OPNsense

10G Speeds

When you set an OPNsense system up with supported 10G cards, say the Intel X540-AT2, you can move 6 to 8 Gb a second. Though this is better than in the past, but not line speed.

# iperf between two systems routed through a dial NIC on OPNsense

[ ID] Interval       Transfer     Bandwidth
[  1] 0.0000-10.0040 sec  8.04 GBytes  6.90 Gbits/sec

This is because the packet filter is getting involved. If you disable that you’ll get closer to line speeds

Firewall –> Settings –> Advanced –> Disable Firewall

[ ID] Interval       Transfer     Bandwidth
[  1] 0.0000-10.0067 sec  11.0 GBytes  9.40 Gbits/sec