OpenVPN Tun/Tap speed on linux

mamyxk

Hi,
I've been looking for a solution for this problem, but never found one. I have OpenVPN server on VPS with CentoS 7. When OpenVPN creates new tun/tap device it sets its speed to 10Mbps. What I'm trying to do is to set this value bigger. 100Mbps would be fine. I tried using ethtools but unfortunately by default these tun/tap devices don't support any speed other than 10mbps.
Is there any solution to set this value bigger or make it support other values?

TinCanTech

As far as I am aware, that 10mbps is only a value in a field it has no effect on the tunnel speed.

Otherwise we would have people screaming from the roof tops, I expect..

mamyxk

Settings for tap02:
        Supported ports: [ ]
        Supported link modes:   Not reported
        Supported pause frame use: No
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 10Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
        MDI-X: Unknown
        Current message level: 0xffffffa1 (-95)
                               drv ifup tx_err tx_queued intr tx_done rx_status pktdata hw wol 0xffff8000
        Link detected: yes

That's what ethtool says about tap adapter and it doesn't support other speeds.
There are many threads about this problem, but I haven't find any solution in few days.

TinCanTech

TinCanTech wrote As far as I am aware, that 10mbps is only a value in a field it has no effect on the tunnel speed.

Otherwise we would have people screaming from the roof tops, I expect..

Do you understand ?

What speed is your internet ? What speed do you get with openvpn tunnel ?

Pippin

They see a problem where there is none...

mamyxk

I get this 10Mbps with openvpn tunnel or around 8,6-9Mbps to be precise (encryption etc.)
VPN Server has 1Gbps link and this 10Mbps tap02 vpn interface.
My VPN Client is on windows where i've got around 150mbps from isp and WINDOWS adapter limited to 100Mbps (its default).

My problem is I cannot set higher speed for tap interface on cecntos server

TinCanTech

mamyxk wrote My problem is I cannot set higher speed for tap interface on cecntos server

That is correct .. you cannot set higher speed for tap interface on *any* operating system. :ugeek:

mamyxk

What do I do then? Can I make other virtual interface and set its speed higher?

TinCanTech

mamyxk wrote Can I make other virtual interface and set its speed higher?

A virtual interface cannot magically go higher than the physical interface ..

mamyxk wrote What do I do then?

Probably have to pay for better internet etc.

Please see:
https://forums.openvpn.net/viewtopic.php?f=30&t=22603

mamyxk

My physical interface is 1Gbps so its way higher than 10Mbps.