Networks

I am having a dataone connectivity with static IP. I need to connect this to my server throgh CISCO router. I am able to configure in for accessing Internet by putting ADSL modem in PPOE mode with username and password assigned in the modem, and by natting the CISCO router. But this does not work for incoming accesses.
Can anybody help by informing how to configure cisco router to directly accept Static IP when ADSL modem is in bridge mode.
thanking in advance