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Firewall

Firewall. Firewall. Jaringan Komputer (JarKom) SMAN 3 Pontianak. Apa itu firewall.

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Firewall

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  1. Firewall Firewall Jaringan Komputer (JarKom) SMAN 3 Pontianak

  2. Apa itu firewall • Firewall adalah suatu mekanisme, sehingga suatu client dari luar dilarang/dibolehkan mengakses ke dalam jaringan (atau client yang berada di dalam dilarang/dibolehkan mengakses keluar jaringan) berdasarkan aturan-aturan yang ditetapkan. • Seperti pos satpam di suatu instansi/perumahan • Bekerja di layer: antara 3 dan 4 (bahkan 5) di TCP/IP Model

  3. Istilah-istilah • Masquerading • Allows many machines to use the appear to come from the same IP address • Connections can only be initiated by internal host • NAT – Network Address Translation • The term “NAT” can mean many different things, see RFC2663 for details • Generally some router-level mapping and conversion between a set of private IP addresses and a single public IP address (IP Masq) or set of public IP addresses.

  4. Istilah-istilah • Masquerading • Masquerading = menyamar • Semua client menggunakan IP yang sama saat berhubungan dengan jaringan luar • NAT – Network Address Translation • Cara melakukan masquerading • Mengkonversi IP private menjadi IP public

  5. Mengapa butuh • Menerapkan kebijakan sistem keamanan • Me-manage resiko dari penyediaan layanan • Memisahkan / membagi jaringan sesuai dengan kebijakan / keperluan • Menyediakan kesiapan penggunaan sumber daya jaringan • Mengurangi resiko keamanan • Memblokir KEBANYAKAN ancaman • Memiliki kelemahan : Konfigurasi firewall yang tidak tepat oleh admin

  6. Cara kerja • Denganmenelitipaket-paket yang lewat firewall itudanmencocokkannyadenganmelihatdaftar/aturan yang diberikankepadanya. • Firewalls block certain traffic, while allowing other traffic to pass. • Different types of firewalls pass traffic using different methods • Packet Filtering • Proxy • Connection State Analysis

  7. Ada dua tipe utama • Firewalls rules are created to match policy • Rules are based on: • Routing based filters (Who – siapa) • Sender and Destination • berasaldarimana ? • Mau kemana ? • Tidakpedulimaungapaindisana • Content based filters (What – mauapa) • TCP/IP Port numbers and Services • Apa yang akankamulakukandisana ? • Tidaksemudah yang nomer 1, sebabkadang-kadangbisaditipuseorang client

  8. Dua pendekatan aturan • Default allow • Mengijinkan semua lewat kecuali yang terdaftar • Place roadblocks/watch gates along a wide open road. • Default deny • Semua dilarang lewat kecuali yang terdaftar • Build a wall and carve paths for everyone you like.

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