ak2@nvuxr.cc.bellcore.com (Arthur Knapp) (12/07/89)
Article <6539@tolerant.UUCP> hahn@tolerant.UUCP (John Hahn) John, Good question! Address interworking is never pretty. I am not sure what real packet-switches and real (public and private) packet-switched networks are doing but there are standards which may help you now or in the future. In 1984/1988 CCITT X.25 and ISO 8208-1986/1989 include a Address Extension Facility (AEF) parameter field. This field allows a calling DTE to include additional address information. e.g., an OSI Network-layer-address or another subnet address. The AEF contents field is variable length up to 20 octets. Both called and calling address extensions are specified. In RFC 1069, Callon and Braun suggest a NSAP address structure that includes the DoD IP address. Gateways can then strip out the DoD IP address when delivering an incoming PDU. Gateways can add the appropriate X.25 fields for an outgoing PDU. You wrote > Which then brings up the question if this is useable with the > Public Data Networks (i.e. Telenet, Tymnet, Transpac ..etc)? Does anyone know if any PSPDNs or vendors are supporting the AEF field? If so, do you know how many bytes the field is? Arthur Arthur Knapp ak2@nvuxr.cc.bellcore.com Tel: 201-758-2198 Fax: 201-530-6875 331 Newman Springs Road, Rm 1F-359 Red Bank, NJ 07701-7020 USA Telex: 275318