Connection problems between Access Point and Ubuntu

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http://askubuntu.com – I have an access point already configured (with another AP and it's 3 IP cameras) and I can get in with a WinXP laptop (by AP's IP address) who is wired connected, directly to the AP. Now, I want to mount an Ubuntu computer to stay connected as my laptop is. There is not any difference, only OS. First of all, I was trying to get in the AP (via browser and AP IP addr) like this: AP and Ubuntu desktop connected to a switch, and this connected to a router (The IP address of the AP is static). With this, I can't get in to the AP. Even so, writing in terminal nmap -A -PN, I get th (HowTos)