While we await more information from you, I may be able to find time this weekend to run some tests. I've got a topology in mind, which tests a local "server" with external users. If the test were reversed; where the local system is the "user", it would be nearly the same; this topology just includes port forwarding along with NAT.
Please let me know if you would be interested in this type of problem recreation / resolution, before I invest the time and effort:
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Five systems: An "internet user", two "ISPs", a "router", and a "server".
Four networks: an "Internet", between each "ISP" and the "router", and between the "router" and the "server."
Three tests: static provisioning, DHCP provisioning, and a NATted "server".
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