Just a recap here.
Everything on the firewall looked fine. Tested PCA connectivity to from here in the midwest and it did not work.
It appears to be a PCA/HAIKU issue with the dot zero public IP address.
PC80 is currently requesting from CS at Time Warner to getting another public IP address (above 0). Basically a reset and request of a new DHCP address from the ISP.
In theory, all IP addresses are the same, and you can allocate them at random without a problem. 192.168.1.2 is certainly not better or worse than 192.168.1.15, right? But, in practice, certain IP addresses are regarded as "special" by some implementations and do not yield the same user experience. This is the case for the "dot-zero", IPv4 addresses in which the last byte is zero.
The problem described here has initially been brought by Xavier Beaudouin: If a provider assigns a dot-zero IP address to a customer, is this a disservice to the customer? The last byte of a dot-zero IPv4 address is null. It is not a network address, unless the prefix length happens to be 24. For instance, in the prefix 10.1.128.0/23, the address 10.1.129.0 is a host address, It is a dot-zero address, but not a network address. In theory, this address is perfectly legitimate and should work without any problem. But is it?
IPv4 addresses ending in ".255" can raise similar questions as described in this Windows bug.
We developed the following methodology: We took a list of networks of which each network had a dot-zero IPv4 address and a "normal" one (not ending in .0 or .255) in the same /24. Some networks also had a .255 address. All addresses must respond to ICMP echoes (ping). Those devices that didn't, were automatically excluded from the results.
The important discovery is that it seems that there is a difference between targets whose IP addresses are in the former class C space (from 192.* to 223.*). In these cases, the failure rate is 4%, where it is only 2% for the other addresses. So, whatever the bugs are, they seem related to classful code.
So, no, not all IP addresses are equal. Having a dot-zero address is a disadvantage, specially when it comes out of former class C space. One may wonder if network administrators should avoid these addresses.