Subnetting, NAT & PAT
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Transcript of Subnetting, NAT & PAT
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© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1
Subnetting,NAT & PAT
Jaringan Komputer 2 – Pertemuan 2
STMIK | Widya PratamaSlamet Joko Prasetiono,ST, MKom
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2© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Subnetting dan CIDR /25
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3© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Subnetting dan CIDR /26
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4© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Subnetting dan CIDR /25
Subnetting dan CIDR /26
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5© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Subnetting dan CIDR /27
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6© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Subnetting dan CIDR /27
Review Subnetting
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7© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Komunikasi antar subnet
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8© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Alamat IP Public dan Private
Semua host yang langsung terhubung dengan Internet memerlukan IP Address public yang unik.
Karena keterbatasan alamat yang 32-bit, maka dipastikan IP address yang tersedia akan habis.
Salah satu solusinya adalah dengan menyediakan beberapa alamat private yang digunakan dalam satu LAN.
Ini mengijinkan masing-masing host dalam satu LAN berkomunikasi tanpa menggunakan IP Address public yang unik.
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9© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
IP Address Private
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10© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Kiamat IPv4 segera tiba IPv6IANA dan IDNIC
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11© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
NAT
Network Address Translation (NAT) mengijinkan kumpulan dari IP private mengakses Internet dengan berbagi public IP address.
Seperti telepon PABX, tidak harus semua ruangan memiliki jalur telepon dari telkom tapi cukup dengan extension number.
Implementasinya layaknya di warnet yang punya banyak komputer tapi hanya memiliki satu line telepon
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12© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Keunggulan dan Kelemahan NAT
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13© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Proses NAT
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14© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
PAT adalah NAT Overload
PAT menterjemahkan multiple local address ke dalam single global IP address.
Ketika sebuah source host mengirim pesan ke sebuah destination host, dia menggunakan kombinasi IP address dan port number untuk tetap menjaga percakapan secara individual dengan destination host.
Di PAT, gateway mengubah kombinasi alamat local source dan port dalam paket ke sebuah global IP address dan port number yang unik diatas 1024.
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15© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
PAT
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16© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
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