Re: Clarify SCTP max packet size.
Michael Tüxen <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Message-ID | <[email protected]> |
Hi Brian, sorry, I do not understand what you want to say... Best regards Michael On Jul 7, 2009, at 8:02 PM, Brian F. G. Bidulock wrote: > Michael, > > Err, the MTU SCTP uses when bundling is the Association Path MTU. It > subtracts IP header and SCTP header sizes from this Path MTU only when > considering how many chunks can be bundled. > > --brian > > Michael Tüxen wrote: (Tue, 07 Jul 2009 > 18:51:09) >> On Jul 7, 2009, at 8:50 AM, <[email protected]> >> <[email protected] > wrote: >> >>> Dear all, >>> >>> Just to add with the SCTP bundling feature. If the "SCTP MTU" is >>> 1500, and the system is bundling messages at the SCTP level, you >>> should have the risk to segment at the IP level (because of the IP >>> header). So it is not efficient >> The MTU SCTP uses is the link layer MTU minus the headers for IP and >> SCTP. >> I have not seen an implementation which bundles at the SCTP layer and >> than >> needs to fragment at the IP layer. I would consider this broken... >>> to bundle sctp messages and to segment them at the IP level. Some >>> vendors limits "SCTP MTU" to avoid that. This is only the Maximum >>> transmission unit. If one SCTP message to transmit is greater, they >>> will segment it. >>> > > -- > Brian F. G. Bidulock > [email protected] > http://www.openss7.org/ >