Slow OpenVPN throughput with Intel Xeon :-( only 1 Mb/s

[cbesener]

Hello,

I have setup 2 Opnsense with openvpn.

Both systems have a Intel Xeon processor with 16 GB Ram and SSD as harddisk. The Intel RDRAND engine is enabled.

I have configured a VPN witch AES256CBC und SHA256, but I wonder that the VPN speed is so bad. If I copy a large file the max speed is 1,5 Mb per second.

At one side I have a 1000 mbit sync fiber connection at the other side I have a 50 mbit VDSL.

What could I do, to speed up the VPN?

[iam]

I have configured a VPN witch AES256CBC und SHA256, but I wonder that the VPN speed is so bad. If I copy a large file the max speed is 1,5 Mb per second.

In both directions? Is the max speed 1,5 Mbit/s or MByte/s? 1,5 MByte/s would be good with 10 Mbit/s upload.

[Bonkerton]

Check with a large download from a known fast site, to see which side is the culprit for slow speed.

Or a torrent, like a Linux distro ISO

[cbesener]

The copy speed is about 1,5 Megabyte per second. Yes that is about 10 mbit. But I have a symmetric fiber channel with 1000 mbit, and on the other site 50 mbit. And I wonder that the VPN only pass 10 mbit. I would like to now how to speed up the VPN.

[mimugmail]

Interfaces : LAN : MSS, set to 1300 for testing. If it doesnt help its IPS, QoS, half duplex or something at other side

[ruffy91]

Try disabling rdrand so it uses aesni. rdrand is a lot slower than aesni or even software.

[cbesener]

After a little bit googling over the world I found a solution, which speed up my VPN to 40000 kbit's

I have changed the buffer size to this values

sndbuf 393216
rcvbuf 393216
push "sndbuf 393216"
push "rcvbuf 393216"

Thanks for your help

[Bargemanos]

After a little bit googling over the world I found a solution, which speed up my VPN to 40000 kbit's

I have changed the buffer size to this values

sndbuf 393216
rcvbuf 393216
push "sndbuf 393216"
push "rcvbuf 393216"

Thanks for your help

I ran into the same problem, although both internet speed should be sufficient to reach 100mbit without vpn active, i get ~1mb/s with vpn active.
I can not find an clue so i wanted to try the settings you provided above.

But i'm wondering, where did you set those variables. in the "openvpn --> servers" section or while exporting client side settings, of maby.. both? :)
I would like to get this right the first time.. would spare me a lot of possible travel time :)

[mimugmail]

Tunables, just Google them with FreeBSD to see absolute path

[cbesener]

I entered the values under client specific overrides. Than under Advanced Settings. Now my OpenVpn is fast, as I need.