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Linux: Find Out Which Process Is Listening Upon a Port

How do I find out running processes were associated with each open port? How do I find out what process has open tcp port 111 or udp port 7000 under Linux?
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Verify: Keepalived IP Failover Working Or Not With tcpdump Command

I've installed keepalived IP failover software as described here. But how do I verify it is working or not?
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Ubuntu Linux: Find Out Default Gateway

How do I find out default gateway IP address (default router IP assigned) for my Ubuntu Linux systems?
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