-
sctp
SCTP Discussions
Text archives Help
- From: Qiaobing Xie <xieqb AT cig.mot.com>
- To: Deepak Rathore <rathore_deepak AT hotmail.com>
- Cc: discussion AT sctp.de, "Qiaobing.Xie" <Qiaobing_Xie-QXIE1 AT email.mot.com>, rrs AT cisco.com
- Subject: [SCTP-Discussion] Re: Query
- Date: Fri Mar 30 20:03:01 2001
- List-id: SCTP Discussions <discussion.sctp.de>
Deepak Rathore wrote:
>
> Hi,
>
> I have following queries related to SCTP, RFC 2960.
>
> 1. Why SCTP performs fragmentation of data chuncks when underlying
> layer (IP) does fragmentation ?
The reason is IP fragmentation is not good to the network performance
and therefore should be avoided as much as possible.
>
> What i understand after reading RFC is that since SCTP creates
> multiple streams with an association. These streams rely on underlying
> layer IP to travel across network. Underlying IP can have different
> MTU size. Now what SCTP does is it calculates minimum MTP size and
> breaks message into this min. size and transfers it over IP so that IP
> dosen't have to perform fragmentation. RFC also mentions that if SCTP
> does not perform fragmentation IP does it.
>
> 2. What is difference between comulative TSN ack. and gap ack block ?
Say, a receiver so far has successfully received TSN 537 and every chunk
before it but not TSN 538, then from the receiver's perspective, the
cumulative TSN is 537. If, in addition to this, the receiver also has
received TSN 540 and 541, then it reports 540-541 as a gap ack block
together with cumulative TSN 537.
> Thanks in advance
>
> Regards,
> Deepak Rathore
>
>
>
>
- [SCTP-Discussion] Query, Deepak Rathore, 03/30/2001
- Re: [SCTP-Discussion] Query, Andreas Jungmaier, 03/30/2001
- [SCTP-Discussion] Re: Query, Qiaobing Xie, 03/30/2001
Archive powered by MHonArc 2.6.19+.
