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Packet Header




I have a TCP connection  between a source and sink.


SRC ------------ INTERMEDIATE NODE ---- SINK
				     ^
				     |
				  Link Fails


If the Link between the Sink the Intermediate
node fails, I want the  Intermediate node to
inform the SRC that said link has failed. How
do I go about doing this?

Do I need to form a new packet header for 
signalling the link failure?  I read the 
chapter on Packet Headers & Formats in 
nsDoc.

Are there any methods in OTcl to send  
a packet/signal from one node to another?

Can I (in OTcl)  read the contents
of a packet Header?


Gopal