Title: Multiprotocol Interconnect on X.25 and ISDN in the Packet Mode
Author(s): A. Malis, D. Robinson, R. Ullmann.
Status: DRAFT STANDARD
Date: Aug 1992
Length: 32043
Obsoletes: RFC877
This document specifies the encapsulation of IP and other network layer protocols over X.25 networks, in accordance and alignment with ISO/IEC and CCITT standards. It is a replacement for RFC877, "A Standard for the Transmission of IP Datagrams Over Public Data Networks" [1].
It was written to correct several ambiguities in the Internet Standard for IP/X.25 (RFC877), to align it with ISO/IEC standards that have been written following RFC877, to allow interoperable multiprotocol operation between routers and bridges over X.25, and to add some additional remarks based upon practical experience with the specification over the 8 years since that RFC.
The substantive change to the IP encapsulation is an increase in the allowed IP datagram Maximum Transmission Unit from 576 to 1600, to reflect existing practice.
This document also specifies the Internet encapsulation for protocols, including IP, on the packet mode of the ISDN. It applies to the use of Internet protocols on the ISDN in the circuit mode only when the circuit is established as an end-to-end X.25 connection.
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