[Server-devel] Network transparent XS services - limitations and alternatives
Joshua N Pritikin
jpritikin at pobox.com
Wed Aug 27 00:41:46 EDT 2008
On Tue, Aug 26, 2008 at 07:53:19PM -0400, C. Scott Ananian wrote:
> On Tue, Aug 26, 2008 at 7:40 PM, Martin Langhoff
> <martin.langhoff at gmail.com> wrote:
> >> http://wiki.laptop.org/go/Network_principles#Disconnected_operation is
> >> a principled means to substitute unavailable resources in the offline
> >> case.
> > The solution you suggest has problems, and I mentioned them in my
> > previous email. Have you got any light to shed on them?
> a) Don't lie about DNS entries when you are connected.
> b) When you are disconnected, use a DNS server which allows you to map
> names to short lifetime addresses, then serve resources for those
Maybe I don't understand the big picture, but just a & b seem
unworkable. Here is the use case:
Here I am in India with a wireless CDMA connection that typically
provides 50 kbytes per sec with 500ms latency. This is not fast enough
to olpc-update laptops from Cambridge. I must use xs-rsync, connected or
not connected. Or I must use a USB key. In the long term, I prefer to
use xs-rsync because of the promise of automatic updates to a large
number of laptops.
So here is a network service which must use the XS regardless of the
status of the internet connection and which should not interfere with
users browsing the internet or XS internet cache.
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