NATs (Network Address Translators)

Slides:

Advertisements

Similar presentations

Possible Broadband Deployments Post IPv4 Completion Alain Durand, Work in progress #include.

Advertisements

Fred P. Baker CCIE, CCIP(security), CCSA, MCSE+I, MCSE(2000)

Configuring Internet Access for a Network. Overview Options for Connecting a Network to the Internet Configuring Internet Access by Using a Router Configuring.

CST Computer Networks NAT CST 415 4/10/2017 CST Computer Networks.

1 Teredo - Tunneling IPv6 through NATs Date: Speaker: Quincy Wu National Chiao Tung University.

Case Study: Pat Lee’s Home PC Network Chapter 1a Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only.

STUN Date: Speaker: Hui-Hsiung Chung 1.

Internet Gateway Device (IGD)

May 2007 PRESTO (Princeton, NJ) In-network Support for VoIP and Multimedia Applications Henning Schulzrinne Dept. of Computer Science Columbia University.

Information Networking Security and Assurance Lab National Chung Cheng University Private IP(RFC1918) The Internet Assigned Numbers Authority (IANA) has.

NAT (Network Address Translator) Atif Karamat In the name of God the most merciful and the most compassionate.

NAT: Network Address Translation local network (e.g., home network) /24 rest of Internet Datagrams.

Small Office Service Serial Router Connects Internal Stations to Shared Broadband Access Service Small Office Serial Router Shared Broadband Line ISP.

CSE5803 Advanced Internet Protocols and Applications (7) Introduction The IP addressing scheme discussed in Chapter 2 are classful and can be summarised.

M. Dahshan - TCOM52721 TCOM 5272 Telecomm Lab Dr. Mostafa Dahshan OU-Tulsa 4W 2 nd floor

Chapter 6 Network Address Translation (NAT). Network Address Translation  Modification of source or destination IP address  Needed by networks using.

NAT Network Address Translation. NAT Links cisco.shtmlhttp:// cisco.shtml.

IP Security. IPSEC Objectives n Band-aid for IPv4 u Spoofing a problem u Not designed with security or authentication in mind n IP layer mechanism for.

1 Spring Semester 2007, Dept. of Computer Science, Technion Internet Networking recitation #12 LSNAT - Load Sharing NAT (RFC 2391)

Case Study: Pat Lee’s Home PC Network Chapter 1a Updated January 2007 Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007.

1 Chapter Overview Subnet. What is a subnet When you break a network into a few smaller networks, you have created several subnets Like IP address where.

Middleboxes & Network Appliances EE122 TAs Past and Present.

Day15 IP Space/Setup. IP Suite of protocols –TCP –UDP –ICMP –GRE… Gives us many benefits –Routing of packets over internet –Fragmentation/Reassembly of.

4: Addressing Working At A Small-to-Medium Business or ISP.

Network Address Translation (NAT)

NAT (Network Address Translation) Natting means "Translation of private IP address into public IP address ". In order to communicate with internet we must.

9/11/2015Home Networking1 Bob.test Have Road Runner Unhappy about reports of constant probes of machines Policy decision –I want to prevent unauthorized.

CS 3214 Computer Systems Godmar Back Lecture 24 Supplementary Material.

1 IP: putting it all together Part 2 G53ACC Chris Greenhalgh.

Introduction to Network Address Translation

© 2007 Cisco Systems, Inc. All rights reserved.Cisco Public ITE PC v4.0 Chapter 1 1 Planning the Addressing Structure Working at a Small-to-Medium Business.

ISP Edge NAT 10/8 “Home” Network Upstreams and Peers /32

FUTURE INTERNET: PROPOSAL “PROBLEMS IN CURRENT INTERNET” M S Siddiqui [ID ] Networking LAB, KHU

Network Security1 – Chapter 6 – NAT and Security Network Address Translation (NAT) is useful: –Hide internal private IP addresses –Conserve routable IP.

NAT Network Address Translation. Reading CNI – pp Port Mapping LA – pp NAT.

Network Address Translation External/ Internal/. OVERLOADING In Overloading, each computer on the private network is translated to the same IP address;

NAT & PAT Network Address Translation Port Address Translation.

CITA 310 Section 3 Additional Topics. Common IPv4 Classes ClassFirst numberSubnet maskNumber of networks Number of addresses Class A0 – ,777,216.

NAT/PAT by S K SATAPATHY

1 Network Address Translation. 2 Network Address Translation (NAT) Extension of original addressing scheme Motivated by exhaustion of IP address space.

FIREWALLS By k.shivakumar 08k81f0025. CONTENTS Introduction. What is firewall? Hardware vs. software firewalls. Working of a software firewalls. Firewall.

XenClient Enterprise 4.5 Engine Network Addressing Modes.

CS 3700 Networks and Distributed Systems

Network Address Translation

Planning the Addressing Structure

4.3 Network Layer Logical Addressing

Supplementary Material

NAT : Network Address Translation

Network Address Translation

Chapter 13 Network Address Translation

Virtual Private Networks,

Supplementary Material

Network Address Translation (NAT)

Network Address Translation

In-network Support for VoIP and Multimedia Applications

CS 3700 Networks and Distributed Systems

Planning the Addressing Structure

– Chapter 6 – NAT and Security

Network Address Translation (NAT)

Introducing To Networking

NAT and Security Source: Ch. 6 of Malik

Cabrillo College Building Cisco Remote Access Network

CS 3700 Networks and Distributed Systems

Planning the Addressing Structure

NAT (Network Address Translation)‏

Planning the Addressing Structure

Planning the Addressing Structure

COMPUTER NETWORKS CS610 Lecture-38 Hammad Khalid Khan.

Prepared by :Adeel Ahmad

Network Address Translation (NAT)

Presentation transcript:

NATs (Network Address Translators) Henning Schulzrinne Dept. of Computer Science Columbia University Fall 2003

NATs Network address translation = local, LAN-specific address space translated to small number of globally routable IP addresses Motivation: scarce address space cost: about $9k/year for up to 262,000 addresses prevent home broadband users from running servers at home security: prevent unsolicited inbound requests avoid renumbering if provider changes most small/mid-sized LANs inherit address space from ISP

Prevalence of NATs Claim: 50% of broadband users are behind NATs All Linksys/D-Link/Netgear home routers are NATs Measurement: for Quake III users, about 17-25% using NAT (May/June 2001)

NAT details RFC 1631 (first description) RFC 1918 (private-use addresses) RFC 2663 RFC 2776 RFC 3022 RFC 3027 RFC 3235 RFC 3424 RFC 3489 (STUN)

NAT types All use net-10/8 (10.*.*.*) or 192.168/16 (172.16/12 also available) Address translation Address-and-port translation (NAPT) most common form today, still called NAT one external (global) IP address