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i have two static ip. i want to configure both in my modem and want to map first ip with my server local ip?
i have two static ip. i want to configure both in my modem and want to map first ip with my server local ip and the second one with lan.for this i have to do one to one mapping and one to many mapping.in my modem ,in nat i m getting only virtual server,dmz host and port trigerring options.now how to do this.

it majorly depends on what you are doing to the server and what your gatway device is. on way to config would be to set you server up in the dmz (your lan may not be able to access it directly) configure all outbound port to be fwd from the dmz address to the public IP and all inbound ports from the public IP to the dmz address. i good recommendation just can not be made with out lots more info from you, but you can check out http://m0n0.ch/wall/ its an open source fw that i use. the site has some good info for you.