> would you mind posting your (sanitized) openvpn configuration, as well > as your bandwidth measuring method? > > i attempted this today and am seeing much less than 14Mbps. i'm probably > not measuring the same way, however, as i'm using a simple scp which > obviously has its own overhead - but does give me what i believe to be > a fair comparison (testing with and without vpn). > >
One end of the VPN is a Celeron E3300 w/ 4GB RAM and no crypto accelerator. There is 20Mbit metro-ethernet connection here that is being shared with about 300 PCs at a school. The other end is a Alix 2d13. The 2d13 has this config: --- /etc/hostname.tun0 --- up !/usr/local/sbin/openvpn --daemon --config /etc/openvpn/client.conf --- --- /etc/openvpn/client.conf --- client float dev tun0 proto udp remote w.x.y.z 1194 resolv-retry infinite nobind persist-key persist-tun ca /etc/openvpn/ca.crt cert /etc/openvpn/client.crt key /etc/openvpn/client.key tls-auth /etc/openvpn/ta.key 0 ns-cert-type server comp-lzo verb 3 engine cryptodev cipher aes-128-cbc --- --- /etc/sysctl.conf --- kern.usercrypto=1 --- --- iperf on vpn client acting as client --- $ iperf -i 2 -t 30 -c 192.168.176.1 ------------------------------------------------------------ Client connecting to 192.168.176.1, TCP port 5001 TCP window size: 16.9 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.176.6 port 4863 connected with 192.168.176.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 2.0 sec 2.62 MBytes 11.0 Mbits/sec [ 3] 2.0- 4.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 4.0- 6.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 6.0- 8.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 8.0-10.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 10.0-12.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 12.0-14.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 14.0-16.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 16.0-18.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 18.0-20.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 20.0-22.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 22.0-24.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 24.0-26.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 26.0-28.0 sec 3.12 MBytes 13.1 Mbits/sec [ 3] 28.0-30.0 sec 3.25 MBytes 13.6 Mbits/sec [ 3] 0.0-30.2 sec 47.4 MBytes 13.2 Mbits/sec --- --- iperf on vpn client acting as server --- $ iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 4] local 192.168.176.6 port 5001 connected with 192.168.176.1 port 13679 [ ID] Interval Transfer Bandwidth [ 4] 0.0-30.1 sec 51.8 MBytes 14.4 Mbits/sec --- Thank you, James Shupe
