how many users at once

johnDB

hi,

I’m running Openvpn on an Openbsd server and have been for years. The setup is on an i3 with 4 Gb of ram. Users connect to the Firewall and then use remote desktop to control their office workstations.

With the Corona virus outbreak, my clients are concerned that everyone will have to work remotely and can the firewall handle 20 inbound connected at the same time. From my perspective, the heavy lifting will be done by the internal workstations and the traffic back to their home computers will essentially be video and keyboard / mouse input.
Do I have anything to worry about?

TinCanTech

johnDB wrote With the Corona virus outbreak

First mention of it :mrgreen:

johnDB wrote Do I have anything to worry about?

Yes.

Q: Will your network cope ?
A: No idea

Pippin

For OpenVPN It comes down to the hardware, CPU speed and AES-NI support.
And as pointed out already the bandwidth required to support your 20 streams.

To find a ballpark figure what your hardware is capable of, you could do

openvpn --genkey --secret /tmp/secret
time openvpn --test-crypto --secret /tmp/secret --verb 0 --tun-mtu 20000 --cipher aes-256-cbc

Replace the --cipher value with your configured/negotiated one.

3200 / execution time = ballpark figure in Mbps

For execution time take the real (highest) number.

johnDB

so I get this:
0m05.27s real 0m05.24s user 0m00.03s system

3200 / 05.27 = ?
I'm not sure what this is telling me?

Pippin

In math the "/" means, divide.
3200 / 5.27 = 607 Mbps
That's a ballpark figure of what your server would be capable of.

TinCanTech

Pippin wrote 3200 / 5.27 = 607 Mbps

Why 3200 ? 😉

Pippin

It's a magic number 😉

TinCanTech

Pippin wrote It's a magic number 😉

My crystal ball says otherwise 😃

TinCanTech

This does feel like it should be in "Server Administration" to me.

FTR: 32Gbit must be the openvpn test sample.