Not that this is an urgent concern, just a data point which shows that it doesn't just not work at the sites.
I had to restart the dhcpd server on Ottavia that allows us to talk to the camera. I then also changed the configuration script on the camera so that it no longer thinks ottavia is 184.108.40.206, but correctly 192.168.113.97. Overall took 5 minutes.
I also looked up services for Centos 5, and set it using the program serviceconf to start the DHCP server when Ottavia is rebooted now. That should head off future problems of that nature. For reference, to start the dhcp server manually, become root and type "service dhcpd start".