[Sis-csi] Telecon today, 10/12 @ 3:30PM EST

[Scott, Keith L.]

Right, and this was in fact the genesis for some rather odd addressing
schemes that have been proposed in other venues, such as placing all of
the 'space-facing' interfaces into a single subnet.  Things get sticky
when you want to communicate from the ground directly to S/C1 or if you
want to use S/C2 as a relay to get to S/C1.  I'd prefer some solution
that didn't involve renumbering interfaces on the fly (ICK!).
 
The unnumbered interfaces idea might be really good, especially since I
haven't heard anybody proposing anything except serial data links
between space and ground or between spacecraft.  I'm a bit leery of
anything that requires bidirectional connectivity (like negotiating
link-local addresses) as bidirectional connectivity's not necessarily a
given.
 
I also don't think we're necessarily tied to what commercial routers
allow or don't allow; though knowing when we're in/out of the bounds of
commercial implementations is VERY useful.
 
        --keith
 


________________________________

	From: Ivancic, William D. (GRC-RCN0)
[mailto:william.d.ivancic at nasa.gov] 
	Sent: Thursday, October 12, 2006 9:51 AM
	To: Scott, Keith L.; sis-csi at mailman.ccsds.org
	Subject: RE: [Sis-csi] Telecon today, 10/12 @ 3:30PM EST
	
	
	Traditionally routers have to be on the same network.   This
creates problems for space-based networks - particularly if one wishes
to share infrastructure.   We are seeing similar issues in aeronautics
network centric operations.   Some thoughts that need investigation
are:
	 
	Can one use unnumbered serial interfaces to connect routers?
This would allow router interfaces to not have to be on the same
network.  I think we tried this and it did not work, but we haven't
tried to hard due to manpower and money.
	 
	Can IPv6 link-local addressing help?   I haven't had the
opportunity to see how IPv6 can help.   Auto-configuration may also be
a solution.  I know of one company that was looking at dynamic NEMO
techniques that use some IPv6 capability to some interesting dynamic
things (no home agent required).   I will see if I can find the
Internet Draft is one exists.
	 
	 
	Will
	 

	******************************

	William D. Ivancic

	Phone 216-433-3494

	Fax 216-433-8705

	Lab 216-433-2620

	Mobile 440-503-4892

	http://roland.grc.nasa.gov/~ivancic
<http://roland.grc.nasa.gov/~ivancic>  

	 

________________________________

	From: sis-csi-bounces at mailman.ccsds.org
[mailto:sis-csi-bounces at mailman.ccsds.org] On Behalf Of Scott, Keith L.
	Sent: Thursday, October 12, 2006 8:44 AM
	To: sis-csi at mailman.ccsds.org
	Subject: [Sis-csi] Telecon today, 10/12 @ 3:30PM EST
	
	
	12:30 Pacific
	3:30 Eastern
	 
	NEW NUMBER: 703.983.6338 (703.983.MEET)   [It's not my fault]
	 
	I'd like to talk about plans to get the first set of
specifications going, starting with addressing and routing plans.  Come
armed with your thoughts on what routing protocols might be appropriate
where, how we might want to break things into CIDR blocks, etc.
	 
	        --keith
	 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ccsds.org/pipermail/sis-csi/attachments/20061012/69633db3/attachment.html