SEND_ARP - Online Linux Manual PageSection : 8
Updated : Thu May 10 2001
Version : 4th Berkeley Distribution
NAMEsend_arp − tool to notify network of a new IP address / MAC address mapping
SYNOPSISsend_arp takes the supplied data and sends it out as an arp broadcast on the specified network device. This tool is mostly used by software (such as piranha) that manipulates virtual IP addresses and needs to notify the network that the device servicing an IP address has changed. send_arp [-i ARG] old-ip-addr old-mac-addr new-ip-addr new-mac-addr
DESCRIPTIONsend_arp sends out an arp broadcast on the specified network device (defaults to eth0), reporting an old and new IP address mapping to a MAC address. This is most useful in situations involving virtual IP addresses, where the network device servicing that address has changed, and other network arp caches need to be notified about it. All the data is specified in the command line and is simply passed along in an arp message frame. Since the old and new data specified can contain the same information, this tool can also be used to refresh arp caches or send periodic broadcasts. send_arp simply takes the specified arguments and places them in an ethernet arp broadcast.is a daemon used by pulse to monitor the running status of the specified services on clustered servers. This tool has NO error checking and should not be run without the direct supervision of pulse!
OPTIONS-iARG Optional. Indicates the network device to send the arp broadcast on. If omitted, the program defaults to eth0. old-ip-addr The original IP address (specified in nnn.nnn.nnn.nnn format) that the MAC address specified in "old-mac-addr" had mapped to it. old-mac-addr The MAC address that was servicing the IP address specified in "old-ip-addr". The MAC address is specified in hex, and can be formatted with or without colon (":") separators. new-ip-addr The new IP address (specified in nnn.nnn.nnn.nnn format) that the MAC address specified in "new-mac-addr" now has mapped to it. new-mac-addr The MAC address that is now servicing the IP address specified in "new-ip-addr". The MAC address is specified in hex, and can be formatted with or without colon (":") separators.
AUTHORsend_arp: Yuri Volobuev 1997
man page: Keith Barrett <kbarrett@redhat.com> 0
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