This maybe a dumb question but is it possible to determine the range of addresses in a dhcp pool without access to the dhcp server? I.e. from a client.
We have a private network on a managed internal network in the range 10.100.19.0 255.255.255.0 and I'd like to set some ip addresses statically, but don't know which addresses are not included in the dhcp pool, and don't have access to the dhcp server, do I have any option other than wait for the admin to get back to me?
Best Answer
No, not without seeing the configuration.
You receiving an address inside of 10.100.19.0 255.255.255.0 doesn't mean the entire range is going to be used. The administrator could have done any range within that subnet.
Example: 10.100.19.10 - 20, or 10.100.19.100-254.
Typically one or more addresses will be reserved for network connectivity for that subnet. i.e. the typical ".1" you use for your gateway, or if he has something like VRRP setup, maybe he has .1 .2 and .3 reserved.
Also, if you're looking to take some IP's from that pool, definitely have him assign the addresses to you. If you set 10.100.19.25 for your device, and it goes down later, theres nothing preventing the DHCP server from giving that address away to something else.