I have a VPN appliance external network interface connected to a 10/100Mbs hub.
I noticed performance issues and that the VPN appliance logs demonstrate transmission error in the interface connected to the hub.
By default, the interface is set to 'auto' detection.
I hardcoded the configuration in the network adapter interface in the VPN gateway to 100Mb/s, half-duplex, since hubs do not support full-duplex operation.
However, tranmission errors persist and performance is poor.
Is there any technical explanation on why even setting up this to 100Mbs, half-duplex did not match Ok with the hub?
Is the only solution for this replacing that hub with a switch?
The device your thinking of is a tap. Fluke have them, last time I looked.
How about replacing that hub with a decent switch ? Not much we can suggest since you only have one side you can manage and you've done all possible combinations. The hub must go if you want better performance.