Property:APIPA

---

BoxMatrix >> Lexicon >> Network-Protocols >> APIPA

@ BoxMatrix   -   IRC-Chat   -   Translate: de es fr it nl pl

News

Selectors

Models

Accessories

Components

Environment

Config

Commands

System

Webif

Software

Develop

Lexicon

Community

Project

Media

---

Computer

FRITZ

I18N

Telephony

Smarthome

Internet

Protocols

Multimedia

Formats

Hardware

Software

Research

---

Protocol

Protocol:	APIPA	Wiki	Freetz	IPPF	whmf	AVM	Web
Short for:	Automatic Private Internet Protocol Addressing
Location:	Lexicon >> Network-Protocols
Weblinks:	Wikipedia.int  -  Wikipedia.de   -  RFC-3927   -   MS-APIPA
Description:	Method to acquire a Link-Local IPv4 address

Goto:   FRITZ!OS   -   SMW-Browser

Details

APIPA also known as Auto-IP is a serverless method to acquire a Link-Local IPv4 address.
It is often used as a fallback method if no DHCP server can be found, ie. for Windows (98+) or SAT-IP servers.

APIPA uses the ARP protocol to make sure it chooses an IP which is not already in use.

The range for Link-Local IPv4 addresses is 169.254.0.1 - 169.254.255.254 inclusive.

For IPv6 the address block fe80::/10 has been reserved and discovery is performed by the NDP protocol instead.

Link-Local addresses are non-routable and can not access the Internet.

FRITZ!OS

FRITZ!OS does not use APIPA at all, but hardcoded Link-Local addresses are used.

Recent FRITZ!OS uses the hardcoded 169.254.1.1 Link-Local address as the Emergency-IP for the Webinterface.
It is provided by the lan:0 interface and uses maca, like the lan bridge.

root@fritz:/var/mod/root# ifconfig lan:0

lan:0     Link encap:Ethernet  HWaddr 3C:A6:2F:XX:XX:XX  
          inet addr:169.254.1.1  Bcast:169.254.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING ALLMULTI MULTICAST  MTU:1500  Metric:1

It is intended for a direct box to PC connection and it should never be accessed in a network with more devices.

A second usage of Link-Local addresses in FRITZ!OS is the Inter-CPU communication of Puma6 and Puma7 models.
It uses the hardcoded addresses 169.254.1.1 and 169.254.1.2.

SMW-Browser

Property:APIPA

Information is currently being retrieved from the backend.