{"id":36826,"date":"2025-12-23T17:40:58","date_gmt":"2025-12-23T14:40:58","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=36826"},"modified":"2025-12-23T17:40:58","modified_gmt":"2025-12-23T14:40:58","slug":"3-yontemle-debian-8-uzerinde-openvpn-ile-guvenli-internet-gezinmesi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/3-yontemle-debian-8-uzerinde-openvpn-ile-guvenli-internet-gezinmesi\/","title":{"rendered":"3 Y\u00f6ntemle Debian 8 \u00dczerinde OpenVPN ile G\u00fcvenli \u0130nternet Gezinmesi"},"content":{"rendered":"

<\/p>\n

3 Y\u00f6ntemle Debian 8 \u00dczerinde OpenVPN ile G\u00fcvenli \u0130nternet Gezinmesi<\/h2>\n

\u0130nternet \u00e7a\u011f\u0131nda gizlilik ve g\u00fcvenlik, her zamankinden daha kritik hale gelmi\u015ftir. \u0130nternet servis sa\u011flay\u0131c\u0131lar\u0131 (\u0130SS’ler), devlet kurumlar\u0131 ve siber su\u00e7lular, \u00e7evrimi\u00e7i aktivitelerimizi s\u00fcrekli olarak izlemekte, veri toplamaya \u00e7al\u0131\u015fmakta ve potansiyel g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 hedeflemektedir. Bu tehditlere kar\u015f\u0131 koyman\u0131n en etkili yollar\u0131ndan biri, sanal \u00f6zel a\u011flar (VPN’ler) kullanmakt\u0131r. VPN’ler, internet trafi\u011finizi \u015fifreleyerek ve bir VPN sunucusu \u00fczerinden y\u00f6nlendirerek \u00e7evrimi\u00e7i kimli\u011finizi ve verilerinizi korur. A\u00e7\u0131k kaynakl\u0131, g\u00fc\u00e7l\u00fc \u015fifreleme yeteneklerine sahip ve esnek bir VPN \u00e7\u00f6z\u00fcm\u00fc olan OpenVPN, \u00f6zellikle teknik kullan\u0131c\u0131lar aras\u0131nda pop\u00fcler bir tercihtir. Debian 8 (“Jessie”) gibi sa\u011flam ve g\u00fcvenilir bir Linux da\u011f\u0131t\u0131m\u0131 \u00fczerinde OpenVPN’i yap\u0131land\u0131rmak, hem ki\u015fisel gizlili\u011finizi korumak hem de g\u00fcvenli bir a\u011f ge\u00e7idi olu\u015fturmak i\u00e7in m\u00fckemmel bir temel sa\u011flar.<\/p>\n

Bu makalede, Debian 8 i\u015fletim sistemi \u00fczerinde OpenVPN kullanarak internette g\u00fcvenli bir \u015fekilde gezinmenin \u00fc\u00e7 farkl\u0131 y\u00f6ntemini detayl\u0131 bir \u015fekilde inceleyece\u011fiz. Bu y\u00f6ntemler, basit istemci ba\u011flant\u0131s\u0131ndan daha karma\u015f\u0131k a\u011f ge\u00e7idi kurulumlar\u0131na ve geli\u015fmi\u015f gizlilik katmanlar\u0131na kadar uzanmaktad\u0131r. Her bir y\u00f6ntemin kurulum ad\u0131mlar\u0131n\u0131, yap\u0131land\u0131rma detaylar\u0131n\u0131 ve kullan\u0131m senaryolar\u0131n\u0131 ele alarak, ihtiya\u00e7lar\u0131n\u0131za en uygun \u00e7\u00f6z\u00fcm\u00fc se\u00e7menize yard\u0131mc\u0131 olmay\u0131 ama\u00e7l\u0131yoruz.<\/p>\n

1. Y\u00f6ntem: Debian 8’i Do\u011frudan Bir OpenVPN \u0130stemcisi Olarak Kullanma<\/h3>\n

Bu y\u00f6ntem, Debian 8 makinenizin internet trafi\u011fini ticari bir VPN sa\u011flay\u0131c\u0131s\u0131n\u0131n veya kendi kurdu\u011funuz uzak bir OpenVPN sunucusunun a\u011f\u0131 \u00fczerinden y\u00f6nlendirmeyi i\u00e7erir. En basit ve en yayg\u0131n kullan\u0131lan y\u00f6ntemlerden biridir. Bu sayede, internete \u00e7\u0131k\u0131\u015f IP adresiniz VPN sunucusunun IP adresi olarak g\u00f6r\u00fcn\u00fcr ve trafi\u011finiz \u015fifrelenir.<\/p>\n

\u00d6n Ko\u015fullar<\/h4>\n

* Debian 8 (“Jessie”) kurulu bir sistem.
\n* \u0130nternet ba\u011flant\u0131s\u0131.
\n* Bir VPN sa\u011flay\u0131c\u0131s\u0131ndan veya kendi OpenVPN sunucunuzdan temin edilmi\u015f OpenVPN yap\u0131land\u0131rma dosyalar\u0131 (genellikle bir .ovpn<\/code> dosyas\u0131 ve ilgili sertifika\/anahtar dosyalar\u0131).<\/p>\n

Kurulum Ad\u0131mlar\u0131<\/h4>\n

1. OpenVPN Paketini Y\u00fckleme:<\/strong>
\n \u0130lk ad\u0131m olarak, Debian 8 sisteminizde OpenVPN istemcisini kurman\u0131z gerekir. Terminali a\u00e7\u0131n ve a\u015fa\u011f\u0131daki komutu \u00e7al\u0131\u015ft\u0131r\u0131n:<\/p>\n

sudo apt-get update\n    sudo apt-get install openvpn<\/code><\/pre>\n
    Bu komut, sistemdeki paket listesini g\u00fcnceller ve ard\u0131ndan OpenVPN istemci yaz\u0131l\u0131m\u0131n\u0131 y\u00fckler.<\/p>\n
2.  Yap\u0131land\u0131rma Dosyalar\u0131n\u0131 Haz\u0131rlama:<\/strong>
\n    VPN sa\u011flay\u0131c\u0131n\u0131z size genellikle bir .ovpn<\/code> uzant\u0131l\u0131 bir yap\u0131land\u0131rma dosyas\u0131 ve bazen ek olarak CA sertifikas\u0131 (ca.crt<\/code>), istemci sertifikas\u0131 (client.crt<\/code>) ve istemci anahtar\u0131 (client.key<\/code>) gibi dosyalar sa\u011flar. Bu dosyalar\u0131 Debian 8 makinenizde g\u00fcvenli bir yere kopyalay\u0131n, \u00f6rne\u011fin \/etc\/openvpn\/client\/<\/code> dizini alt\u0131na.<\/p>\n
    \u00d6rnek olarak, dosyalar\u0131n\u0131z\u0131n \/etc\/openvpn\/client\/myvpn.ovpn<\/code>, \/etc\/openvpn\/client\/ca.crt<\/code>, \/etc\/openvpn\/client\/client.crt<\/code>, \/etc\/openvpn\/client\/client.key<\/code> oldu\u011funu varsayal\u0131m. E\u011fer .ovpn<\/code> dosyas\u0131 t\u00fcm sertifikalar\u0131 ve anahtarlar\u0131 i\u00e7inde bar\u0131nd\u0131r\u0131yorsa (inline), sadece o dosyay\u0131 kopyalaman\u0131z yeterli olabilir.<\/p>\n
3.  OpenVPN Ba\u011flant\u0131s\u0131n\u0131 Ba\u015flatma:<\/strong>
\n    Yap\u0131land\u0131rma dosyalar\u0131n\u0131z haz\u0131r oldu\u011funda, OpenVPN ba\u011flant\u0131s\u0131n\u0131 ba\u015flatabilirsiniz. Terminalde a\u015fa\u011f\u0131daki komutu kullan\u0131n:<\/p>\n
sudo openvpn --config \/etc\/openvpn\/client\/myvpn.ovpn<\/code><\/pre>\n
    E\u011fer yap\u0131land\u0131rma dosyan\u0131z kullan\u0131c\u0131 ad\u0131 ve \u015fifre gerektiriyorsa, OpenVPN sizden bu bilgileri isteyecektir. Bu bilgileri bir dosyada saklamak ve .ovpn<\/code> dosyas\u0131na auth-user-pass \/path\/to\/credentials.txt<\/code> sat\u0131r\u0131n\u0131 eklemek de m\u00fcmk\u00fcnd\u00fcr. credentials.txt<\/code> dosyas\u0131 ilk sat\u0131rda kullan\u0131c\u0131 ad\u0131n\u0131, ikinci sat\u0131rda \u015fifreyi i\u00e7ermelidir ve sadece root kullan\u0131c\u0131s\u0131 taraf\u0131ndan okunabilir olmal\u0131d\u0131r (chmod 600 credentials.txt<\/code>).<\/p>\n
4.  Ba\u011flant\u0131y\u0131 Do\u011frulama:<\/strong>
\n    VPN ba\u011flant\u0131n\u0131z\u0131n ba\u015far\u0131l\u0131 olup olmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in birka\u00e7 y\u00f6ntem kullanabilirsiniz:<\/p>\n
    *   IP Adresi Kontrol\u00fc:<\/strong> \u0130nternete \u00e7\u0131k\u0131\u015f IP adresinizin de\u011fi\u015fip de\u011fi\u015fmedi\u011fini kontrol edin.<\/p>\n
curl ifconfig.me<\/code><\/pre>\n
        Bu komutun d\u00f6nd\u00fcrd\u00fc\u011f\u00fc IP adresi, VPN sunucusunun IP adresi olmal\u0131d\u0131r.<\/p>\n
    *   A\u011f Aray\u00fczlerini Kontrol Etme:<\/strong> OpenVPN ba\u011flant\u0131s\u0131 kuruldu\u011funda, sisteminizde tun0<\/code> veya tap0<\/code> gibi yeni bir a\u011f aray\u00fcz\u00fc olu\u015fur.<\/p>\n
ip addr show tun0<\/code><\/pre>\n
        Bu aray\u00fczde bir IP adresi atanm\u0131\u015f olmal\u0131d\u0131r.<\/p>\n
    *   Rota Tablosunu Kontrol Etme:<\/strong> VPN ba\u011flant\u0131s\u0131 genellikle t\u00fcm trafi\u011fi VPN t\u00fcneli \u00fczerinden y\u00f6nlendirmek i\u00e7in varsay\u0131lan rotay\u0131 de\u011fi\u015ftirir.<\/p>\n
ip route show<\/code><\/pre>\n
        VPN sunucusuna giden bir rota ve yeni bir varsay\u0131lan rota g\u00f6rmelisiniz.<\/p>\n
5.  Ba\u011flant\u0131y\u0131 Otomatik Ba\u015flatma (Systemd ile):<\/strong>
\n    Debian 8, Systemd kullan\u0131r. OpenVPN ba\u011flant\u0131n\u0131z\u0131 sistem ba\u015flang\u0131c\u0131nda otomatik olarak ba\u015flatmak i\u00e7in bir Systemd hizmeti olu\u015fturabilirsiniz.<\/p>\n
    *   \u00d6ncelikle, .ovpn<\/code> dosyan\u0131z\u0131n ad\u0131n\u0131 kullanarak bir hizmet dosyas\u0131 olu\u015fturun. \u00d6rne\u011fin, myvpn.ovpn<\/code> i\u00e7in openvpn@myvpn.service<\/code> ad\u0131nda bir sembolik ba\u011f olu\u015fturabilirsiniz.<\/p>\n
sudo cp \/usr\/share\/doc\/openvpn\/examples\/systemd\/openvpn@.service \/etc\/systemd\/system\/\n        sudo systemctl enable openvpn@myvpn\n        sudo systemctl start openvpn@myvpn<\/code><\/pre>\n
        Bu ad\u0131mlar, OpenVPN hizmetinin myvpn.ovpn<\/code> yap\u0131land\u0131rma dosyas\u0131n\u0131 kullanarak otomatik olarak ba\u015flamas\u0131n\u0131 sa\u011flar. Yap\u0131land\u0131rma dosyan\u0131z\u0131n \/etc\/openvpn\/<\/code> dizininde olmas\u0131 gerekti\u011fini unutmay\u0131n. E\u011fer farkl\u0131 bir dizinde ise, Systemd birim dosyas\u0131n\u0131 d\u00fczenlemeniz gerekebilir.<\/p>\n
Avantajlar ve Dezavantajlar<\/h4>\n
*   Avantajlar:<\/strong> Kurulumu nispeten kolayd\u0131r. T\u00fcm internet trafi\u011fi \u015fifrelenir ve IP adresiniz gizlenir. G\u00fcvenilir VPN sa\u011flay\u0131c\u0131lar\u0131 ile y\u00fcksek h\u0131z ve kararl\u0131l\u0131k sunar.
\n*   Dezavantajlar:<\/strong> VPN sa\u011flay\u0131c\u0131s\u0131na g\u00fcvenmeniz gerekir. Baz\u0131 \u00fccretsiz VPN hizmetleri g\u00fcvenli olmayabilir veya veri s\u0131n\u0131rlamalar\u0131 getirebilir.<\/p>\n
2. Y\u00f6ntem: Debian 8’i OpenVPN Destekli Bir A\u011f Ge\u00e7idi Olarak Kullanma<\/h3>\n
Bu y\u00f6ntem, Debian 8 makinenizi yerel a\u011f\u0131n\u0131z i\u00e7in bir VPN a\u011f ge\u00e7idine veya y\u00f6nlendiricisine d\u00f6n\u00fc\u015ft\u00fcrmeyi i\u00e7erir. Debian 8 makineniz, harici bir VPN hizmetine ba\u011flan\u0131r (t\u0131pk\u0131 1. y\u00f6ntemde oldu\u011fu gibi) ve ard\u0131ndan bu g\u00fcvenli VPN ba\u011flant\u0131s\u0131n\u0131 yerel a\u011f\u0131n\u0131zdaki (LAN) di\u011fer cihazlarla payla\u015f\u0131r. Bu sayede, yerel a\u011fdaki t\u00fcm cihazlar (masa\u00fcst\u00fc bilgisayarlar, diz\u00fcst\u00fc bilgisayarlar, ak\u0131ll\u0131 telefonlar vb.) Debian 8 \u00fczerinden internete VPN t\u00fcneli arac\u0131l\u0131\u011f\u0131yla \u00e7\u0131kabilir. Bu, t\u00fcm ev veya k\u00fc\u00e7\u00fck ofis a\u011f\u0131n\u0131z i\u00e7in merkezi bir g\u00fcvenlik noktas\u0131 olu\u015fturur.<\/p>\n
\u00d6n Ko\u015fullar<\/h4>\n
*   Debian 8 (“Jessie”) kurulu bir sistem.
\n*   \u0130nternet ba\u011flant\u0131s\u0131.
\n*   En az iki a\u011f aray\u00fcz\u00fc (biri WAN\/internet i\u00e7in, di\u011feri LAN i\u00e7in). Sanal makinelerde veya tek bir fiziksel aray\u00fczle VLAN’lar kullanarak da yap\u0131labilir, ancak iki fiziksel aray\u00fcz idealdir.
\n*   Bir VPN sa\u011flay\u0131c\u0131s\u0131ndan veya kendi OpenVPN sunucunuzdan temin edilmi\u015f OpenVPN yap\u0131land\u0131rma dosyalar\u0131.
\n*   Temel a\u011f bilgisi (IP adresleme, NAT).<\/p>\n
Kurulum Ad\u0131mlar\u0131<\/h4>\n
1.  OpenVPN \u0130stemcisini Kurma (1. Y\u00f6ntemdeki Gibi):<\/strong>
\n    \u00d6ncelikle, Debian 8 makinenizde OpenVPN istemcisini kurun ve yap\u0131land\u0131rma dosyalar\u0131n\u0131 haz\u0131rlay\u0131n. Bu ad\u0131mlar, 1. y\u00f6ntemde a\u00e7\u0131kland\u0131\u011f\u0131 gibidir. OpenVPN ba\u011flant\u0131s\u0131n\u0131n ba\u015far\u0131yla kurulabildi\u011finden emin olun.<\/p>\n
sudo apt-get update\n    sudo apt-get install openvpn<\/code><\/pre>\n
    Yap\u0131land\u0131rma dosyalar\u0131n\u0131 \/etc\/openvpn\/client\/<\/code> alt\u0131na kopyalay\u0131n ve myvpn.ovpn<\/code> olarak adland\u0131r\u0131n.<\/p>\n
2.  A\u011f Aray\u00fczlerini Yap\u0131land\u0131rma:<\/strong>
\n    Debian 8 makinenizin iki a\u011f aray\u00fcz\u00fc olmal\u0131d\u0131r:
\n    *   eth0<\/code> (veya benzeri): \u0130nternet ba\u011flant\u0131s\u0131 (WAN). DHCP ile otomatik IP alabilir veya statik olarak yap\u0131land\u0131r\u0131labilir.
\n    *   eth1<\/code> (veya benzeri): Yerel a\u011f ba\u011flant\u0131s\u0131 (LAN). Statik bir IP adresine sahip olmal\u0131d\u0131r (\u00f6rne\u011fin, 192.168.2.1\/24<\/code>).<\/p>\n
    \/etc\/network\/interfaces<\/code> dosyas\u0131n\u0131 d\u00fczenleyerek LAN aray\u00fcz\u00fcn\u00fc yap\u0131land\u0131r\u0131n:<\/p>\n
sudo nano \/etc\/network\/interfaces<\/code><\/pre>\n
    A\u015fa\u011f\u0131daki sat\u0131rlar\u0131 ekleyin (e\u011fer eth1<\/code> LAN aray\u00fcz\u00fcn\u00fczse):<\/p>\n
auto eth1\n    iface eth1 inet static\n        address 192.168.2.1\n        netmask 255.255.255.0<\/code><\/pre>\n
    De\u011fi\u015fiklikleri kaydedin ve a\u011f aray\u00fcz\u00fcn\u00fc yeniden ba\u015flat\u0131n:<\/p>\n
sudo ifdown eth1 && sudo ifup eth1<\/code><\/pre>\n
3.  IP Y\u00f6nlendirmeyi Etkinle\u015ftirme:<\/strong>
\n    Debian 8 makinenizin paketleri bir aray\u00fczden al\u0131p di\u011ferine y\u00f6nlendirebilmesi i\u00e7in IP y\u00f6nlendirmeyi etkinle\u015ftirmeniz gerekir.<\/p>\n
sudo nano \/etc\/sysctl.conf<\/code><\/pre>\n
    Dosyan\u0131n i\u00e7inde net.ipv4.ip_forward=1<\/code> sat\u0131r\u0131n\u0131 bulun ve yorum sat\u0131r\u0131 olmaktan \u00e7\u0131kar\u0131n (ba\u015f\u0131ndaki #<\/code> i\u015faretini kald\u0131r\u0131n). E\u011fer yoksa, dosyan\u0131n sonuna ekleyin.<\/p>\n
    De\u011fi\u015fiklikleri kaydettikten sonra, a\u015fa\u011f\u0131daki komutla hemen uygulay\u0131n:<\/p>\n
sudo sysctl -p<\/code><\/pre>\n
4.  NAT (Network Address Translation) Yap\u0131land\u0131rmas\u0131 (iptables ile):<\/strong>
\n    Yerel a\u011fdaki cihazlar\u0131n internete \u00e7\u0131kabilmesi i\u00e7in Debian 8 makinesinin NAT yapmas\u0131 gerekir. Bu, iptables<\/code> g\u00fcvenlik duvar\u0131 kurallar\u0131 ile yap\u0131l\u0131r. OpenVPN t\u00fcneli kuruldu\u011funda genellikle tun0<\/code> ad\u0131nda bir aray\u00fcz olu\u015fur.<\/p>\n
    A\u015fa\u011f\u0131daki iptables<\/code> kurallar\u0131n\u0131 uygulay\u0131n:<\/p>\n
sudo iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT\n    sudo iptables -A FORWARD -s 192.168.2.0\/24 -j ACCEPT\n    sudo iptables -A FORWARD -j REJECT --reject-with icmp-host-prohibited\n    sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE<\/code><\/pre>\n
    *   \u0130lk iki kural, ilgili ve yeni ba\u011flant\u0131lar\u0131n y\u00f6nlendirilmesine izin verir.
\n    *   \u00dc\u00e7\u00fcnc\u00fc kural, a\u00e7\u0131k\u00e7a izin verilmeyen di\u011fer t\u00fcm y\u00f6nlendirme trafi\u011fini engeller.
\n    *   Son kural (-t nat -A POSTROUTING -o tun0 -j MASQUERADE<\/code>), yerel a\u011fdaki cihazlardan gelen trafi\u011fin VPN t\u00fcneli (tun0<\/code>) \u00fczerinden \u00e7\u0131karken Debian 8’in IP adresine \u00e7evrilmesini (NAT) sa\u011flar.<\/p>\n
    \u00d6nemli:<\/strong> E\u011fer VPN ba\u011flant\u0131n\u0131z tun0<\/code> yerine ba\u015fka bir aray\u00fcz ad\u0131 kullan\u0131yorsa (\u00f6rne\u011fin tun1<\/code> veya tap0<\/code>), tun0<\/code> yerine ilgili aray\u00fcz ad\u0131n\u0131 kullanmal\u0131s\u0131n\u0131z.<\/p>\n
    iptables Kurallar\u0131n\u0131 Kal\u0131c\u0131 Hale Getirme:<\/strong>
\n    iptables<\/code> kurallar\u0131 sistem yeniden ba\u015flat\u0131ld\u0131\u011f\u0131nda kaybolur. Bu kurallar\u0131 kal\u0131c\u0131 hale getirmek i\u00e7in iptables-persistent<\/code> paketini kullanabilirsiniz:<\/p>\n
sudo apt-get install iptables-persistent<\/code><\/pre>\n
    Kurulum s\u0131ras\u0131nda mevcut kurallar\u0131 kaydetmek isteyip istemedi\u011finiz sorulacakt\u0131r. “Yes” se\u00e7ene\u011fini se\u00e7in. Daha sonra kurallar\u0131 manuel olarak kaydetmek i\u00e7in:<\/p>\n
sudo netfilter-persistent save<\/code><\/pre>\n
5.  DHCP Sunucusu Kurma (\u0130ste\u011fe Ba\u011fl\u0131 ama \u00d6nerilen):<\/strong>
\n    Yerel a\u011fdaki cihazlar\u0131n otomatik olarak IP adresi ve DNS sunucusu alabilmesi i\u00e7in Debian 8 \u00fczerinde bir DHCP sunucusu kurmak kullan\u0131\u015fl\u0131d\u0131r.<\/p>\n
sudo apt-get install isc-dhcp-server<\/code><\/pre>\n
    \/etc\/default\/isc-dhcp-server<\/code> dosyas\u0131n\u0131 d\u00fczenleyerek DHCP sunucusunun hangi aray\u00fczde dinleyece\u011fini belirtin:<\/p>\n
sudo nano \/etc\/default\/isc-dhcp-server<\/code><\/pre>\n
    INTERFACES<\/code> sat\u0131r\u0131n\u0131 bulun ve LAN aray\u00fcz\u00fcn\u00fcz\u00fc ekleyin (\u00f6rne\u011fin eth1<\/code>):<\/p>\n
INTERFACES=\"eth1\"<\/code><\/pre>\n
    \/etc\/dhcp\/dhcpd.conf<\/code> dosyas\u0131n\u0131 d\u00fczenleyerek DHCP havuzunu yap\u0131land\u0131r\u0131n:<\/p>\n
sudo nano \/etc\/dhcp\/dhcpd.conf<\/code><\/pre>\n
    Dosyan\u0131n en alt\u0131na a\u015fa\u011f\u0131daki blo\u011fu ekleyin (a\u011f adresinizi ve DNS sunucular\u0131n\u0131z\u0131 kendi tercihlerinize g\u00f6re ayarlay\u0131n):<\/p>\n
subnet 192.168.2.0 netmask 255.255.255.0 {\n        range 192.168.2.100 192.168.2.200;\n        option routers 192.168.2.1; # Debian 8'in LAN IP adresi\n        option domain-name-servers 8.8.8.8, 8.8.4.4; # Google DNS veya tercih etti\u011finiz DNS\n        option broadcast-address 192.168.2.255;\n        default-lease-time 600;\n        max-lease-time 7200;\n    }<\/code><\/pre>\n
    DHCP sunucusunu ba\u015flat\u0131n:<\/p>\n
sudo systemctl start isc-dhcp-server\n    sudo systemctl enable isc-dhcp-server<\/code><\/pre>\n
6.  OpenVPN Ba\u011flant\u0131s\u0131n\u0131 Ba\u015flatma ve Otomatikle\u015ftirme:<\/strong>
\n    1. y\u00f6ntemde a\u00e7\u0131kland\u0131\u011f\u0131 gibi OpenVPN ba\u011flant\u0131s\u0131n\u0131 ba\u015flat\u0131n ve Systemd ile otomatik ba\u015flatmay\u0131 ayarlay\u0131n. OpenVPN hizmetinin DHCP sunucusundan \u00f6nce veya sonra ba\u015flamas\u0131 \u00f6nemli de\u011fildir, ancak iptables kurallar\u0131n\u0131n OpenVPN aray\u00fcz\u00fc (tun0<\/code>) olu\u015fmadan \u00f6nce uygulanmamas\u0131 gerekir. \u0130ptables kurallar\u0131 netfilter-persistent<\/code> ile otomatik y\u00fcklenecektir.<\/p>\n
sudo systemctl start openvpn@myvpn\n    sudo systemctl enable openvpn@myvpn<\/code><\/pre>\n
Kullan\u0131m ve Do\u011frulama<\/h4>\n
Yerel a\u011fdaki di\u011fer cihazlar\u0131 (\u00f6rne\u011fin, bir diz\u00fcst\u00fc bilgisayar veya ak\u0131ll\u0131 telefon) Debian 8 makinenizin LAN aray\u00fcz\u00fcne ba\u011flay\u0131n (kablolu veya kablosuz bir eri\u015fim noktas\u0131 \u00fczerinden). Bu cihazlar\u0131n IP adresi ve DNS sunucular\u0131n\u0131 otomatik olarak almas\u0131 i\u00e7in DHCP’yi kullanmas\u0131 gerekir.<\/p>\n
Ba\u011fland\u0131ktan sonra, bu cihazlardan herhangi birinde bir web taray\u0131c\u0131s\u0131 a\u00e7\u0131n ve whatismyip.com<\/code> veya ifconfig.me<\/code> gibi bir siteye gidin. G\u00f6sterilen IP adresinin VPN sunucusunun IP adresi olmas\u0131 gerekir. Bu, t\u00fcm trafi\u011fin Debian 8 \u00fczerinden VPN t\u00fcneli arac\u0131l\u0131\u011f\u0131yla y\u00f6nlendirildi\u011fini do\u011frular.<\/p>\n
Avantajlar ve Dezavantajlar<\/h4>\n
*   Avantajlar:<\/strong> T\u00fcm yerel a\u011fdaki cihazlar i\u00e7in merkezi VPN korumas\u0131 sa\u011flar. Her cihazda ayr\u0131 ayr\u0131 VPN istemcisi kurma gereksinimini ortadan kald\u0131r\u0131r. Ak\u0131ll\u0131 TV’ler, oyun konsollar\u0131 gibi VPN istemcisi kurulamayan cihazlar bile korunur.
\n*   Dezavantajlar:<\/strong> Kurulumu daha karma\u015f\u0131kt\u0131r. Debian 8 makinesinin s\u00fcrekli a\u00e7\u0131k kalmas\u0131 gerekir. A\u011f performans\u0131, Debian 8 makinesinin donan\u0131m\u0131na ve VPN ba\u011flant\u0131 h\u0131z\u0131na ba\u011fl\u0131d\u0131r.<\/p>\n
3. Y\u00f6ntem: OpenVPN \u0130stemcisi ile Tor’u Birle\u015ftirerek Geli\u015fmi\u015f Gizlilik<\/h3>\n
Bu y\u00f6ntem, Debian 8 makineniz \u00fczerinde OpenVPN istemcisini Tor (The Onion Router) a\u011f\u0131 ile birle\u015ftirerek \u00e7ok katmanl\u0131 bir g\u00fcvenlik ve anonimlik sa\u011flamay\u0131 hedefler. Temel fikir, internet trafi\u011finizin \u00f6nce OpenVPN t\u00fcneli \u00fczerinden \u015fifrelenip VPN sunucusuna gitmesi, ard\u0131ndan VPN sunucusundan Tor a\u011f\u0131na girerek birden fazla d\u00fc\u011f\u00fcm \u00fczerinden y\u00f6nlendirilmesi ve en sonunda Tor \u00e7\u0131k\u0131\u015f d\u00fc\u011f\u00fcm\u00fcnden internete \u00e7\u0131kmas\u0131d\u0131r. Bu yap\u0131land\u0131rma “VPN over Tor” olarak bilinir ve kimli\u011finizi tespit etmeyi son derece zorla\u015ft\u0131r\u0131r.<\/p>\n
Not:<\/strong> Bu y\u00f6ntem, Tor’un h\u0131z\u0131n\u0131 ve VPN’in g\u00fcvenli\u011fini birle\u015ftirmeyi ama\u00e7lar. Ancak, Tor a\u011f\u0131 do\u011fas\u0131 gere\u011fi yava\u015ft\u0131r ve VPN katman\u0131 ek gecikmeye neden olacakt\u0131r. Bu y\u00f6ntem daha \u00e7ok anonimlik ve sans\u00fcrden ka\u00e7\u0131nma i\u00e7in uygundur, genel internet gezinme h\u0131z\u0131 i\u00e7in de\u011fil.<\/p>\n
\u00d6n Ko\u015fullar<\/h4>\n
*   Debian 8 (“Jessie”) kurulu bir sistem.
\n*   \u0130nternet ba\u011flant\u0131s\u0131.
\n*   \u00c7al\u0131\u015fan bir OpenVPN istemci yap\u0131land\u0131rmas\u0131 (1. y\u00f6ntemde a\u00e7\u0131kland\u0131\u011f\u0131 gibi).
\n*   Tor a\u011f\u0131 hakk\u0131nda temel bilgi.<\/p>\n
Kurulum Ad\u0131mlar\u0131<\/h4>\n
1.  OpenVPN \u0130stemcisini Kurma ve Ba\u011flant\u0131y\u0131 Do\u011frulama (1. Y\u00f6ntemdeki Gibi):<\/strong>
\n    Bu y\u00f6nteme ba\u015flamadan \u00f6nce, Debian 8 makinenizin harici bir VPN hizmetine ba\u015far\u0131yla ba\u011flanabildi\u011finden ve trafi\u011fini \u015fifreleyebildi\u011finden emin olun. 1. y\u00f6ntemde a\u00e7\u0131klanan t\u00fcm ad\u0131mlar\u0131 tamamlay\u0131n.<\/p>\n
sudo apt-get update\n    sudo apt-get install openvpn\n    # OpenVPN yap\u0131land\u0131rma dosyan\u0131z\u0131 yerle\u015ftirin ve ba\u011flant\u0131y\u0131 test edin.<\/code><\/pre>\n
2.  Tor Paketini Y\u00fckleme:<\/strong>
\n    Tor istemcisini Debian 8 sisteminize kurun. Tor, varsay\u0131lan olarak 9050 numaral\u0131 portta bir SOCKS5 proxy’si olarak \u00e7al\u0131\u015f\u0131r.<\/p>\n
sudo apt-get install tor<\/code><\/pre>\n
3.  Tor Servisini Ba\u015flatma ve Yap\u0131land\u0131rma:<\/strong>
\n    Tor, kurulumdan sonra genellikle otomatik olarak ba\u015flar. Durumunu kontrol edebilirsiniz:<\/p>\n
sudo systemctl status tor<\/code><\/pre>\n
    Tor yap\u0131land\u0131rma dosyas\u0131 \/etc\/tor\/torrc<\/code> i\u00e7indedir. Genellikle varsay\u0131lan ayarlar yeterlidir, ancak SocksPort 9050<\/code> sat\u0131r\u0131n\u0131n etkin oldu\u011fundan (yorum sat\u0131r\u0131 olmad\u0131\u011f\u0131ndan) emin olun.<\/p>\n
sudo nano \/etc\/tor\/torrc<\/code><\/pre>\n
    E\u011fer de\u011fi\u015ftirmeniz gerekirse, de\u011fi\u015fiklikleri kaydettikten sonra Tor servisini yeniden ba\u015flat\u0131n:<\/p>\n
sudo systemctl restart tor<\/code><\/pre>\n
4.  Uygulamalar\u0131 Tor Proxy’si \u00dczerinden Y\u00f6nlendirme:<\/strong>
\n    Bu y\u00f6ntemde, \u00f6nce OpenVPN ba\u011flant\u0131s\u0131n\u0131 kuracak, ard\u0131ndan uygulamalar\u0131n\u0131z\u0131 Tor SOCKS5 proxy’sini (localhost:9050<\/code>) kullanacak \u015fekilde yap\u0131land\u0131racaks\u0131n\u0131z.<\/p>\n
    *   Web Taray\u0131c\u0131s\u0131 (Firefox\/Chromium):<\/strong>
\n        \u00c7o\u011fu web taray\u0131c\u0131s\u0131, proxy ayarlar\u0131n\u0131 manuel olarak yap\u0131land\u0131rman\u0131za izin verir.
\n        *   Firefox i\u00e7in:<\/strong> Ayarlar -> A\u011f Ayarlar\u0131 -> Ba\u011flant\u0131 Ayarlar\u0131 -> Manuel Proxy Yap\u0131land\u0131rmas\u0131.
\n            *   SOCKS Host: 127.0.0.1<\/code>
\n            *   Port: 9050<\/code>
\n            *   SOCKS v5 se\u00e7ene\u011fini i\u015faretleyin.
\n            *   “Uzak DNS’i SOCKS v5 \u00fczerinden \u00e7\u00f6z” se\u00e7ene\u011fini i\u015faretlemek, DNS s\u0131z\u0131nt\u0131lar\u0131n\u0131 \u00f6nlemek i\u00e7in \u00f6nemlidir.<\/p>\n
    *   Di\u011fer Uygulamalar (proxychains ile):<\/strong>
\n        proxychains<\/code> arac\u0131, belirli uygulamalar\u0131n Tor proxy’si \u00fczerinden \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar.<\/p>\n
sudo apt-get install proxychains4<\/code><\/pre>\n
        \/etc\/proxychains.conf<\/code> dosyas\u0131n\u0131 d\u00fczenleyin:<\/p>\n
sudo nano \/etc\/proxychains.conf<\/code><\/pre>\n
        dynamic_chain<\/code> veya strict_chain<\/code> gibi zincir tipini se\u00e7in. En alttaki [ProxyList]<\/code> b\u00f6l\u00fcm\u00fcnde, sadece Tor proxy’sini b\u0131rak\u0131n:<\/p>\n
# dynamic_chain\n        # strict_chain\n        # random_chain\n        # round_robin_chain\n        \n        chain_proxies\n        \n        # Make sure that the last proxy in the chain is a SOCKS5 proxy\n        # because Tor only supports SOCKS5.\n        \n        [ProxyList]\n        # add proxy here ...\n        # meanwile\n        # socks5 127.0.0.1 9050\n        socks5  127.0.0.1 9050<\/code><\/pre>\n
        Bir uygulamay\u0131 proxychains<\/code> ile \u00e7al\u0131\u015ft\u0131rmak i\u00e7in:<\/p>\n
proxychains firefox\n        proxychains curl ifconfig.me<\/code><\/pre>\n
5.  Ba\u011flant\u0131y\u0131 Do\u011frulama:<\/strong>
\n    1.  OpenVPN Ba\u011flant\u0131s\u0131n\u0131 Ba\u015flat\u0131n:<\/strong><\/p>\n
sudo openvpn --config \/etc\/openvpn\/client\/myvpn.ovpn<\/code><\/pre>\n
    2.  Tor Servisinin \u00c7al\u0131\u015ft\u0131\u011f\u0131ndan Emin Olun:<\/strong><\/p>\n
sudo systemctl start tor<\/code><\/pre>\n
    3.  Taray\u0131c\u0131n\u0131z\u0131 veya Uygulaman\u0131z\u0131 Proxychains ile Ba\u015flat\u0131n:<\/strong>
\n        Taray\u0131c\u0131n\u0131z\u0131n proxy ayarlar\u0131n\u0131 Tor’a y\u00f6nlendirin veya proxychains<\/code> ile bir komut \u00e7al\u0131\u015ft\u0131r\u0131n.
\n    4.  IP Adresi Kontrol\u00fc:<\/strong>
\n        Taray\u0131c\u0131n\u0131zda check.torproject.org<\/code> adresine gidin. E\u011fer Tor a\u011f\u0131 \u00fczerinden ba\u011fl\u0131ysan\u0131z, size “Congratulations. This browser is configured to use Tor.” mesaj\u0131n\u0131 g\u00f6sterecektir. Ayr\u0131ca, curl ifconfig.me<\/code> komutunu proxychains<\/code> ile \u00e7al\u0131\u015ft\u0131r\u0131rsan\u0131z, Tor \u00e7\u0131k\u0131\u015f d\u00fc\u011f\u00fcm\u00fcn\u00fcn IP adresini g\u00f6rmelisiniz.<\/p>\n
        Bu, trafi\u011finizin \u00f6nce VPN’den ge\u00e7ip sonra Tor’a girdi\u011fini ve Tor \u00e7\u0131k\u0131\u015f d\u00fc\u011f\u00fcm\u00fcnden internete \u00e7\u0131kt\u0131\u011f\u0131n\u0131 do\u011frular.<\/p>\n
Avantajlar ve Dezavantajlar<\/h4>\n
*   Avantajlar:<\/strong> Son derece y\u00fcksek anonimlik ve gizlilik sa\u011flar. VPN sa\u011flay\u0131c\u0131n\u0131z\u0131n bile hangi sitelere ba\u011fland\u0131\u011f\u0131n\u0131z\u0131 g\u00f6rmesini engeller (VPN sa\u011flay\u0131c\u0131s\u0131 sadece Tor giri\u015f d\u00fc\u011f\u00fcm\u00fcne ba\u011fland\u0131\u011f\u0131n\u0131z\u0131 g\u00f6r\u00fcr). Sans\u00fcrden ka\u00e7\u0131nma i\u00e7in g\u00fc\u00e7l\u00fc bir \u00e7\u00f6z\u00fcmd\u00fcr.
\n*   Dezavantajlar:<\/strong> Performans d\u00fc\u015f\u00fc\u015f\u00fc ya\u015fan\u0131r (y\u00fcksek gecikme, d\u00fc\u015f\u00fck h\u0131z). Tor a\u011f\u0131n\u0131n do\u011fas\u0131 gere\u011fi baz\u0131 siteler Tor trafi\u011fini engelleyebilir. Yanl\u0131\u015f yap\u0131land\u0131rma durumunda anonimlik riskleri ta\u015f\u0131yabilir (\u00f6rne\u011fin, DNS s\u0131z\u0131nt\u0131lar\u0131). Her uygulama Tor proxy’sini desteklemez veya kolayca yap\u0131land\u0131r\u0131lamaz.<\/p>\n
Ek G\u00fcvenlik \u0130pu\u00e7lar\u0131 ve En \u0130yi Uygulamalar<\/h3>\n
OpenVPN kullanarak g\u00fcvenli gezinme sa\u011flarken, genel sistem g\u00fcvenli\u011finizi de ihmal etmemek \u00f6nemlidir. \u0130\u015fte Debian 8 sisteminiz i\u00e7in baz\u0131 ek g\u00fcvenlik ipu\u00e7lar\u0131:<\/p>\n
*   Sistem G\u00fcncellemeleri:<\/strong> Debian 8 sisteminizi d\u00fczenli olarak g\u00fcncelleyin. Bu, bilinen g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 kapatmaya yard\u0131mc\u0131 olur.<\/p>\n
sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade<\/code><\/pre>\n
*   G\u00fcvenlik Duvar\u0131 (Firewall):<\/strong> ufw<\/code> (Uncomplicated Firewall) veya iptables<\/code> kullanarak gereksiz portlar\u0131 kapat\u0131n ve sadece ihtiyac\u0131n\u0131z olan trafi\u011fe izin verin.<\/p>\n
sudo apt-get install ufw\n    sudo ufw enable\n    sudo ufw allow ssh # SSH eri\u015fimine izin vermek i\u00e7in\n    sudo ufw allow 1194\/udp # OpenVPN varsay\u0131lan portu i\u00e7in (e\u011fer sunucu kurduysan\u0131z)<\/code><\/pre>\n
*   SSH G\u00fcvenli\u011fi:<\/strong> SSH eri\u015fimini g\u00fc\u00e7lendirin. Parola yerine anahtar tabanl\u0131 kimlik do\u011frulamas\u0131 kullan\u0131n, root ile do\u011frudan giri\u015fi devre d\u0131\u015f\u0131 b\u0131rak\u0131n ve varsay\u0131lan SSH portunu de\u011fi\u015ftirin.
\n*   Taray\u0131c\u0131 G\u00fcvenli\u011fi:<\/strong> Web taray\u0131c\u0131n\u0131zda gizlilik odakl\u0131 eklentiler kullan\u0131n (uBlock Origin, Privacy Badger, HTTPS Everywhere). Taray\u0131c\u0131n\u0131z\u0131n gizlilik ayarlar\u0131n\u0131 g\u00fc\u00e7lendirin ve \u00e7erezleri d\u00fczenli olarak temizleyin.
\n*   Strong Parolalar:<\/strong> T\u00fcm hesaplar\u0131n\u0131z ve sisteminiz i\u00e7in g\u00fc\u00e7l\u00fc, benzersiz parolalar kullan\u0131n. Parola y\u00f6neticisi kullanmay\u0131 d\u00fc\u015f\u00fcn\u00fcn.
\n*   VPN Sa\u011flay\u0131c\u0131s\u0131 Se\u00e7imi:<\/strong> E\u011fer ticari bir VPN hizmeti kullan\u0131yorsan\u0131z, g\u00fcvenilir, “no-logs” politikas\u0131na sahip ve iyi bir itibara sahip bir sa\u011flay\u0131c\u0131 se\u00e7in.<\/p>\n
Sonu\u00e7<\/h3>\n
Debian 8 \u00fczerinde OpenVPN kullanarak internette g\u00fcvenli bir \u015fekilde gezinmek i\u00e7in \u00fc\u00e7 farkl\u0131 ve etkili y\u00f6ntem sunduk. Her bir y\u00f6ntem, farkl\u0131 g\u00fcvenlik ve kullan\u0131m senaryolar\u0131na hitap etmektedir:<\/p>\n
1.  Do\u011frudan OpenVPN \u0130stemcisi:<\/strong> Bireysel bir makinenin internet trafi\u011fini \u015fifrelemek ve IP adresini gizlemek i\u00e7in en basit ve do\u011frudan \u00e7\u00f6z\u00fcmd\u00fcr.
\n2.  OpenVPN Destekli A\u011f Ge\u00e7idi:<\/strong> T\u00fcm yerel a\u011f\u0131n\u0131zdaki cihazlar\u0131 tek bir merkezden VPN korumas\u0131na almak i\u00e7in idealdir. Ev veya k\u00fc\u00e7\u00fck ofis ortamlar\u0131 i\u00e7in merkezi bir g\u00fcvenlik sa\u011flar.
\n3.  OpenVPN + Tor Kombinasyonu:<\/strong> Maksimum anonimlik ve sans\u00fcrden ka\u00e7\u0131nma arayan kullan\u0131c\u0131lar i\u00e7in \u00e7ok katmanl\u0131 bir g\u00fcvenlik \u00e7\u00f6z\u00fcm\u00fc sunar, ancak performans maliyeti vard\u0131r.<\/p>\n
Hangi y\u00f6ntemi se\u00e7erseniz se\u00e7in, OpenVPN’in g\u00fc\u00e7l\u00fc \u015fifreleme ve esnek yap\u0131land\u0131rma yetenekleri sayesinde Debian 8 sisteminizde g\u00fcvenli bir \u00e7evrimi\u00e7i deneyim elde edebilirsiniz. Unutmay\u0131n ki hi\u00e7bir g\u00fcvenlik \u00e7\u00f6z\u00fcm\u00fc %100 kusursuz de\u011fildir; bu nedenle, sisteminizi g\u00fcncel tutmak, g\u00fc\u00e7l\u00fc parolalar kullanmak ve genel g\u00fcvenlik en iyi uygulamalar\u0131n\u0131 takip etmek, \u00e7evrimi\u00e7i g\u00fcvenli\u011finizin ayr\u0131lmaz bir par\u00e7as\u0131d\u0131r. Bu rehberdeki ad\u0131mlar\u0131 dikkatlice uygulayarak, Debian 8 makinenizi g\u00fcvenli internet gezinmesi i\u00e7in g\u00fc\u00e7l\u00fc bir kaleye d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"3 Y\u00f6ntemle Debian 8 \u00dczerinde OpenVPN ile G\u00fcvenli \u0130nternet Gezinmesi\n\u0130nternet \u00e7a\u011f\u0131nda gizlilik ve g\u00fcvenlik, her zamankinden daha kritik hale","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[241],"tags":[],"class_list":{"0":"post-36826","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-linux","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\n3 Y\u00f6ntemle Debian 8 \u00dczerinde OpenVPN ile G\u00fcvenli \u0130nternet Gezinmesi - 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