I have a situation with a Docsis modem and a SonicWall router. There are 5 IP's connected to the SonicWall. Every once in a while the IP's get knocked off the air. The only way I can get them working is to reprogram everything from scratch. I have tried various things including a brand new SonicWall router which did not work. I have had SonicWall tech support do some testing as well. What we notice is that when we reprogram everything from scratch we send out an ARP request and the ISP responds appropriately. However once an IP goes down we notice that if we send an ARP request out we get no response. Is there any definitive way to prove that the problem is either at the ISP end (which is what we suspect as this is a new service offering they have) or at our end? The ISP is recommending that we go to transparent bridging but we have reasons not to and they have also confirmed that it should work without transparent bridging - they are just 'trying to make it work' but again we don't want transparent bridging - not until we have at least determined which end the problem lies.