[CentOS] OpenVPN throughput

> We are working on setting up two private networks linked by a public
> network which is fast (1 Gbit/s) but potentially insecure. Since the
> hosts on our two networks need to talk to each other, and do so
> securely, we have decided to use OpenVPN to connect them, making one
> gateway a server and the other a client. The connectivity part was
> easy to establish and worked like a charm. The only problem was, and
> is, performance.
>
> We have two old PIII-class machines that are being tested for the role
> of the gateways. We have put new 1 Gbit NIC's in them and they work

Why you are using such a antique hardware?

--
Eero