nic: Something Wicked happened! ffff

It appears your Sundance 10/100 NIC is old, perhaps too old...

See https://bugzilla.redhat.com/show_bug.cgi?id=748973 (f16 Sundance 10/100 Ethernet module crashes when plugged into gigabit router)

Per your ethtool output, I notice enp1s6 is not reporting as supporting auto-negotiation. Is that disabled on the device/port you are connecting too? If possible adjust the device you are connecting with to have auto-negotiation enabled. If you don't have access to that device, or you don't want to change it, then you may have to force a speed/duplix on enp1s6.