On 07/22/2014 08:39 AM, Edward Ned Harvey (lopser) wrote:
From: Derek Balling [mailto:[email protected]]
Sent: Tuesday, July 22, 2014 10:02 AM
By VPN'ing into a different network you are -- by definition -- getting traffic
to and from Netflix via a different peering-point,
Smart thinking. Here is my counter: Tonight, I will set up two laptops. One
VPN'd and the other not VPN'd. I'll sniff the traffic and see if it's coming
from the same IP address. If it's not coming from the same IP, I'll retry,
retry, retry, until I can get two video streams both coming from the same IP,
with the only difference being the existence or non-existence of the encryption
relay (VPN network).
If all other things are equal, the VPN network should be equal or worse than
the regular network, because the VPN is forcing an extra hop and adding
overhead both in terms of latency and payload.
You presume that the route is longer. It might not be. They are very
different. Traceroutes will tell the tale. In addition, the different
routes may have different bandwidths and congestion in the various hops
in the route.
What you know for sure is that you are sending the data through
different routes and that you're getting different results. That much
is a fact.
The extra encryption/decryption consumes more CPU - but it need not have
any measurable effect on data throughput. Encrypted data is pretty much
the same size as unencrypted data. Latency is largely irrelevant for
streaming.
You need to distinguish between facts (like the different routes) and
hypotheses -- and figure out what your hypotheses are and how you can
test them.
But I'd start with traceroutes (if you can get the data).
--
Alan Robertson <[email protected]> - @OSSAlanR
"Openness is the foundation and preservative of friendship... Let me claim from you
at all times your undisguised opinions." - William Wilberforce
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