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HowTo: Linux Send a Gratuitous ARPs Requests [ Networking ]

How do I send gratuitous ARPs under Linux? How do I tell my DUMMY router that the IP is over here now, under Linux operating systems?
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Router ARP Cache is Not Releasing Linux / UNIX Server IP address

Q. Recently we made changes to our server hardware and swapped all IP address from old to a new server. However, 2 IP addresses are not get updated due to arp cache issues (IPs are cached on the router). They are going to other servers. How do I solve this problem under Redhat Enterprise Linux version 5.0 or any other Linux distribution?
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