I'm reading up on performance for different encryption types.
On my systems I can see the differences in speed you get with running
openssl speed ...
In the initial OpenVpn config that I was given for the Server I'm using there's
auth RSA-SHA512
auth-nocache
cipher AES-256-CBC
ecdh-curve secp521r1
tls-cipher TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384
So I set my client to start with the same config.
Everything works.
As a simple test to increase the speed of downloads across the vpn, I dialed
down the security a little by switching both ends to
auth RSA-SHA256
auth-nocache
cipher AES-128-CBC
ecdh-curve secp521r1
tls-cipher TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256
But when I do a comparison of throughput, just by downloading big files over
the VPN link, I can't measure any real difference.
Did I misunderstand how to improve performance by using lighter, smaller
crypto? Maybe missed some other settings?
Or is it just that crypto size isn't my bottleneck?
- John
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