{"id":5034,"date":"2020-06-17T12:45:17","date_gmt":"2020-06-17T09:45:17","guid":{"rendered":"https:\/\/www.limonhost.net\/makaleler\/?p=5034"},"modified":"2021-02-12T23:01:19","modified_gmt":"2021-02-12T20:01:19","slug":"firewall-nedir","status":"publish","type":"post","link":"https:\/\/www.limonhost.net\/makaleler\/nedir\/firewall-nedir\/","title":{"rendered":"Firewall Nedir? Donan\u0131msal Firewall Nedir?"},"content":{"rendered":"

Firewall Nedir? Donan\u0131msal Firewall Nedir?<\/span><\/h2>\n

Dijital g\u00fcvenlik modern g\u00fcvenlik anlam\u0131n\u0131n karakteristi\u011fini belirleyen \u00f6nemli \u00f6zelliklerden bir tanesi. Her ge\u00e7en g\u00fcn daha fazla insan ve i\u015fletme bulut sistemlerini kullan\u0131yor ve bir \u00e7ok ki\u015fi g\u00fcvenlik yaz\u0131l\u0131mlar\u0131n\u0131n %100 bir g\u00fcvenlik sa\u011flayaca\u011f\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcyor. Baz\u0131 noktalardan bak\u0131ld\u0131\u011f\u0131nda b\u00f6yle g\u00f6z\u00fckebilir ancak b\u00fcy\u00fck resime bak\u0131ld\u0131\u011f\u0131nda asl\u0131nda durum hi\u00e7 \u00f6yle de\u011fil. S\u00f6z konusu siber g\u00fcvenlik oldu\u011funda bir yaz\u0131l\u0131mdan \u00e7ok daha fazlas\u0131na ihtiya\u00e7 duyulmaktad\u0131r. Bir g\u00fcvenlik duvar\u0131 sadece bir bilgisayar program\u0131 formunda olabildi\u011fi gibi a\u011f ve internet aras\u0131nda bir katman g\u00f6revi g\u00f6ren fiziksel bir cihaz da olabilir. Donan\u0131msal Firewall potansiyel tehlikeleri a\u011f d\u0131\u015f\u0131nda tutar ve bir \u015fekilde i\u00e7eri giren tehditlerin yaratt\u0131\u011f\u0131 etkiyi k\u0131s\u0131tlar.\u00a0<\/span><\/p>\n

Donan\u0131msal Firewall Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/span><\/h2>\n

Her ne kadar firewall yaz\u0131l\u0131mlar\u0131 bireysel kullan\u0131c\u0131lar i\u00e7in \u00f6nemli bir g\u00fcvenlik sa\u011flasa da \u00f6zellikle i\u015fletmeler i\u00e7in yetersiz kalmaktad\u0131r. G\u00fcvenlik duvar\u0131 donan\u0131mlar\u0131 a\u011f katman\u0131nda bulundu\u011fu yer nedeniyle m\u00fckemmel bir g\u00fcvenlik sa\u011flamaktad\u0131r. Router ve di\u011fer her \u015feyin aras\u0131nda olan donan\u0131m gelen trafi\u011fi inceleyerek a\u011fa ba\u011fl\u0131 t\u00fcm cihazlar\u0131n g\u00fcvende kalmas\u0131n\u0131 sa\u011flamaktad\u0131r. Donan\u0131msal firewall taraf\u0131ndan sa\u011flanan g\u00fcvenlik i\u015fletim sistemine, taray\u0131c\u0131ya ya da a\u011f sistemlerinde y\u00fckl\u00fc olan di\u011fer yaz\u0131l\u0131mlara ba\u011fl\u0131 de\u011fildir. Bu tarz bir donan\u0131m a\u011f ile internet aras\u0131nda bir g\u00fcvenlik katman\u0131 olarak bulunmaktad\u0131r.\u00a0<\/span><\/p>\n

Firewall donan\u0131mlar\u0131n\u0131n b\u00fcy\u00fck bir k\u0131sm\u0131 internet i\u00e7eri\u011fini filtrelemek ve basit veri taramas\u0131 yapmaktan \u00e7ok daha fazlas\u0131n\u0131 ger\u00e7ekle\u015ftirmektedir. Bu donan\u0131mlar kullan\u0131c\u0131lara ayr\u0131ca \u00f6zelle\u015ftirme ve t\u00fcm a\u011f g\u00fcvenli\u011fini tek bir yerden y\u00f6netme gibi \u00f6nemli \u00f6zellikler sunmaktad\u0131r. Bir\u00e7ok donan\u0131msal firewall sadece \u00f6nceden olu\u015fturulmu\u015f kaynaklarda yer alan zararl\u0131 yaz\u0131l\u0131m listelerini kontrol etmiyor ayn\u0131 zamanda ak\u0131ll\u0131 \u00f6zellikleriyle \u015f\u00fcpheli aktiviteleri de takip edebiliyor. Bu sayede \u00f6zellikle bulut sistemlerini a\u011f\u0131rl\u0131kl\u0131 olarak kullanan i\u015fletmelerin y\u00fcksek say\u0131daki verilerinin analiz edilmesi kolay bir \u015fekilde ger\u00e7ekle\u015ftirilmektedir.<\/span><\/p>\n

Firewall donan\u0131mlar\u0131 asl\u0131nda tek ba\u015f\u0131na bir bilgisayar gibidir. Ancak i\u015f istasyonlar\u0131n\u0131n aksine tek bir ama\u00e7lar\u0131 vard\u0131r ve bu kullan\u0131ld\u0131\u011f\u0131 a\u011f \u00fczerinde g\u00fcvenli\u011fi sa\u011flamakt\u0131r. Bu nedenle yanl\u0131\u015fl\u0131kla devre d\u0131\u015f\u0131 b\u0131rak\u0131lmalar\u0131 ya da kapat\u0131lmalar\u0131 pek m\u00fcmk\u00fcn de\u011fildir. S\u00fcrekli olarak \u00e7al\u0131\u015fan donan\u0131msal firewall g\u00fcn\u00fcm\u00fczde her modern i\u015fletmenin ihtiya\u00e7 duydu\u011fu \u015fekilde 24 saat boyunca g\u00fcvenlik sa\u011flamaktad\u0131r. Ancak tek olumsuz y\u00f6nleri y\u00f6netiminin karma\u015f\u0131k ve zaman al\u0131c\u0131 olmas\u0131d\u0131r.\u00a0<\/span><\/p>\n

\"Donan\u0131msal<\/p>\n

Donan\u0131msal Firewall Getirdi\u011fi \u00d6zellikler<\/span><\/h3>\n

Donan\u0131msal firewall \u00f6zellikle ba\u015fta veri g\u00fcvenli\u011fi olmak \u00fczere a\u011f g\u00fcvenli\u011fi gibi ciddi ihtiya\u00e7lar\u0131 olan i\u015fletmelere \u00f6nemli avantajlar sunmaktad\u0131r.\u00a0<\/span><\/p>\n

Trafik Kontrol\u00fc<\/strong><\/p>\n

Donan\u0131msal firewall g\u00fcvenli sa\u011flad\u0131\u011f\u0131 a\u011fa gelen ve bu a\u011fdan \u00e7\u0131kan t\u00fcm trafi\u011fi kontrol etmektedir. \u015e\u00fcpheli bir aktivite ya da ba\u011flant\u0131 durumunda ise \u00f6nceden belirlenmi\u015f olan aksiyonlar\u0131 almaktad\u0131r.\u00a0<\/span><\/p>\n

Varsay\u0131lan Kurallar<\/strong><\/p>\n

Firewall donan\u0131mlar\u0131 ayn\u0131 zamanda tamamen \u00f6zelle\u015ftirilebilir kurallar sunmaktad\u0131r. Bu kurallar ihtiyaca g\u00f6re \u015fekillendirilerek t\u00fcm a\u011f trafi\u011fine uygulanabilmektedir.\u00a0<\/span><\/p>\n

Port Eri\u015fimi<\/strong><\/p>\n

Granular kontrol ile bir internet sitesinde gelen t\u00fcm trafi\u011fe ya da sadece geli\u015ftiricilere eri\u015fim izni verilebilmektedir. Bu \u015fekilde geli\u015ftiriciler port eri\u015fimi sayesinde SSH portlar\u0131ndan ya da RDP \u00fczerinden eri\u015fim sa\u011flayabilmektedir.\u00a0<\/span><\/p>\n

Ek Sunucu Kaynaklar\u0131<\/strong><\/p>\n

Donan\u0131msal firewall kullan\u0131lmayan ek sunucu kaynaklar\u0131na eri\u015fim sa\u011flamaktad\u0131r. Bu \u015fekilde sunucu \u00fczerinden g\u00fcvenlik duvar\u0131 yaz\u0131l\u0131mlar\u0131 pasif hale getirilebilir ve sadece donan\u0131msal firewall\u2019un i\u015fine devam etmesi sa\u011flanabilir, bellek bo\u015falt\u0131labilir, \u00f6nemli i\u015flemler i\u00e7in i\u015flemci g\u00fcc\u00fc atamas\u0131 yap\u0131labilir ve i\u015fletme i\u00e7in \u00e7al\u0131\u015fmaya devam etmesi hayati olan yaz\u0131l\u0131mlar \u00e7al\u0131\u015ft\u0131r\u0131labilir.\u00a0<\/span><\/p>\n

Donan\u0131msal Firewall Ne Yapar?<\/span><\/h3>\n

Donan\u0131msal firewall tamamen \u00f6zelle\u015ftirilebilir bir g\u00fcvenlik \u00f6nlemi sunmaktad\u0131r. Bu donan\u0131mlar a\u011fa ba\u011fl\u0131 cihazlar\u0131n internete ba\u011flanmas\u0131na ve veri transferi yapmas\u0131na izin verir. Trafik s\u00fcresince g\u00fcvenlik duvar\u0131 paketlerin heder k\u0131s\u0131mlar\u0131na bakarak verinin kaynak ve var\u0131\u015f adreslerini belirler. Donan\u0131m daha sonra by adresler ile belirlenmi\u015f olan kurallar\u0131 kar\u015f\u0131la\u015ft\u0131r\u0131r ve sonucunda ya ba\u011flant\u0131y\u0131 iptal eder ya da transfere devam eder.\u00a0<\/span><\/p>\n

Veri transferinin bir di\u011fer y\u00f6ntemi ise k\u0131saca SPI olarak bilinen Stateful Packet Inspection\u2019d\u0131r. Burada donan\u0131msal firewall paketin transferine ya da transferin iptaline donan\u0131m arkas\u0131nda bilgisayar ile karar verir. Ancak ayn\u0131 a\u011fa ba\u011fl\u0131 cihazlar aras\u0131nda ger\u00e7ekle\u015ftirilen veri transferinde g\u00fcvenlik duvar\u0131 herhangi bir \u015fekilde verinin i\u00e7eri\u011fine bakmamaktad\u0131r. Direkt olarak verinin g\u00fcvenli\u011fi oldu\u011funu kabul eder ve transferin tamamlanmas\u0131na izin vermektedir. Bu noktada a\u011fa ba\u011fl\u0131 bilgisayarlardan bir tanesi zararl\u0131 yaz\u0131l\u0131m i\u00e7erdi\u011finde bu yaz\u0131l\u0131m transfer esnas\u0131nda a\u011fa ba\u011fl\u0131 di\u011fer bilgisayarlara da bula\u015fmaktad\u0131r. Bu gibi durumlarda ise yaz\u0131l\u0131msal firewall devreye girmektedir.\u00a0<\/span><\/p>\n

\"Donan\u0131msal<\/p>\n

Donan\u0131msal Firewall\u2019un Art\u0131lar\u0131<\/strong><\/p>\n

Donan\u0131msal firewall \u00f6nemli art\u0131lara sahiptir ve g\u00fc\u00e7l\u00fc bir yaz\u0131l\u0131m ile birlikte kullan\u0131ld\u0131\u011f\u0131nda son derece g\u00fcvenli bir a\u011f alan\u0131 sunmaktad\u0131r.\u00a0<\/span><\/p>\n

    \n
  • A\u011f trafi\u011fi %100 kontrol edilebilir.<\/span><\/li>\n
  • Bir internet sitesinin t\u00fcm sayfalar\u0131n\u0131 ya da belirli bir kategoriye ait t\u00fcm internet sitelerini m\u00fckemmel bir \u015fekilde engeller.<\/span><\/li>\n
  • A\u011fa ba\u011fl\u0131 cihazlar \u00fczerinde tam kontrol sa\u011flar.\u00a0<\/span><\/li>\n
  • Ayl\u0131k ya da y\u0131ll\u0131k \u00f6demeye sahip olmad\u0131\u011f\u0131 i\u00e7in g\u00f6rece ucuz bir y\u00f6ntemdir.\u00a0<\/span><\/li>\n
  • G\u00fcvenli bir ortamda sakland\u0131\u011f\u0131nda hacklemek ya da pasif hale getirmek imkans\u0131zd\u0131r.\u00a0<\/span><\/li>\n
  • \u0130nan\u0131lmaz derecede h\u0131zl\u0131 \u00e7al\u0131\u015ft\u0131\u011f\u0131 \u00e7al\u0131\u015ft\u0131\u011f\u0131 i\u00e7in a\u011f performans\u0131n\u0131 olumsuz y\u00f6nde etki etmez.\u00a0<\/span><\/li>\n
  • Reklam engelleyici olarak kullan\u0131labilir.<\/span><\/li>\n<\/ul>\n

    Burada dikkat edilmesi gereken nokta s\u0131radan router cihazlar\u0131 donan\u0131msal firewall g\u00f6revi g\u00f6rmemektedir. T\u00fcm router cihazlar\u0131 k\u0131saca NAT olarak bilinen Network Address Translation \u00f6zelli\u011fi sayesinde istenmeyen gelen ba\u011flant\u0131lar engellenebilir ancak bu ger\u00e7ek anlamda bir g\u00fcvenlik duvar\u0131 de\u011fildir.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

    Firewall Nedir? Donan\u0131msal Firewall Nedir? Dijital g\u00fcvenlik modern g\u00fcvenlik anlam\u0131n\u0131n karakteristi\u011fini belirleyen \u00f6nemli \u00f6zelliklerden bir tanesi. Her ge\u00e7en g\u00fcn daha fazla insan ve i\u015fletme bulut sistemlerini kullan\u0131yor ve bir \u00e7ok ki\u015fi g\u00fcvenlik yaz\u0131l\u0131mlar\u0131n\u0131n %100 bir g\u00fcvenlik sa\u011flayaca\u011f\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcyor. Baz\u0131 noktalardan bak\u0131ld\u0131\u011f\u0131nda b\u00f6yle g\u00f6z\u00fckebilir ancak b\u00fcy\u00fck resime bak\u0131ld\u0131\u011f\u0131nda asl\u0131nda durum hi\u00e7 \u00f6yle de\u011fil. S\u00f6z konusu siber […]<\/p>\n","protected":false},"author":60,"featured_media":5036,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"acf":[],"yoast_head":"\nFirewall Nedir? 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