[afnog] NREN Network Design

[Stephane Bortzmeyer]

On Mon, Feb 01, 2010 at 10:04:07PM -0500,
 Tarig Yassin Adam <tarig at suin.edu.sd> wrote 
 a message of 597 lines which said:

> hi phil

[And thanks for forwarding this discussion where it belongs. It is sad
that a discussion on an african NREN was first carried to a North
America list.]

> We already applied to AfriNIC, they allocated to us /18 ipv4 we're
> using two ISPs to connect to our customers and the same time we're
> using these ISPs for the Internet.

And you use BGP? You have your own AS?

> The ISP using tunnel layer 3. 

I am sorry, I cannot parse this sentence.

> For customer sites to reach our NOC they need next hop to the ISP
> routers which we do not have a control. 

The way I understand it (you are really short on details), the
universities are your customers and there is always an ISP between
NREN and UNI:

+---------+
|	  |	    +---------+
| NREN    |---------| ISP 1   |------- UNI 1
+---------+	    +---------+		    
     | 	  	       |       \
 +--------+	       |       	\
 | ISP 2  |    	  +-----------+	 \
 +--------+-------| Internet  |	  +--------+
   |   	  |   	  +-----------+	  |  UNI 2 |
   |   	  |    	       	       	  |    	   |
+------+  +-------+    	       	  +--------+
|UNI 3 |  | UNI 4 |	       		    	   
+------+  +-------+	       		    
	   
	  
Is my schema OK? If no, please provide yours. If yes, I wonder, what
service provides the NREN if no connectivity? If you just provide
Internet servers (HTTP, XMPP, etc), there is no need to "tunnel"
anything over the ISP.