Hi Arun, > What time should IP expect this hints from the upper layer protocol ?
Upper layer protocols should decide when in it possible for them to give advice to IP regarding whether another node is reachable. This advice may be given when there has been a positive demonstration of forward progress on a connection (i.e. an acknowledgement of data that was previously sent, a response to a query, etc.). It should not be given due to received traffic that may only confirm one way connectivity between the remote node and the local node (i.e. receiving a query, receiving new data, etc.). For TCP, the advice may be given when an acknowledgement is received for data that has not been previously acknowledged. UDP would not offer this advice at all, as it never knows that two way connectivity is available. However, higher layer UDP applications may give advice when they receive confirmation of two way connectivity. In many cases, the IP layer may not receive this type of advice about a communication. For instance, an SNMP agent may never receive a positive indication that its NMS is reachable. This applies to any responder in a query/ response system. I don't know to what extent this optimization has been implemented in current stacks -- Does anyone know if KAME implements this? I also don't know what API support, if any, is provided to allow UDP applications to provide this type of advice to IP. Anyone? Margaret > Will it be with all the packets sent from the upper layer or >do we have any mechanism like a setsockopt () so that the upper layer can >inform the IP about the forward progress? Please help. > > >Thank You in advance > >(Arun Jose) > > > >Do You Yahoo!? >Yahoo! Tax Center - online filing with TurboTax -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
