[dccp] A quick question about sequence validity windows

[Xiaofeng Han <han at mail.eecis.udel.edu>]

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