Re: [dccp] A quick question about sequence validity windows

[Eddie Kohler <kohler at cs.ucla.edu>]

Hi,

The sequence window does not affect data that has already been  
received and enqueued.  It should remain enqueued for the application  
until the kernel decides to get rid of it.

As for new packets that are older than the low edge of the sequence  
window: such packets should be processed according to the  
specification -- i.e., the receiver responds with a DCCP-Sync and  
otherwise ignores them.  Such data will NOT be sent to the application.

Eddie


On Nov 29, 2005, at 12:12 PM, Xiaofeng Han wrote:

> Hello
>
> I have a question about sequence validity window, and would greatly  
> appreciate it if someone could help me.
>
> If I understand correctly, the sequence validity windows will slide  
> forward if the receiver keeps receiving new data, because the GSR 
> (greatest sequence number increase).
>
> My question is, if this is true, some datagrams (old data around  
> the low bound of the window) may become out of the range of the  
> windows, in this case, what should we do about these data? drop  
> them or send them to the application layer?
>
> thanks
>
> xiaofeng