{"id":1987,"date":"2022-03-21T12:40:00","date_gmt":"2022-03-21T09:40:00","guid":{"rendered":"https:\/\/www.niobehosting.com\/blog\/?p=1987"},"modified":"2022-04-08T14:54:45","modified_gmt":"2022-04-08T11:54:45","slug":"firewall","status":"publish","type":"post","link":"https:\/\/www.niobehosting.com\/blog\/firewall\/","title":{"rendered":"Firewall Nedir? Nas\u0131l \u00c7al\u0131\u015f\u0131r?"},"content":{"rendered":"\n<p>Bu yaz\u0131m\u0131z\u0131 okumay\u0131 bitirdi\u011finizde; \u201cfirewall nedir?\u201d, \u201cfirewall ne i\u015fe yarar\u201d ve \u201cfirewall \u00e7al\u0131\u015fma mant\u0131\u011f\u0131 nedir?\u201d gibi sorulara en anla\u015f\u0131labilir \u015fekilde verilen cevaplar\u0131 bulabileceksiniz. Teknik detaylara bo\u011fulmadan, ger\u00e7ek ya\u015famdan \u00f6rneklerle, basitle\u015ftirerek anlat\u0131m yapt\u0131\u011f\u0131m\u0131z firewall teknolojisini anlamak i\u00e7in yaz\u0131m\u0131z\u0131 okumaya ba\u015flayabilirsiniz.<\/p>\n\n\n\n<p>Firewall terimi dilimizde \u201cg\u00fcvenlik duvar\u0131\u201d anlam\u0131na\ngelmektedir. <strong>Temel amac\u0131 a\u011f\u0131n\u0131zdaki\ngelen trafik ile giden trafi\u011fi kontrol etmek ve \u00f6nceden belirlenmi\u015f iletim\nkurallar\u0131 \u00e7er\u00e7evesinde trafi\u011fi ilgili yere y\u00f6nlendirmektir.<\/strong><\/p>\n\n\n\n<p>Firewall yaz\u0131l\u0131m\u0131nda; tehdit olarak alg\u0131lanacak dosya ve\ndavran\u0131\u015flar ile g\u00fcvenli say\u0131lacak dosya ve davran\u0131\u015flar \u00f6nceden kurallar\nbi\u00e7iminde saptan\u0131r. Bu kurallara uyan her t\u00fcrl\u00fc eyleme otomatik olarak izin\nverilir. Kural d\u0131\u015f\u0131 hareketler ise a\u011f y\u00f6neticisinin istisna olarak tan\u0131mlamas\u0131\ndurumunda a\u011fa kabul edilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Firewall Nas\u0131l\n\u00c7al\u0131\u015f\u0131r?<\/strong><\/h2>\n\n\n\n<p><strong>Firewall \u00e7al\u0131\u015fma\nmant\u0131\u011f\u0131 olduk\u00e7a basittir. A\u011f y\u00f6neticisi taraf\u0131ndan olu\u015fturulan \u201cg\u00fcvenli liste\u201d\ni\u00e7erisindeki t\u00fcm trafik, herhangi bir engele maruz kalmadan a\u011f\u0131n\u0131za iletilir.\nG\u00fcvenli listede olmayan trafik ise bloke edilerek a\u011f\u0131n\u0131za eri\u015fmesi engellenir\nve taraf\u0131n\u0131za bilgi verilir.<\/strong><\/p>\n\n\n\n<p>Ger\u00e7ek ya\u015famdan bir \u00f6rnek vermek gerekirse; b\u00fcy\u00fck ve g\u00fcvenlik\nbankosu, turnikesi olan bir plazaya plaza \u00e7al\u0131\u015fanlar\u0131; firma kartlar\u0131n\u0131\nokutarak turnikelerden sorunsuz bir bi\u00e7imde ge\u00e7erek girer. \u0130\u015fte bu firewall\ntaraf\u0131ndan tan\u0131nan g\u00fcvenli listedir. Fakat plazada \u00e7al\u0131\u015fan herhangi bir ki\u015fi\nile g\u00f6r\u00fc\u015fmek isteyen ziyaret\u00e7i; \u00f6nce g\u00fcvenlik bankosuna u\u011framak ve kiminle\ng\u00f6r\u00fc\u015fmek istedi\u011fini s\u00f6ylemek zorundad\u0131r. \u0130\u015fte bu da firewall taraf\u0131ndan eri\u015fime\nizin verilmeyen \u015f\u00fcpheli trafiktir. G\u00fcvenlik ilgili ki\u015fiyi arar ve ziyaret\u00e7isi\noldu\u011funu s\u00f6yler, e\u011fer ilgili ki\u015fi ziyaret\u00e7iye izin verirse g\u00fcvenlik (yani\nfirewall) ziyaret\u00e7inin binaya girmesine izin verir. Bazen de plazadaki\ny\u00f6neticilerden biri \u201cx isimli ki\u015fi gelirse bekletmeden yukar\u0131 al\u0131n\u201d der. Tahmin\nedece\u011finiz gibi bu durum da a\u011f y\u00f6neticisinin g\u00fcvenli listeye yeni bir trafik\neklemesidir.<\/p>\n\n\n\n<p>Baz\u0131 firewall yaz\u0131l\u0131mlar\u0131 veya firewall cihazlar\u0131 bazen bir\nProxy sunucusu ile birlikte \u00e7al\u0131\u015f\u0131rlar. E\u011fer \u201cProxy firewall\u201d kullan\u0131yorsan\u0131z;\ngelen ve giden trafi\u011finiz hedefe iletilmeden \u00f6nce bir Proxy sunucusunda kontrol\nedilir. Yukar\u0131daki plaza \u00f6rne\u011finden devam edersek; bu Proxy sunucusunu da\ng\u00fcvenlik bankosundan ge\u00e7meden evvel kontrol edildi\u011finiz x-ray cihaz\u0131 olarak\ntan\u0131mlayabiliriz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Firewall T\u00fcrleri ve\n\u00c7e\u015fitleri Nelerdir?<\/strong><\/h2>\n\n\n\n<p>Firewall teknolojisini en sade \u015fekilde anlatmak ad\u0131na;\n\u201cyap\u0131lar\u0131na g\u00f6re firewall t\u00fcrleri\u201d ve \u201cmimarisine g\u00f6re firewall t\u00fcrleri\u201d olarak\nikiye ay\u0131rabiliriz. <\/p>\n\n\n\n<p>Yap\u0131lar\u0131na g\u00f6re firewall \u00e7e\u015fitleri de kendi aralar\u0131nda ikiye\nayr\u0131l\u0131rlar. Bunlar;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u201cdonan\u0131msal firewall\u201d (donan\u0131m tabanl\u0131 firewall)\n<\/li><li>&nbsp;\u201cyaz\u0131l\u0131msal firewall\u201d (yaz\u0131l\u0131m tabanl\u0131 firewall)\n<\/li><\/ol>\n\n\n\n<p>\u015feklinde s\u0131n\u0131fland\u0131r\u0131l\u0131r.<\/p>\n\n\n\n<p>\u201cMimarisine g\u00f6re firewall\u201d \u00fcr\u00fcnleri ise kendi aras\u0131nda be\u015f\nk\u0131sma ayr\u0131l\u0131r. Bu s\u0131n\u0131flar ise;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Statik Paket Filtre G\u00fcvenlik Duvarlar\u0131<\/li><li>Devre Seviyesi G\u00fcvenlik Duvarlar\u0131<\/li><li>Dinamik Paket (Durum Denetimli) Filtre G\u00fcvenlik\nDuvarlar\u0131<\/li><li>Proxy Destekli G\u00fcvenlik Duvarlar\u0131<\/li><li>Hibrit (Melez) G\u00fcvenlik Duvarlar\u0131<\/li><\/ol>\n\n\n\n<p>\u015feklindedir.<\/p>\n\n\n\n<p>\u015eimdi bu ba\u015fl\u0131klar\u0131 m\u00fcmk\u00fcn olabilecek en sade \u015fekilde\na\u00e7\u0131klamaya \u00e7al\u0131\u015fal\u0131m.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Yap\u0131lar\u0131na G\u00f6re G\u00fcvenlik\nDuvar\u0131 \u00dcr\u00fcnleri<\/strong><\/h2>\n\n\n\n<p>G\u00fcvenlik duvar\u0131 \u00fcr\u00fcnleri yap\u0131lar\u0131na g\u00f6re incelenirken temel iki\nguruba ayr\u0131l\u0131r. Her yap\u0131da mutlaka bir g\u00fcvenlik duvar\u0131 yaz\u0131l\u0131m\u0131 s\u00f6z konusudur.\nAncak bazen bu g\u00fcvenlik duvar\u0131 harici bir cihaz \u00fczerine kurularak kullan\u0131l\u0131r.\nYap\u0131lar\u0131na g\u00f6re ikiye ay\u0131rd\u0131\u011f\u0131m\u0131z bu \u00fcr\u00fcnleri anlatmaya devam edelim.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Donan\u0131msal G\u00fcvenlik\nDuvarlar\u0131 (Donan\u0131msal Firewall \u2013 Donan\u0131m Tabanl\u0131 Firewall)<\/strong><\/h3>\n\n\n\n<p>A\u011f\u0131n\u0131z\u0131n g\u00fcvenli\u011fini sa\u011flayacak olan g\u00fcvenlik duvar\u0131\nyaz\u0131l\u0131m\u0131n\u0131n; bilgisayar\u0131n\u0131zdan ve router\u0131n\u0131zdan ba\u011f\u0131ms\u0131z bir cihaza y\u00fcklenerek\nkullan\u0131lmas\u0131 \u015feklinde a\u00e7\u0131klayaca\u011f\u0131m\u0131z bir g\u00fcvenlik duvar\u0131 \u00e7e\u015fididir. \u0130nternet\na\u011f\u0131n\u0131za gelen trafi\u011fi \u00f6nce denetler ve kurallara uygunsa a\u011f\u0131n\u0131za iletir.\n\u00c7al\u0131\u015fma mant\u0131\u011f\u0131 paket filtreleme \u015feklindedir.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Donan\u0131m Tabanl\u0131\nFirewall Avantajlar\u0131<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>Yaz\u0131l\u0131m tabanl\u0131 firewall gibi kolayca devreden\n\u00e7\u0131kar\u0131lamazlar<\/li><li>Ayr\u0131 bir cihaz olarak kullan\u0131ld\u0131\u011f\u0131 i\u00e7in\nsisteminizdeki kaynaklar\u0131 t\u00fcketmezler<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Donan\u0131m Tabanl\u0131\nFirewall Dezavantajlar\u0131<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>Baz\u0131 cihazlar\u0131n ara y\u00fcz\u00fc karma\u015f\u0131k\nolabilece\u011finden ayarlar\u0131n\u0131 yapmak uzmanl\u0131k gerektirebilir<\/li><li>Yaz\u0131l\u0131m tabanl\u0131 g\u00fcvenlik duvar\u0131 \u00fcr\u00fcnlerine g\u00f6re\nyat\u0131r\u0131m maliyeti daha fazla olabilir<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Yaz\u0131l\u0131msal G\u00fcvenlik\nDuvar\u0131<\/strong> <strong>(Yaz\u0131l\u0131msal Firewall \u2013 Yaz\u0131l\u0131m\nTabanl\u0131 Firewall)<\/strong><\/h3>\n\n\n\n<p>Sistemdeki i\u015fletim sistemi \u00fczerine kurulan, ekstra bir\ndonan\u0131m gerektirmeyen g\u00fcvenlik duvar\u0131 \u00e7e\u015fididir. Bu \u00fcr\u00fcn\u00fcn avantajlar\u0131 ve\ndezavantajlar\u0131 ise a\u015fa\u011f\u0131daki gibidir.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Yaz\u0131l\u0131m Tabanl\u0131\nFirewall Avantajlar\u0131<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>Ekstra bir donan\u0131m maliyeti gerektirmedi\u011finden,\naz say\u0131da bilgisayar\u0131 korumak i\u00e7in fiyat y\u00f6n\u00fcnden daha avantajl\u0131d\u0131r.<\/li><li>Basit bir ara y\u00fcze sahiptir. Kullan\u0131c\u0131lar\ngenelde birka\u00e7 tu\u015flama ile g\u00fcvenli listeye trafik ekleyebilir veya kara listeye\nalabilir.<\/li><li>Giden trafi\u011finiz i\u00e7in de kural olu\u015fturmaya\nolanak sa\u011flayabilirler<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Yaz\u0131l\u0131m Tabanl\u0131\nFirewall Dezavantajlar\u0131<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>S\u00fcrekli arka planda (yani i\u015fletim sistemi\n\u00fczerinde) \u00e7al\u0131\u015faca\u011f\u0131 i\u00e7in sistem kaynaklar\u0131n\u0131 t\u00fcketirler.<\/li><li>Sistemdeki t\u00fcm kullan\u0131c\u0131lar taraf\u0131ndan devre\nd\u0131\u015f\u0131 b\u0131rak\u0131labilece\u011fi i\u00e7in bazen tam manas\u0131 ile g\u00fcvenlik sa\u011flayamayabilirler.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Mimarisine G\u00f6re G\u00fcvenlik Duvar\u0131 \u00dcr\u00fcnleri<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Statik Paket Filtre G\u00fcvenlik Duvarlar\u0131<\/strong><\/h3>\n\n\n\n<p>G\u00fcn\u00fcm\u00fczde \u00e7ok tercih edilmeyen\nbir g\u00fcvenlik duvar\u0131 sistemidir. A\u011f\u0131n\u0131za gelen trafi\u011fin temel bilgilerini\nde\u011ferlendirir, i\u00e7eri\u011fi ile ilgilenmez. Trafi\u011fin geldi\u011fi kaynak, ula\u015fmak\nistedi\u011fi kaynak, hangi porta eri\u015fmek istedi\u011fini ve hangi protokol\u00fc\nkullanaca\u011f\u0131n\u0131 denetler. E\u011fer g\u00fcvenli olan liste ile \u00f6rt\u00fc\u015f\u00fcyorsa trafi\u011fe izin\nverir.<\/p>\n\n\n\n<p>Halbuki, Yandex ve Google gibi\nd\u00fcnyan\u0131n en g\u00fcvenilir teknoloji \u015firketlerinin sunucular\u0131na bile; a\u011f\u0131n\u0131za zarar\nverecek yaz\u0131l\u0131mlar y\u00fcklenebilmektedir. Yani statik paket filtre g\u00fcvenlik\nduvar\u0131; a\u011f\u0131n\u0131za indirmeye \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131z bir dosyan\u0131n i\u00e7eri\u011fini kontrol\netmeyece\u011fi i\u00e7in, g\u00fcvenli sitelere y\u00fcklenebilmi\u015f bir vir\u00fcs yaz\u0131l\u0131m\u0131n\u0131 bilgisayar\u0131n\u0131za\nindirebilirsiniz.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Devre Seviyesi G\u00fcvenlik Duvarlar\u0131<\/strong><\/h3>\n\n\n\n<p>Yayg\u0131n kullan\u0131lan bir g\u00fcvenlik\nduvar\u0131 t\u00fcr\u00fcd\u00fcr. &nbsp;Bir binaya girmeye\n\u00e7al\u0131\u015fan ziyaret\u00e7iye direk kimlik soran g\u00fcvenlik g\u00f6revlisi olarak\nnitelendirebiliriz. Hatta bu g\u00fcvenlik g\u00f6revlisi; \u201cziyaret edilmek istenen\nki\u015finin hangi ofiste oldu\u011funu da g\u00fcvenlik kontrol\u00fc bitene kadar gizli tutmakta\u201d\ndesek tam anlam\u0131 ile anlatm\u0131\u015f olaca\u011f\u0131z.<\/p>\n\n\n\n<p>Yukar\u0131daki \u00f6rnekten de\nanla\u015f\u0131laca\u011f\u0131 \u00fczere; devre seviyesi g\u00fcvenlik duvarlar\u0131nda kayna\u011fa (yani gelen\ntrafi\u011fe) sizin ip adresiniz hemen iletilmez. \u00d6nce g\u00fcvenlik kontrol\u00fc yap\u0131l\u0131r,\ne\u011fer kaynaktan gelen trafik g\u00fcvenlik kontrol\u00fcnden ge\u00e7erse ip adresinize trafik\ny\u00f6nlendirilir.<\/p>\n\n\n\n<p><strong>Statik paket filtre g\u00fcvenlik duvar\u0131nda bulunan dezavantaj bu g\u00fcvenlik t\u00fcr\u00fcnde de bulunmaktad\u0131r. Devre seviyesi firewall yaz\u0131l\u0131mlar\u0131 da gelen trafikteki paketin i\u00e7eri\u011fini kontrol etmez. Yani binaya girmeye \u00e7al\u0131\u015fan ziyaret\u00e7iye kimlik kontrol\u00fc yap\u0131l\u0131r ama ziyaret\u00e7inin \u00fcst\u00fc aranmaz.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Dinamik Paket (Durum Denetimli) Filtre G\u00fcvenlik Duvarlar\u0131<\/strong><\/h3>\n\n\n\n<p>\u201cStatik paket filtre g\u00fcvenlik\nduvar\u0131\u201d yaz\u0131l\u0131mlar\u0131n\u0131n bir \u00fcst modeli olarak tan\u0131mlayabiliriz. Bu pakette\nbinaya gelen ziyaret\u00e7inin hem geldi\u011fi adres do\u011frulan\u0131r, hem kimli\u011fi sorulur,\nhem de \u00fcst aramas\u0131 yap\u0131l\u0131r.<\/p>\n\n\n\n<p>Teknik tabirle anlatmak\ngerekirse; a\u011f\u0131n\u0131za gelen verinin kayna\u011f\u0131, verinin i\u00e7eri\u011fi, eri\u015fmek istedi\u011fi\nport denetlenir ve veri hala g\u00fcvenli ise a\u011f\u0131n\u0131za ge\u00e7mesi izin verilir. Y\u00fcksek\nperformansl\u0131 \u00e7al\u0131\u015fmas\u0131 i\u00e7in de bu i\u015flem, trafik hemen a\u011f\u0131n\u0131za girmek isterken\nyap\u0131l\u0131r.<\/p>\n\n\n\n<p>Bu paketin en b\u00fcy\u00fck avantaj\u0131 port\nsorgulama sistemidir. Bunu ger\u00e7ek hayata uyarlayarak a\u00e7\u0131klayal\u0131m. Diyelim ki\nbirisi binan\u0131za yang\u0131n merdivenini kullanarak girmek istedi. Bu normal bir\ngiri\u015f te\u015febb\u00fcs\u00fc olmad\u0131\u011f\u0131 i\u00e7in g\u00fcvenlik g\u00f6revlisi hemen bu ki\u015fiyi yakalar ve\nsize haber verir. E\u011fer siz \u201cevet haberim var, girmesine m\u00fcsaade ediyorum\u201d\nderseniz bu ge\u00e7i\u015fe izin verir. \u0130\u015fte \u201cport sorgulama sistemi\u201d, yang\u0131n\nmerdiveninden giri\u015f yapmaya \u00e7al\u0131\u015fan ki\u015fiyi yakalayan g\u00fcvenlik g\u00f6revlisidir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Proxy Destekli G\u00fcvenlik Duvarlar\u0131<\/strong><\/h3>\n\n\n\n<p>Hadi \u201cProxy destekli g\u00fcvenlik\nduvar\u0131\u201d isimli yaz\u0131l\u0131m\u0131 da yukar\u0131daki \u00f6rneklere benzer bi\u00e7imde anlatal\u0131m. Asl\u0131nda\nbu yaz\u0131l\u0131m da \u201cdinamik paket filtre g\u00fcvenlik duvar\u0131\u201d mant\u0131\u011f\u0131na yak\u0131n bir\nmant\u0131kla \u00e7al\u0131\u015f\u0131r. Ancak bu sistemde ziyaret\u00e7inin geldi\u011fi adresin do\u011frulanmas\u0131\ni\u00e7in g\u00fcvenlik g\u00f6revlisi bizzat ziyaret\u00e7inin geldi\u011fi yere gider, ziyaret\u00e7iyi\nadresinden al\u0131r, sizin binan\u0131za geldi\u011finde d\u0131\u015far\u0131da durdurur, kimli\u011fini kontrol\neder, \u00fczerini arar ve binaya giri\u015fine izin verir. Bu kadar detayl\u0131 bir g\u00fcvenlik\ntaramas\u0131 yapt\u0131\u011f\u0131 i\u00e7in de do\u011fal olarak ziyaret\u00e7inin binaya girmesi daha uzun\nzaman al\u0131r ve yo\u011fun bir ziyaret\u00e7i trafi\u011finde kullan\u0131lamaz.<\/p>\n\n\n\n<p>Teknik tabirle anlatmak\ngerekirse; a\u011f\u0131n\u0131za girmek isteyen trafi\u011fin kayna\u011f\u0131na bir oturum a\u00e7ma talebi\ng\u00f6nderilir, bu talebe cevap veren kaynak a\u011f\u0131n d\u0131\u015f\u0131nda incelenir, uygun\nbulunmas\u0131 hallinde a\u011f ge\u00e7i\u015fine izin verilir. Yani verinin kaynak adresi\ndo\u011frulamas\u0131 bizzat kaynak adresinde ger\u00e7ekle\u015ftirilir, g\u00fcvenlik kontrol\u00fc ise\na\u011f\u0131n\u0131z\u0131n d\u0131\u015f\u0131nda yap\u0131l\u0131r. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Hibrit (Melez) G\u00fcvenlik Duvarlar\u0131<\/strong><\/h3>\n\n\n\n<p>Buraya kadar mimarisine g\u00f6re d\u00f6rt\ngurupta s\u0131n\u0131fland\u0131rd\u0131\u011f\u0131m\u0131z g\u00fcvenlik duvar\u0131 teknolojilerinin en az iki tanesini\nyap\u0131s\u0131nda bar\u0131nd\u0131ran g\u00fcvenlik duvar\u0131 mimarisine \u201chibrit g\u00fcvenlik duvar\u0131\u201d veya\n\u201cmelez g\u00fcvenlik duvar\u0131\u201d denir. Bir hibrit g\u00fcvenlik duvar\u0131 yaz\u0131l\u0131m\u0131nda y\u00fcksek\nihtimalle Proxy teknolojisi bar\u0131nd\u0131r\u0131l\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Firewall Neden\nGereklidir?<\/strong><\/h2>\n\n\n\n<p><strong>Her \u015feyden evvel firewall,\nizinsiz uzaktan eri\u015fime kar\u015f\u0131 sizi korur. Sizin haberiniz olmadan herhangi bir\ny\u00f6ntemle a\u011f\u0131n\u0131za girmeye \u00e7al\u0131\u015fan yetkisiz ki\u015filer; g\u00fcvenlik duvar\u0131 taraf\u0131ndan\nbelirlenir ve bu giri\u015fler engellenir.<\/strong> Dolay\u0131s\u0131 ile a\u011f\u0131n\u0131za girmeye \u00e7al\u0131\u015fan\nanonim ki\u015filere kar\u015f\u0131 alabilece\u011finiz en kesin g\u00fcvenlik \u00f6nlemlerinden biridir.<\/p>\n\n\n\n<p>\u00d6zellikle y\u00fcksek say\u0131da personel istihdam eden, i\u00e7 ve d\u0131\u015f\nhaberle\u015fmesinin b\u00fcy\u00fck bir b\u00f6l\u00fcm\u00fcn\u00fc elektronik posta ile \u00e7\u00f6zen firmalarda;\ne-posta trafi\u011fini denetlemek ve e-posta ile a\u011f\u0131n\u0131za s\u0131zabilecek zararl\u0131\nyaz\u0131l\u0131mlardan korunmak olduk\u00e7a zordur<strong>.\nG\u00fcvenlik duvar\u0131 yaz\u0131l\u0131mlar\u0131; elektronik postalardan gelecek vir\u00fcsleri a\u011f\u0131n\u0131za\ngirmeden engelleyece\u011fi gibi , istenmeyen i\u00e7erikleri bar\u0131nd\u0131ran spam mesajlar engellenir\nve<\/strong> <strong>daha g\u00fcvenli bir mail trafi\u011fi\nsa\u011flan\u0131r.<\/strong><\/p>\n\n\n\n<p>\u00d6zellikle oyun sunucular\u0131 vir\u00fcslerin ve k\u00f6t\u00fc ama\u00e7l\u0131\nyaz\u0131l\u0131mlar\u0131n da\u011f\u0131t\u0131m merkezidir. Bir\u00e7ok vir\u00fcs bilgisayar\u0131n\u0131za oyun sitelerinden\nbula\u015f\u0131r. \u00d6zellikle bilin\u00e7siz internet kullan\u0131c\u0131lar\u0131 taraf\u0131ndan bu vir\u00fcsler;\noyunun bir par\u00e7as\u0131 zannederek bilgisayar\u0131na indirebilece\u011finden dolay\u0131, internet\n\u00fczerinde oynanan online oyunlar firewall ile daha g\u00fcvenli hale gelir. <\/p>\n\n\n\n<p>Personelinizin veya aile fertlerinizin istemedi\u011finiz\nsiteleri gezmesini istemiyor iseniz, kesinlikle g\u00fcvenlik duvar\u0131 yaz\u0131l\u0131m\u0131\nkullanmal\u0131s\u0131n\u0131z. Firewall ile uygunsuz i\u00e7erikleri engelleyin ve a\u011f\u0131n\u0131zdaki\nki\u015filerin internetten amac\u0131 do\u011frultusunda faydalanmas\u0131n\u0131 sa\u011flay\u0131n.<\/p>\n\n\n\n<p>\u00d6zetlemek gerekirse; firewall ile a\u011f trafi\u011fini y\u00f6netmek ve\nkontrol etmek m\u00fcmk\u00fcnd\u00fcr. \u0130ster i\u015fyerinizde, ister evinizde; a\u011f\u0131n\u0131za kimin nas\u0131l\ngirmesi gerekti\u011fini bir kurallar b\u00fct\u00fcn\u00fc haline getirebilirsiniz. Diledi\u011finiz\nzaman bu kurallar\u0131 esnetebilir ya da daha kat\u0131 uygulayabilirsiniz.<\/p>\n\n\n\n<p>Ayr\u0131ca;&nbsp; 5651 say\u0131\nnumaral\u0131 \u201c\u0130nternet Ortam\u0131nda Yap\u0131lan Yay\u0131nlar\u0131n D\u00fczenlenmesi ve Bu Yay\u0131nlar\nYoluyla \u0130\u015flenen Su\u00e7larla M\u00fccadele Edilmesi Hakk\u0131nda Kanun\u201d kapsam\u0131nda ki\nsorumlulu\u011funuzu da g\u00fcvenlik duvar\u0131 yaz\u0131l\u0131m\u0131 sayesinde yerine getirebilirsiniz.\nS\u00f6z konusu kanunda; <strong>\u201csahibi oldu\u011funuz ya\nda y\u00f6netti\u011finiz a\u011fdaki olaylar\u0131 kaydedin ve raporlay\u0131n\u201d <\/strong>anlam\u0131na gelen\nkanuni bir zorunluluktan bahsedilmektedir. Bir \u00e7al\u0131\u015fan\u0131n\u0131z\u0131n ya da a\u011f\u0131n\u0131za\ndavetsiz ba\u011flanan k\u00f6t\u00fc niyetli birinin i\u015fleyece\u011fi siber su\u00e7lardan kendinizi\nkoruman\u0131z i\u00e7in mutlaka g\u00fcvenlik duvar\u0131 \u00fcr\u00fcnlerinden faydalanmal\u0131s\u0131n\u0131z.<\/p>\n\n\n\n<p>Bu yaz\u0131m\u0131zda size firewall teknolojisinin i\u00e7eri\u011fini ve \u00e7al\u0131\u015fma mant\u0131\u011f\u0131n\u0131 m\u00fcmk\u00fcn olan en k\u0131sa \u015fekilde anlatmaya \u00e7al\u0131\u015ft\u0131k. Sitemizde gezinmeye devam ederek internet teknolojileri hakk\u0131nda farkl\u0131 bilgiler edinebilirsiniz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130\u015fletmelerin Siber Tehditlere Kar\u015f\u0131 \u00c7\u00f6z\u00fcm\u00fc: Berqnet<\/h2>\n\n\n\n<p>Teknolojideki yeni geli\u015fmeler ve i\u015fletmelerin i\u015f s\u00fcre\u00e7lerini dijital ortama ta\u015f\u0131mas\u0131, siber g\u00fcvenlik ihtiyac\u0131n\u0131 da beraberinde getirir. \u015eirketlere dair \u00f6nemli bilgilerin dijital ortamda saklanmas\u0131, i\u015fletmelerin farkl\u0131 \u015fubeleri ile dijital ortamda ba\u011flant\u0131 kurma ihtiyac\u0131 gibi pek \u00e7ok etken, veri g\u00fcvenli\u011fini tehlikeye sokan unsurlard\u0131r. Bu sebeple, i\u015fletmeler i\u00e7in siber g\u00fcvenlik duvar\u0131, yani Firewall sistemleri ile verilerinizin g\u00fcvende kalmas\u0131 ama\u00e7lan\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Berqnet Nedir?<\/h3>\n\n\n\n<p><strong>Berqnet<\/strong>, kurmas\u0131 ve y\u00f6netmesi olduk\u00e7a kolay olan bir Firewall cihaz\u0131d\u0131r. 2013 y\u0131l\u0131ndan bu yana varl\u0131\u011f\u0131n\u0131 s\u00fcrd\u00fcren Logo Siber G\u00fcvenlik, Berqnet markas\u0131n\u0131 tamamen yerli bir AR-GE ekibiyle geli\u015ftirmi\u015ftir. <a href=\"https:\/\/berqnet.com\/\">Berqnet Firewall cihazlar\u0131<\/a>, tamamen i\u015fletmelerin siber g\u00fcvenlik ihtiya\u00e7lar\u0131na cevap vermek \u00fczere geli\u015ftirilir. Ayn\u0131 zamanda internet y\u00f6netimi ve yasalara uygun olup olmad\u0131\u011f\u0131n\u0131n denetimini de yapar.<\/p>\n\n\n\n<p><strong>Berqnet<\/strong>, ba\u015far\u0131l\u0131 Firewall cihazlar\u0131yla T\u00fcrk Elektronik Sanayicileri Derne\u011fi (TESAD) taraf\u0131ndan Yenilik\u00e7i \u00dcr\u00fcn \u00d6d\u00fcl\u00fcne; BTVizyon taraf\u0131ndan ise y\u0131l\u0131n en iyi yerli g\u00fcvenlik yaz\u0131l\u0131m\u0131 unvan\u0131na lay\u0131k g\u00f6r\u00fclm\u00fc\u015ft\u00fcr. Ba\u011f\u0131ms\u0131z g\u00fcvenlik analiz firmas\u0131 Corvues Bili\u015fim, Berqnet\u2019i whitebox, graybox, tarama, blackbox derin tarama y\u00f6ntemlerini kullanarak test etmi\u015ftir. Bu analizlerin sonucunda marka ba\u015far\u0131s\u0131yla g\u00fcvenlik alan\u0131nda kendini kan\u0131tlam\u0131\u015ft\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Berqnet Firewall Sistemlerinin \u00d6zellikleri Nelerdir?<\/h2>\n\n\n\n<p>Berqnet, geni\u015f teknik \u00f6zellikleri sayesinde i\u015fletmelerin ihtiya\u00e7 duydu\u011fu veri g\u00fcvenli\u011fi ihtiyac\u0131na kapsaml\u0131 \u00e7\u00f6z\u00fcmler sunar. Markan\u0131n Firewall cihaz\u0131na dair teknik \u00f6zellikleri \u015funlard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Firewall (G\u00fcvenlik Duvar\u0131)<\/li><li>IDS\/IPS (Sald\u0131r\u0131 Tespit ve Engelleme Sistemi)<\/li><li>WAN Y\u00f6netimi<\/li><li>A\u011f Y\u00f6netimi<\/li><li>Antivir\u00fcs<\/li><li>Hotspot<\/li><li>Web Filtre<\/li><li>Kullan\u0131c\u0131 Yetkilendirme<\/li><li>Uygulama Filtre<\/li><li>Kay\u0131tlar ve Raporlama<\/li><li>IPsec VPN<\/li><li>SSL VPN<\/li><li>Sistem Y\u00f6netimi<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Neden Berqnet\u2019i Tercih Etmelisiniz?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/berqnet.com\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"536\" src=\"https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall-1024x536.jpg\" alt=\"\" class=\"wp-image-6953\" srcset=\"https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall-1024x536.jpg 1024w, https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall-300x157.jpg 300w, https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall-768x402.jpg 768w, https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall-100x52.jpg 100w, https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall-700x366.jpg 700w, https:\/\/www.niobehosting.com\/blog\/wp-content\/uploads\/berqnet-firewall.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>Berqnet ile veri g\u00fcvenli\u011fini sa\u011flamak i\u00e7in pek \u00e7ok \u00f6nemli neden vard\u0131r. Bu nedenler a\u015fa\u011f\u0131daki gibidir:<\/p>\n\n\n\n<p><strong>Kolay kurulum ve y\u00f6netim avantaj\u0131:<\/strong>\u00a0Berqnet sayesinde yaln\u0131zca birka\u00e7 dakika i\u00e7inde kurulumu yapman\u0131z m\u00fcmk\u00fcn olur. Bu sistemi y\u00f6netmeniz, sade aray\u00fcz\u00fc sayesinde olduk\u00e7a kolayd\u0131r. Berqnet ile Firewall \u00fcr\u00fcnlerini hem kurmak\u00a0hem y\u00f6netmek i\u00e7in buna \u00f6zel uzmanl\u0131\u011fa ihtiya\u00e7 duymazs\u0131n\u0131z.<\/p>\n\n\n\n<p><strong>Olas\u0131 siber tehditler i\u00e7in etkin koruma:<\/strong>&nbsp;\u0130leri seviyede siber koruma \u00f6zelli\u011fi ile Berqnet, i\u015fletmenizi olas\u0131 t\u00fcm siber sald\u0131r\u0131lara kar\u015f\u0131 korur. B\u00f6ylece verilerinizin \u00e7al\u0131nmas\u0131, sisteminizin bloke olmas\u0131 gibi olumsuzluklar\u0131n \u00f6n\u00fcne ge\u00e7mi\u015f olursunuz.<\/p>\n\n\n\n<p><strong>Misafirleriniz i\u00e7in g\u00fcvenli bir internet ba\u011flant\u0131s\u0131 (Hotspot):<\/strong>&nbsp;Berqnet\u2019in Hotspot \u00f6zelli\u011fi sayesinde yaln\u0131zca yetki verdi\u011finiz ki\u015filer, i\u015fletmenizin internet a\u011f\u0131na ba\u011flanabilir. Bu ba\u011flant\u0131 sonucu olu\u015fan t\u00fcm kay\u0131tlar ise yasalara uygun \u015fekilde kay\u0131t alt\u0131na al\u0131n\u0131r. T.C. Kimlik Numaras\u0131, SMS \u015fifresi gibi y\u00f6ntemler ile yetkilendirme ve otel yaz\u0131l\u0131mlar\u0131na entegrasyon imkanlar\u0131na sahip olabilirsiniz.<\/p>\n\n\n\n<p><strong>VPN ile g\u00fcvenli uzak ba\u011flant\u0131:<\/strong>&nbsp;Birden fazla \u015fubesi olan bir i\u015fletmeniz varsa, t\u00fcm \u015fube \u00e7al\u0131\u015fanlar\u0131n\u0131n kurum a\u011f\u0131na g\u00fcvenli bir \u015fekilde ba\u011flanmas\u0131n\u0131 sa\u011flayabilirsiniz. Berqnet ile IPSec VPN kullanarak \u015fubeler aras\u0131 veri g\u00fcvenli\u011fini; SSL VPN kullanarak ise ofis d\u0131\u015f\u0131ndaki \u00e7al\u0131\u015fanlar\u0131n ofis a\u011f\u0131na g\u00fcvenle ba\u011flanmalar\u0131n\u0131 sa\u011flayabilirsiniz. Ayr\u0131ca, Berqnet\u2019in sundu\u011fu SASE (Secure Access Service Edge) Platformu\u2019nu kullanarak i\u015fletmenize ait \u015fube ve merkezlerin bulut \u00fczerinden tek platform ile a\u011f ve g\u00fcvenlik s\u00fcrecinin y\u00f6netilmesini sa\u011flayabilirsiniz.<\/p>\n\n\n\n<p><strong>T\u00fcrk Liras\u0131 \u00fczerinden fiyatland\u0131rma: <\/strong>Berqnet, yerli sermaye ve AR-GE ile geli\u015ftirildi\u011finden&nbsp;sat\u0131\u015f fiyatlar\u0131 da T\u00fcrk Liras\u0131 \u00fczerinden belirlenir. B\u00f6ylece kur dalgalanmalar\u0131ndan etkilenmeden&nbsp;siber g\u00fcvenlik sisteminizi kurabilirsiniz.<\/p>\n\n\n\n<p><strong>Yasalara uyumluluk:<\/strong>&nbsp;Berqnet ile kuraca\u011f\u0131n\u0131z g\u00fcvenlik duvar\u0131 KVKK ve 5651 say\u0131l\u0131 yasalara uygundur.<\/p>\n\n\n\n<p><strong>Mobil raporlama imkan\u0131:<\/strong>&nbsp;Berqnet Firewall ile temel bilgilere mobil cihazlar\u0131n\u0131z \u00fczerinden de eri\u015febilirsiniz. Bunun i\u00e7in cihaz\u0131n\u0131za Firewall rapor uygulamas\u0131n\u0131 indirmeniz yeterlidir. Mobil uygulama sayesinde tan\u0131ml\u0131 cihazlarda olu\u015fturulan uyar\u0131lardan an\u0131nda haberdar olabilir, Firewall cihaz\u0131n\u0131 uygulamayla yeniden ba\u015flatabilirsiniz.<\/p>\n\n\n\n<p><strong>Web ve uygulamalarda filtreleme:<\/strong>&nbsp;\u0130\u015fletme i\u00e7inde \u00e7al\u0131\u015fanlar\u0131n i\u015f d\u0131\u015f\u0131nda bir sebep ile internet kullan\u0131m\u0131n\u0131 \u00f6nlemek ya da k\u0131s\u0131tlamak i\u00e7in filtreleme yapabilirsiniz. Bu filtrelemeyle internet eri\u015fimini kurallara ba\u011flayabilir ya da istenmeyen sitelerin eri\u015fimini tamamen engelleyebilirsiniz.<\/p>\n\n\n\n<p><strong>Tamamen yerli AR-GE:<\/strong>&nbsp;Logo Teknoloji ve Yat\u0131r\u0131m Holding A.\u015e. taraf\u0131ndan kurulan Logo Siber G\u00fcvenlik ve A\u011f Teknolojileri A.\u015e.\u2019nin sundu\u011fu Berqnet, farkl\u0131 \u00f6l\u00e7ekteki i\u015fletmelerin ihtiya\u00e7lar\u0131na \u00e7\u00f6z\u00fcm sunar. Bu \u00e7\u00f6z\u00fcmleri ise yerli AR-Ge ekibiyle geli\u015ftirir. Kendisinin de i\u00e7inde bulundu\u011fu pazar\u0131n ihtiya\u00e7lar\u0131n\u0131 takip ederek bu ihtiya\u00e7lara uygun \u00e7\u00f6z\u00fcmler \u00fcretmeyi hedefler.<\/p>\n\n\n\n<p>Siz de i\u015fletmenizin siber g\u00fcvenlik ihtiya\u00e7lar\u0131n\u0131 yasalarla uyumlu ve en g\u00fcvenli \u015fekilde y\u00f6netmek i\u00e7in Berqnet Firewall \u00fcr\u00fcnlerini tercih edebilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bu yaz\u0131m\u0131z\u0131 okumay\u0131 bitirdi\u011finizde; \u201cfirewall nedir?\u201d, \u201cfirewall ne i\u015fe yarar\u201d ve \u201cfirewall \u00e7al\u0131\u015fma mant\u0131\u011f\u0131 nedir?\u201d gibi sorulara en anla\u015f\u0131labilir \u015fekilde verilen cevaplar\u0131 bulabileceksiniz. Teknik detaylara&#8230;<\/p>\n","protected":false},"author":8,"featured_media":2026,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-1987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guvenlik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Firewall (G\u00fcvenlik Duvar\u0131) Nedir, Nas\u0131l \u00c7al\u0131\u015f\u0131r, Ne \u0130\u015fe Yarar? - Niobe Hosting<\/title>\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.niobehosting.com\/blog\/firewall\/\" \/>\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, Nas\u0131l \u00c7al\u0131\u015f\u0131r, Ne \u0130\u015fe Yarar? - Niobe Hosting\" \/>\n<meta property=\"og:description\" content=\"Bu yaz\u0131m\u0131z\u0131 okumay\u0131 bitirdi\u011finizde; \u201cfirewall nedir?\u201d, \u201cfirewall ne i\u015fe yarar\u201d ve \u201cfirewall \u00e7al\u0131\u015fma mant\u0131\u011f\u0131 nedir?\u201d gibi sorulara en anla\u015f\u0131labilir \u015fekilde verilen cevaplar\u0131 bulabileceksiniz. 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