Really weird, it seems the Router is indeed sending its MAC address to the PIX.For some reason this PIX is not receiving or processing this message.Have you tried setting up a static ARP entry on the PIX?Something like:INSIDE2 192.168.100.2 0011.bba2...
Sure,For the debug ARP I would recommend you to try it meanwhile trying to ping from one device to the other (PIX to RTR and viceversa).To disable the debug just issue "und deb arp" or "und all"Here is the capture you can try:capture arp ethernet-typ...
Hey Ronan,Have you tried a debug arp?What do you get?Also what would happen if you use a different port of the PIX to try the same kind of connection?I understand that you applied a capture, was it an Ether-type capture for ARP?