I agree,
increasing percentage of Internet nodes are mobile or "mixed" nodes, and
I cannot see anything that would stop this development. Thus, we will
see also more and more scenarios where there is simply not enough fixed
devices to successfully run the overlay. This makes it mandatory to
consider also mobile and mixed nodes as peers.
Mobile node as a peer is, however, a challenging scenario due to
following reasons:
-Most of mobile devices are behind NATs and/or restrictive firewalls
(already discussed quite thoroughly)
-The usage of mobile devices might be very transient (=>churn), as Henry
already pointed out
-Hardware capabilities are still restricted when compared to fixed devices
-Nodes have usually many network interfaces (3g, wifi, etc.), and
vertical mobility is common
-Limited battery capacity
These features set challenges especially to NAT/FW traversal, dynamic
peer selection, load balancing and energy-efficiency.
-Erkki
longbwe longbwe wrote:
What if most nodes of the overlay are mobile and there are not enough
fixed nodes running as peers?This is certainly becoming the case,with
the emergences of more powerful and smarter mobile devices such as
iPhone and GPhone, cell phones are functioning more like a small PC
and young people will prefer their mobile phones to laptops.
I also appreciate there could be a dynamic role transferring mechanism
between peer and client for one singal node regarding the changing
environments.
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