u00fcvenlik kurallar\u0131 (kural k\u00fcmeleri) ile kar\u015f\u0131la\u015ft\u0131r\u0131r. <\/span>\u0130zin Ver: Paket, kurallara uyuyorsa ve g\u00fcvenli kabul ediliyorsa ge\u00e7i\u015fine izin verilir. <\/span>Engelle: Paket, kurallara uymuyorsa, \u015f\u00fcpheliyse veya kara listedeki bir kaynaktan geliyorsa an\u0131nda reddedilir ve a\u011fa giri\u015fi engellenir.<\/span><\/li>\n<\/ol>\n

      G\u00fcncel g\u00fcvenlik duvarlar\u0131, sadece temel bilgileri de\u011fil, ayn\u0131 zamanda ba\u011flant\u0131n\u0131n bir par\u00e7as\u0131 olup olmad\u0131\u011f\u0131n\u0131 ve durumunu da takip eden Durum Denetimi (Stateful Inspection) gibi daha geli\u015fmi\u015f filtreleme y\u00f6ntemlerini kullan\u0131r.<\/span><\/p>\n

      Firewall T\u00fcrleri Nelerdir?<\/span><\/h2>\n

      G\u00fcvenlik duvarlar\u0131, farkl\u0131 mimari yap\u0131lara ve filtreleme yeteneklerine g\u00f6re \u00e7e\u015fitlilik g\u00f6sterir. Genel olarak iki ana yap\u0131sal t\u00fcre ayr\u0131l\u0131rlar: Donan\u0131msal ve Yaz\u0131l\u0131msal firewall’lar.\u00a0<\/span><\/p>\n

      Donan\u0131msal olanlar, genellikle birden fazla cihaz\u0131 korumak i\u00e7in a\u011f ile \u0130nternet aras\u0131na yerle\u015ftirilen fiziksel cihazlard\u0131r ve b\u00fcy\u00fck a\u011flar i\u00e7in idealdir. Yaz\u0131l\u0131msal firewall’lar ise tek bir cihaz\u0131n (bilgisayar\u0131n) i\u015fletim sistemine kurulur ve o cihaz\u0131 korumakla sorumludur.<\/span><\/p>\n

      Filtreleme teknolojilerine g\u00f6re ise ba\u015fl\u0131ca t\u00fcrler \u015funlard\u0131r:<\/span><\/p>\n

      Paket Filtreleme (Packet-Filtering) Firewall<\/span><\/h3>\n

      En temel g\u00fcvenlik duvar\u0131 t\u00fcr\u00fcd\u00fcr. Gelen ve giden her veri paketinin sadece ba\u015fl\u0131k bilgilerini (kaynak\/hedef IP, port numaras\u0131 ve protokol) inceler. E\u011fer paket, \u00f6nceden tan\u0131mlanm\u0131\u015f kurallara uyuyorsa ge\u00e7i\u015fine izin verilir. H\u0131zl\u0131d\u0131r ancak i\u00e7eri\u011fi kontrol etmedi\u011fi i\u00e7in kolayca atlat\u0131labilir.<\/span><\/p>\n

      Durum Denetimli (Stateful Inspection) Firewall<\/span><\/h3>\n

      En yayg\u0131n kullan\u0131lan t\u00fcrd\u00fcr. Paket ba\u015fl\u0131klar\u0131n\u0131n yan\u0131 s\u0131ra ba\u011flant\u0131n\u0131n durumunu da s\u00fcrekli takip eder. Yani, bir paketin daha \u00f6nce kurulmu\u015f g\u00fcvenilir bir ba\u011flant\u0131n\u0131n par\u00e7as\u0131 olup olmad\u0131\u011f\u0131n\u0131 kontrol eder ve \u00e7ok daha y\u00fcksek bir g\u00fcvenlik seviyesi sa\u011flar.<\/span><\/p>\n

      Vekil (Proxy) Firewall<\/span><\/h3>\n

      Uygulama katman\u0131nda \u00e7al\u0131\u015f\u0131r. Kaynak ve hedef aras\u0131ndaki ba\u011flant\u0131y\u0131 keserek arac\u0131 (Proxy) g\u00f6revi g\u00f6r\u00fcr. Gelen paketi kendi \u00fczerinde a\u00e7ar, t\u00fcm i\u00e7eri\u011fini derinlemesine inceler ve ard\u0131ndan temizlenmi\u015f bir paketi hedefe iletir. En y\u00fcksek g\u00fcvenlik seviyesini sunar, ancak performans\u0131 d\u00fc\u015f\u00fcrebilir.<\/span><\/p>\n

      Yeni Nesil G\u00fcvenlik Duvar\u0131 (NGFW)<\/span><\/h3>\n

      Geleneksel g\u00fcvenlik duvarlar\u0131n\u0131n yeteneklerine ek olarak, Uygulama Bilinci (Application Awareness), Sald\u0131r\u0131 \u00d6nleme Sistemi (IPS) ve di\u011fer geli\u015fmi\u015f g\u00fcvenlik \u00f6zelliklerini b\u00fcnyesinde bar\u0131nd\u0131ran modern \u00e7\u00f6z\u00fcmlerdir. G\u00fcn\u00fcm\u00fcz\u00fcn karma\u015f\u0131k ve geli\u015fmi\u015f tehditlerine kar\u015f\u0131 kapsaml\u0131 koruma sa\u011flamak i\u00e7in tasarlanm\u0131\u015ft\u0131r.<\/span><\/p>\n

      Firewall ile Antivir\u00fcs Aras\u0131ndaki Farklar Nelerdir?<\/span><\/h2>\n

      Firewall ve Antivir\u00fcs, siber g\u00fcvenlikte birbirini tamamlayan, ancak i\u015flevleri tamamen farkl\u0131 olan iki temel bile\u015fendir:<\/span><\/p>\n

      1. Temel \u0130\u015flev ve Odak Alan\u0131<\/span><\/h3>\n
        \n
      • Firewall: Temel i\u015flevi, a\u011f s\u0131n\u0131r\u0131n\u0131 korumakt\u0131r. A\u011f \u00fczerinden gelen ve giden veri trafi\u011fini izler ve kontrol eder. Odak noktas\u0131, k\u00f6t\u00fc niyetli veya yetkisiz trafi\u011fin cihaza ula\u015fmas\u0131n\u0131 engellemektir.\u00a0<\/span><\/li>\n
      • Antivir\u00fcs: Temel i\u015flevi, cihaz\u0131n i\u00e7ini korumakt\u0131r. Bilgisayar\u0131n dosya sistemini s\u00fcrekli tarayarak sisteme girmi\u015f veya yerle\u015fmi\u015f olan k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar\u0131 (vir\u00fcsler, Truva atlar\u0131, fidye yaz\u0131l\u0131mlar\u0131 vb.) tespit edip temizlemektir.<\/span><\/li>\n<\/ul>\n

        2. Koruma Mekanizmas\u0131<\/span><\/h3>\n
          \n
        • Firewall: \u00d6nceden tan\u0131mlanm\u0131\u015f kurallara dayal\u0131 \u00e7al\u0131\u015f\u0131r. Bir veri paketinin IP adresi, port numaras\u0131 gibi bilgileri bu kurallarla e\u015fle\u015fmiyorsa, paket reddedilir ve a\u011fa giri\u015fi kesilir.<\/span><\/li>\n
        • Antivir\u00fcs: Daha \u00e7ok imza tabanl\u0131 analiz ve davran\u0131\u015f analizi y\u00f6ntemleriyle \u00e7al\u0131\u015f\u0131r. Bilinen zararl\u0131 yaz\u0131l\u0131m imzalar\u0131n\u0131 i\u00e7eren bir veri taban\u0131n\u0131 kullanarak dosyalar\u0131 tarar veya \u015f\u00fcpheli davran\u0131\u015f sergileyen programlar\u0131 otomatik olarak durdurur.<\/span><\/li>\n<\/ul>\n

          3. Kullan\u0131m Gereklili\u011fi<\/span><\/h3>\n

          Her iki g\u00fcvenlik \u00e7\u00f6z\u00fcm\u00fcn\u00fcn de modern bir cihaz veya a\u011f i\u00e7in vazge\u00e7ilmez oldu\u011funu bilmelisin. Firewall ne kadar iyi olursa olsun, bir vir\u00fcs bir USB bellek veya ba\u015fka bir fiziksel yol ile sisteme girebilir; bu noktada Antivir\u00fcs devreye girer. Ayn\u0131 \u015fekilde, Antivir\u00fcs en g\u00fcncel s\u00fcr\u00fcmde olsa bile, k\u00f6t\u00fc niyetli bir a\u011f sald\u0131r\u0131s\u0131n\u0131 veya port taramas\u0131n\u0131 durduracak olan temel sistem Firewall’dur.<\/span><\/p>\n

          Firewall (G\u00fcvenlik Duvar\u0131) Hakk\u0131nda S\u0131k\u00e7a Sorulan Sorular (SSS)<\/span><\/h2>\n

          Donan\u0131msal Firewall ile Yaz\u0131l\u0131msal Firewall Aras\u0131ndaki Fark Nedir?<\/span><\/h3>\n

          Donan\u0131msal firewall, birden fazla cihaz\u0131 koruyan fiziksel bir cihazd\u0131r. Yaz\u0131l\u0131msal firewall ise bilgisayara kurulur ve yaln\u0131zca o cihaz\u0131n a\u011f trafi\u011fini kontrol eder.<\/span><\/p>\n

          Firewall Vir\u00fcslere Kar\u015f\u0131 Tek Ba\u015f\u0131na Yeterli midir?<\/span><\/h3>\n

          Hay\u0131r. Firewall a\u011f trafi\u011fini kontrol eder ancak sisteme giren k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar\u0131 temizleyemez. Bu nedenle firewall ile antivir\u00fcs birlikte kullan\u0131lmal\u0131d\u0131r.<\/span><\/p>\n

          Firewall Ev Kullan\u0131c\u0131lar\u0131 i\u00e7in Gerekli midir?<\/span><\/h3>\n

          Evet. Ev a\u011flar\u0131 da siber sald\u0131r\u0131lar\u0131n hedefi olabilir. Modemlerin \u00e7o\u011funda temel firewall bulunur, fakat belirtilmi\u015f kurallar\u0131n g\u00fcncel ve aktif olmas\u0131 g\u00fcvenli\u011fi art\u0131r\u0131r.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

          Siber g\u00fcvenlik stratejisinin temelini olu\u015fturan en \u00f6nemli ara\u00e7lardan biri \u015f\u00fcphesiz Firewall (G\u00fcvenlik Duvar\u0131)’d\u0131r. Bir a\u011f g\u00fcvenli\u011fi sistemi olarak tasarlanan bu teknoloji, cihazlar\u0131m\u0131z\u0131n ve verilerimizin d\u0131\u015f tehditlere kar\u015f\u0131 ilk savunma hatt\u0131n\u0131 olu\u015fturur. A\u011f trafi\u011fini izleyerek, \u00f6nceden belirlenmi\u015f g\u00fcvenlik politikalar\u0131na uymayan her t\u00fcrl\u00fc giri\u015fimi engeller.\u00a0 Firewall (G\u00fcvenlik Duvar\u0131) Nedir? Firewall, yani G\u00fcvenlik Duvar\u0131, g\u00fcvenilir bir i\u00e7 a\u011f […]<\/p>\n","protected":false},"author":7,"featured_media":9872,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-9871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-teknoloji"],"acf":[],"yoast_head":"\nFirewall (G\u00fcvenlik Duvar\u0131) Nedir? Ne \u0130\u015fe Yarar? - Turknet Blog<\/title>\n<meta name=\"description\" content=\"Firewall yani g\u00fcvenlik duvar\u0131 nedir ve nas\u0131l \u00e7al\u0131\u015f\u0131r? G\u00fcvenlik duvar\u0131n\u0131n a\u011f g\u00fcvenli\u011findeki rol\u00fc ve kullan\u0131m t\u00fcrlerini \u00f6\u011frenmek i\u00e7in yaz\u0131m\u0131a t\u0131klay\u0131n.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.turk.net\/blog\/firewall-guvenlik-duvari-nedir-ne-ise-yarar\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Firewall (G\u00fcvenlik Duvar\u0131) Nedir? Ne \u0130\u015fe Yarar? - Turknet Blog\" \/>\n<meta property=\"og:description\" content=\"Firewall yani g\u00fcvenlik duvar\u0131 nedir ve nas\u0131l \u00e7al\u0131\u015f\u0131r? G\u00fcvenlik duvar\u0131n\u0131n a\u011f g\u00fcvenli\u011findeki rol\u00fc ve kullan\u0131m t\u00fcrlerini \u00f6\u011frenmek i\u00e7in yaz\u0131m\u0131a t\u0131klay\u0131n.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.turk.net\/blog\/firewall-guvenlik-duvari-nedir-ne-ise-yarar\/\" \/>\n<meta property=\"og:site_name\" content=\"Turknet Blog\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-24T07:18:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-17T07:18:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.turk.net\/blog\/wp-content\/uploads\/firewall-guvenlik-duvari-nedir-ne-ise-yarar.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1124\" \/>\n\t<meta property=\"og:image:height\" content=\"752\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Turknet Blog Admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Turknet Blog Admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.turk.net\/blog\/firewall-guvenlik-duvari-nedir-ne-ise-yarar\/\",\"url\":\"https:\/\/www.turk.net\/blog\/firewall-guvenlik-duvari-nedir-ne-ise-yarar\/\",\"name\":\"Firewall (G\u00fcvenlik Duvar\u0131) Nedir? 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