NSA 220 "Arping entire block"

After a physical move our service provider has assigned us two new static IP addresses. We are having difficulty getting any traffic whatsoever to the second address.

• Countless hours this week on phone support with Cox who blames the Sonicwall. The are saying our Sonicwall is ARPing the entire block (proxy arp?).

• We've done Webex sessions where the Sonicwall team pored over every setting in our router and is blaming our service provider. They say that ARPing the entire subnet is correct and that traceroutes to the two IP addresses hint at a reason for problems.

Our assignment from Cox looks like this:

• IP1: x.y.z.75
• IP2: x.y.z.93
• Netmask: 255.255.255.224
• Gatewak: x.y.z.65
• DNS j.k.28.16, j.k.29.16

I have one network interface defined with those settings. I am able to NAT on our first IP1 address object but I am not able to NAT on our second IP2 address object.

Also the traceroute to the two different IP addresses takes different paths for the last three hops with out second IP never responding.

We are absolutely at our wits end. I think our only remaining options are:

• Do a conference call with Cox and Sonicwall (as offered by Sonicwall)
• Request Cox to assign new IP addresses in the hopes that they get the correct routing
• Hard reset the router in hopes that the "one small setting somewhere affecting the proxy arp" get sets correctly

Any advice or reflections would be greatly appreciated here. Thank you