I have a Cisco ASA 500 on an Internet connection - coming through an xrio 400 ADSL bonder.
The problem is that the Cisco firewall - which has a static IP address - disappears completely and the Internet connection fails. It doesn't reply to PING requests to the public IP or to the 192.168.0.x IP address on the local LAN. The bonding device (an xrio UBM 400) gives an error saying that the link to the Cisco is 'incomplete' and it keeps sending ARP requests to the firewall which are not responded to. The device remains powered on all the time and I have checked all cables and replaced them.
I should say at this point that the Cisco is a new unit which was installed today to replace a Juniper Networks Netscreen firewall which demonstrated exactly the same behaviour.
I can't understand why the firewall just stops responding to PING requests - it has to be unplugged from the mains and then plugged in again in order for it to come up again. It will then PING and work correctly for a while. When it fails, I can't PING anything the other side of the firewall but the bonder continues to respond.
Any ideas about how to diagnose and fix this problem much appreciated.