Need help with complex NAT setup with DHCP forwarding

Question

This is going to get a little crazy, so try to stick with me... Attached is a very crude network map to clarify as best I can...
I need my Cisco 831 to perform 1-to-1 NAT, but the Inside Global ('Black' LAN hosts as seen by the WAN) addresses must be assigned via DHCP from a DHCP server on the WAN. (This is the complex NAT part) The internal IP addresses would by assigned by the 831's DHCP.
In addition, the WAN's DHCP server must see the MAC address of the request as the one that belongs to the host on my LAN - Effectively, the WAN DHCP server should not be able to tell there is NAT going on. (This is the DHCP forward problem)
Any ideas on how to combine these tasks?
TIA,
-Chris Bowles, CCNA

Answer 1

Hi.
I don't think this is supported in alter table command. But you can code that inside an if statement which queries systables & syscolumns. Your code should be something like that:
if (select count(*) from sysobjects, syscolumns where sysobjects.id = syscolumns.id and sysobjects.name = 'some_table' and syscolumns.name = 'some_column') < 1
begin
    alter table some_table add some_column numeric(12) not null
end
This is an example..
Andreas.