Hi,
I am pulling my hair here:
- my opnsense box ignores what's in its ARP table for traffic from the box itself. It send the the layer 2 address of another host on the same network.
- for traffic coming in through my opnsense box, for the same destination, it uses the correct layer 2 address.
What can cause this? What can I look for?
Here are some exhibits:
the ARP table
the routing showing the gateway
tcpdump for a ping origination on the opnsense box and for a ping coming through the opnsense box
hardwiring the gates MAC into the arp table doesn't change the behaviour.
Many many thanks for any help
Frank