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MACIP refers to a standard for encapsulating Internet Protocol
Internet Protocol
(IP) packets within the AppleTalk
AppleTalk
DDP protocol. This allows Macintosh computers with LocalTalk
LocalTalk
networking hardware to access the normally Ethernet
Ethernet
-based connections for TCP/IP
TCP/IP
based network services. This was an important bridging technology during the era when Ethernet
Ethernet
and TCP/IP
TCP/IP
were rapidly growing in popularity in the early 1990s.

Software implementing MacIP, such as MacTCP or Open Transport , was installed on the computer and a MacIP
MacIP
Gateway was placed elsewhere on the network. Applications that communicate with TCP/IP
TCP/IP
(such as Telnet ) have their IP packets encapsulated in DDP for transmission across the LocalTalk
LocalTalk
network to the MacIP
MacIP
Gateway. The MacIP
MacIP
Gateway strips off the DDP encapsulation and forwards the IP packet on the IP network.

The gateways were often implemented as part of a LocalTalk-to- Ethernet
Ethernet
bridge device, small hardware systems primarily designed to allow communications between LocalTalk
LocalTalk
and EtherTalk equipped AppleTalk
AppleTalk
machines (like the Mac II and a LaserWriter
LaserWriter
). MacIP
MacIP
routing was often implemented as an optional adjunct to the AppleTalk
AppleTalk
routing. Cisco Systems
Cisco Systems
supported AppleTalk
AppleTalk
in their proprietary IOS (up to and including version 12.4(15)T14, on select platforms) which in turn could provide MacIP-Services.

CONTENTS

* 1 History * 2 See also * 3 References * 4 External links

HISTORY

The practice of encapsulating IP packets within DDP was originally developed at Stanford University
Stanford University
as the Stanford Ethernet
Ethernet
- AppleTalk
AppleTalk
Gateway (SEAGATE) by Bill Croft in 1984 and 1985.

SEAGATE was commercialised by Kinetics as the Kinetics Internet Protocol (KIP) for use with their FastPath LocalTalk-to-Ethernet bridge . Apple Computer
Apple Computer
adopted the usage of KIP and refer to it as MacIP.

One of the mandates for the Internet Engineering Task Force
Internet Engineering Task Force
(IETF) "IP over AppleTalk" working group was to document existing MacIP implementations and to develop a specification for MacIP
MacIP
that could be proposed as a standard. A draft document was submitted, however it was not accepted as a standard and has subsequently expired.

Apple subsequently developed a new protocol AppleShare IP which is not backwardly compatible.

SEE ALSO

* GatorBox * LocalTalk-to- Ethernet
Ethernet
bridge * macipgw

REFERENCES

* ^ Cisco.com: AppleTalk
AppleTalk
Support Discontinuation * ^ Cisco.com: Setting Up MacIP, Doc-ID 10679 * ^ MacWorld 2004 Keynote: A History Of Macintosh
Macintosh
Networking - reported notes - See "Macs and the Internet: a long digression" * ^ MacWorld 2004 Keynote: A History Of Macintosh
Macintosh
Networking - relevant slide * ^ Bill Croft announces SEAGATE in TCP-IP list - See "000007" * ^ Bill Croft declares in net.micro.mac that Kinetics are using a modified version of the SEAGATE code * ^ IP Over AppleTalk
AppleTalk
Working Group Charter * ^ Internet-Drafts Database entry * ^ Latest draft document with content

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