http://stormwdumgah7rpl6fdj4yhrl2i2a7j3bkzyjcv5qxk3a6253n22thyd.onion/blog/port-striping-v2
We decided to call this feature "port striping". Fast forward to a few years later. OpenVPN 2.4.0 finally gets released, and with it came support for Elliptic Curve Cryptography . We wanted to offer this to our customers, but because of our "port striping" rules the only way to do that would have been to buy twice as many IP addresses, or set aside a port just for these new ECC instances.