said by JPedroT:Have the USG been configured to use that IP as its WAN1 IP?
No. We've not been using that IP address for the WAN-interface. It's a completely other, recieved from DHCP.
said by Brano:First update your firmware to current version 3.30(BDR.5)
Next check your startup-config.conf whether the MAC got somehow hard coded there.
Then post entire output from:
show arp-table
and
show ip route
We did upgrade to BDR.5, and the same problem was there. We did a factory reset, and then restored the configuration file and the same problem. Once we removed the two lines containing the ip-address, one for address object and one for firewalling, it worked.
It seems that a bug has been found, but I cannot recreate it. I cannot see why it would create a Direct Route (kernel) from that address.