All dynamic MAC addresses are lost at reboot. Use undo port-security mac-address dynamic to restore the default.īy default, sticky MAC addresses can be saved to the configuration file, and once saved, survive a device reboot.Īfter you execute the port-security mac-address dynamic command on a port, you cannot manually configure sticky MAC address, and secure MAC addresses automatically learned by the port in autoLearn mode are also dynamic. This function converts sticky MAC addresses to dynamic, and disables saving them to the configuration file. Use port-security mac-address dynamic to enable the dynamic secure MAC function. Layer 2 Ethernet interface view Default level But I could not find a way to get an IP address from a MAC address.Undo port-security mac-address dynamic View It will be very nice if I can use the same method on Mac, Linux and Windows machines.Īs far as I know, I have to broadcast a ARP packet to the network in order to retrieve a MAC address from a known IP address. I would like to know how to retrieve the IP address in a more sophisticated way. Find the known MAC address and the corresponding IP address from the list.Execute arp -a to print a list of IP and MAC addresses.Execute ping command ping 192.168.0.2 (NOTE: the instrument does not respond to ping).But I need to know the IP address before opening a socket (WinSock on Windows, sys/socket on OS X and Linux).Ĭurrently I use a very dirty way as shown below. I would like to write a C/C++ application which talks with the instrument using a socket connection. I know the MAC address of the instrument, but please assume that its IP address is unknown. The PC and the instrument are directly connected over a UDP socket with a CAT5 cable.
In my case, there are only two devices: a very normal PC (192.168.0.1) and a scientific instrument which has an arbitrary IP address (192.168.0.xxx) hard coded in its ROM. I am looking for an easy way to convert a MAC address to the corresponding IP address in a local network.
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