2 FAQ tagged "arp request"

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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 [...]
How to: Detect Duplicate IP Address With arping command under Linux :
Q. I run quite large network with different subnets. I’d like to know how can I find out duplicate IP address under Linux / UNIX?
A. You can use arpping command. The arping utility performs an action similar to ping command, but at the Ethernet layer. You can send ARP REQUEST to a neighbor host / [...]

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