Re: NBAP over SCTP
Michael Tüxen <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Message-ID | <[email protected]> |
Hi Ben, comments in-line. Best regards Michael On Mar 31, 2008, at 2:25 PM, Ben Davis wrote: > Hello, > > Thanks for your reply. > Please correct me if I mis-undertood your reply: > 1) PPI is of no use for the upper protocol. Not true. The PPID is passed from the user at the sending side to the user of the receiving side without the SCTP stack touching it. > > 2) PPI is of no use for the upper protocol, whatever its value. Not true. The upper layer can do what it wants to do with it. For example it can be used to discriminate between multiple upper layers within one SCTP association. > > 3) PPI value could, therefore, even be one of those already > registered by IANA (worst case for the sniffer..). Does it make > sense ?? No. For determining the upper layer protocol, Wireshark uses the - Payload protocol identifier - the smaller value of source and destination port - the larger value if source and destination port in that order. > > > 4) What is the procedure to register a new value by IANA ? Go to the IANA Webpage and fill out a registration form. > > > Ben > > > 2008/3/28, Brian F. G. Bidulock <[email protected]>: Ben, > > PPI is largely optional and mostly so that protocol sniffers > can determine the transported protocol without relying on > well-known port numbers. A protocol does not require a PPI > to operate. Nevertheless, applying for one from IANA is a > straightforward procedure. > > --brian > > Ben Davis wrote: (Fri, 28 Mar 2008 > 17:56:39) > > > > > Hello, > > 3GPP specified that NBAP protocol can be transported over SCTP. > > No payload protocol identifier is currently dedicated to NBAP. > > How does this work ? > > Thanks > > Ben > > > > _______________________________________________ > > Sigtran mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/sigtran > > > > -- > Brian F. G. Bidulock > [email protected] > http://www.openss7.org/ > > _______________________________________________ > Sigtran mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/sigtran