Pinging does populate the arp table, so if I ping sweep, I would be pinging every address, whether there is a device associated or not. like in Windows 'arp -d'? I will need to do this (I assume) in order to no longer have the 'old' IP associated to the MAC address (zombie entry) before parsing for the 'new' IP?Broadcast pinging does not seem to send arp requests so does not populate the arp table.Frennzy, ok I think I got it, thanks. Incidentally, does anyone know if there is an arp parameter to delete the entire table in Linux.

so the 'new' IP is not in the arp table, but I do have the MAC address. there was recently traffic, so it is in my arp table, but then I change the IP to use DHCP instead of a static address.

no, I'm referring to ping sweeping, not pinging a broadcast addres.that is, ping each address in your subnet, incrementally.There are numerous tools that will do this for you.įint, ya see there is where the problem lies. Could there be a terminal command to display this lease table in Linux from my router?I was thinking maybe using Dynamic DNS and that way I could simply just use the host name of my device whether it has a static IP or using DHCP? But to do this I believe I would need to setup a server system to act as the DHCP and DNS server?I appreciate your ideas.

I can see the DHCP lease table through the web GUI to my router (and possibly some CLI commands to the router) but I would like to keep my scripts generic enough that they would work on other networks with different DHCP servers. Quote:Originally posted by Mako22:Hey Frennzy,When you say Ping sweep the subnet, are you referring to broadcast pinging? ie: ping -b 192.168.20.255 to find all the devices on subnet 20?Broadcast ping does not seem to use arp requests and therefore does not update the arp table.My DHCP server is running on my router.

How to get your mac address in linux