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Table of Contents Expand all

play_arrow Overview
- play_arrow Next Gen Services Overview
  - Next Gen Services Overview
- play_arrow Configuration Overview
- play_arrow Global System Logging Overview and Configuration
- play_arrow Next Gen Services SNMP MIBS and Traps
  - Next Gen Services SNMP MIBs and Traps
play_arrow Carrier Grade NAT (CGNAT)
- play_arrow Deterministic NAT Overview and Configuration
  - Deterministic NAPT Overview for Next Gen Services
  - Configuring Deterministic NAPT for Next Gen Services
- play_arrow Dynamic Address-Only Source NAT Overview and Configuration
  - Dynamic Address-Only Source Translation Overview
  - Configuring Dynamic Address-Only Source NAT for Next Gen Services
- play_arrow Network Address Port Translation Overview and Configuration
  - Network Address Port Translation (NAPT) Overview
  - Configuring Network Address Port Translation for Next Gen Services
  - Configuring Syslog Events for NAT Rule Conditions with Next Gen Services
- play_arrow NAT46
  - NAT46 Next Gen Services Configuration Examples
- play_arrow Stateful NAT64 Overview and Configuration
  - Stateful NAT64 Overview
  - IPv4 Addresses Embedded in IPv6 Addresses
  - Configuring Next Gen Services Stateful NAT64
- play_arrow IPv4 Connectivity Across IPv6-Only Network Using 464XLAT Overview and Configuration
  - 464XLAT Overview
  - IPv4 Addresses Embedded in IPv6 Addresses
  - Configuring 464XLAT Provider-Side Translator for IPv4 Connectivity Across IPv6-Only Network for Next Gen Services
- play_arrow IPv6 NAT Protocol Translation (NAT PT)
  - IPv6 NAT PT Overview
  - IPv6 NAT-PT Communication Overview
- play_arrow Stateless Source Network Prefix Translation for IPv6 Overview and Configuration
  - Stateless Source Network Prefix Translation for IPv6
- play_arrow Transitioning to IPv6 Using Softwires
  - 6rd Softwires in Next Gen Services
- play_arrow Transitioning to IPv6 Using DS-Lite Softwires
  - DS-Lite Softwires—IPv4 over IPv6 for Next Gen Services
  - Configuring Next Gen Services DS-Lite Softwires
  - DS-Lite Subnet Limitation
  - Protecting CGN Devices Against Denial of Service (DOS) Attacks
- play_arrow Reducing Traffic and Bandwidth Requirements Using Port Control Protocol
  - Port Control Protocol Overview
  - Configuring Port Control Protocol
- play_arrow Transitioning to IPv6 Using Mapping of Address and Port with Encapsulation (MAP-E)
  - Mapping of Address and Port with Encapsulation (MAP-E) for Next Gen Services
  - Equal Cost Multiple Path (ECMP) support for Mapping of Address and Port with Encapsulation (MAP-E)
- play_arrow Monitoring and Troubleshooting Softwires
  - Ping and Traceroute for DS-Lite
  - Monitoring Softwire Statistics
  - Monitoring CGN, Stateful Firewall, and Softwire Flows
- play_arrow Port Forwarding Overview and Configuration
  - Port Forwarding for Next Gen Services
- play_arrow Port Translation Features Overview and Configuration
  - Address Pooling and Endpoint Independent Mapping for Port Translation
  - Round-Robin Port Allocation
  - Secured Port Block Allocation for Port Translation
- play_arrow Static Source NAT Overview and Configuration
  - Static Source NAT Overview
  - Configuring Static Source NAT44 or NAT66 for Next Gen Services
- play_arrow Static Destination NAT Overview and Configuration
  - Static Destination NAT Overview
  - Configuring Static Destination NAT for Next Gen Services
- play_arrow Twice NAPT Overview and Configuration
  - Twice NAPT Overview
  - Configuring Twice NAPT for Next Gen Services
- play_arrow Twice NAT Overview and Configuration
  - Twice Static NAT Overview
  - Configuring Twice Static NAT44 for Next Gen Services
  - Twice Dynamic NAT Overview
  - Configuring Twice Dynamic NAT for Next Gen Services
- play_arrow Class of Service Overview and Configuration
  - Class of Service for Services PICs (Next Gen Services)
play_arrow Stateful Firewall Services
- play_arrow Stateful Firewall Services Overview and Configuration
  - Stateful Firewall Overview for Next Gen Services
  - Configuring Stateful Firewalls for Next Gen Services
play_arrow Intrusion Detection Services
- play_arrow IDS Screens for Network Attack Protection Overview and Configuration
play_arrow Traffic Load Balancing
- play_arrow Traffic Load Balancing Overview and Configuration
  - Traffic Load Balancer Overview
  - Configuring TLB
play_arrow DNS Request Filtering
- play_arrow DNS Request Filtering Overview and Configuration
  - DNS Request Filtering for Disallowed Website Domains
  - DNS Request Filtering System Logging Error Messages
play_arrow URL Filtering
- play_arrow URL Filtering
  - URL Filtering Overview
  - Configuring URL Filtering
play_arrow Integration of Juniper ATP Cloud and Web filtering on MX Routers
- play_arrow Integration of Juniper ATP Cloud and Web filtering on MX Routers
  - Integration of Juniper ATP Cloud and Web Filtering on MX Series Routers
play_arrow Aggregated Multiservices Interfaces
- play_arrow Enabling Load Balancing and High Availability Using Multiservices Interfaces
play_arrow Inter-Chassis Services PIC High Availability
- play_arrow Inter-Chassis Services PIC High Availability Overview and Configuration
play_arrow Application Layer Gateways
- play_arrow Enabling Traffic to Pass Securely Using Application Layer Gateways
play_arrow NAT, Stateful Firewall, and IDS Flows
- play_arrow Inline NAT Services Overview and Configuration
play_arrow Configuration Statements
- Junos CLI Reference Overview

list Table of Contents

English

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IPv4 Addresses Embedded in IPv6 Addresses

date_range 06-Dec-23

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Stateful NAT64 and XLAT464 embed IPv4 addresses in IPv6 addresses by using an IPv6 prefix that you specify. The prefix length you use determines how the IPv4 address is embedded.

IPv6 addresses with embedded IPv4 addresses are composed of a variable-length prefix, the embedded IPv4 address, and a variable-length suffix. Bits 64 to 71 are reserved and must be set to 0. The suffix follows the last bit of the embedded IPv4 address, and the suffix bits are ignored and should be set to 0.

The format for the IPv4-embedded IPv6 address depends on the prefix length, as shown in Table 1.

Table 1: IPv6 Address With Embedded IPv4 Address
Prefix length	Prefix bits	IPv4 address bits	Reserved bits (must be set to 0)	Suffix bits
32	0-31	32 to 63	64 to 71	72 to 127
40	0 to 39	40 to 63 and 72 to 79	64 to 71	80 to 127
48	0 to 47	48 to 63 and 72 to 87	64 to 71	88 to 127
56	0 to 55	56 to 63 and 72 to 95	64 to 71	96 to 127
64	0 to 63	72 to 103	64 to 71	104 to 127
96	0 to 95	96 to 127	64 to 71	No suffix bits

The following table shows an example of an IPv4 address embedded in an IPv6 address for various prefix lengths.

IPv6 Prefix	IPv4 Address	IPv4 Address Embedded in IPv6 Address
2001:db8::/32	192.0.2.33	2001:db8:c000:221::
2001:db8:100::/40	192.0.2.33	2001:db8:1c0:2:21::
2001:db8:122::/48	192.0.2.33	2001:db8:122:c000:2:2100::
2001:db8:122:300::/56	192.0.2.33	2001:db8:122:3c0:0:221::
2001:db8:122:344::/64	192.0.2.33	2001:db8:122:344:c0:2:2100::
2001:db8:122:344::/96	192.0.2.33	2001:db8:122:344::192.0.2.33

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