@gimpymoo
I have a custom built appliance, specs as below:
Intel G5400
4GB RAM
SSD
Intel Dual GB NIC
If these are still your system specs, simply swapping the Intel Dual GB NIC for something like this will do it. Unless you've got extra card slots, then just add one for some extra ports.
https://www.newegg.com/p/pl?d=intel+x540+dual+port+10gbe+nic
Just watch out for counterfeit cards...