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udp ports

HowTo: UNIX / Linux Open TCP / UDP Ports

How do I open the TCP or UDP ports under UNIX / Linux like operating systems?
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The portmapper assigns each NFS service to a port dynamically at service startup time. How do I allow legitimate NFS clients to access the NFS server using RHEL / Fedora / CentOS Linux 5.x iptables firewall?
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Question: How do I detect a DDOS (Distributed denial of service) / DOS attack on a Windows Server 2003 / 2000 / 2008? Can I use Linux netstat command syntax to detect DDoS attacks?
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Q. How do I find out which service is listening on a specific port? How do I find out what program is listening on a specific TCP Port?
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