There are many ISPs that are running to the outside world as the one IP. I just started using an ISP that does just that.
If you use the OpenDNS Updater and you get control of the IP you can set the access control. But once you leave the network it is likely someone else will gain control. When you get back, they may shut themselves and everyone else on that network using OpenDNS from whatever categories they decide to shut out.
My idea is :
OpenDNS could provide IP for two servers that did not have any access controls on them
Of course, I don't know your architecture, but you might even be able to configure your load balancing so that the IP resolved to existing servers, with the server coded so that if it was calling that IP address there would be no access control.
It could be something similarly simple.
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