Hi team,I just encounter a problem of DHCP.Here is the question:


I have a DHCP server in the env,and I set a subnet which contain 200 IPs in the DHCP configure file.The lease time is 1 hour.There are 180 vms using the dhcp server.By some mistakes,the DHCP server is down and out of service with two hours,so the vms can not renew the lease .At this moment ,the DHCP has been recoverd,what confuse me is that if I create 10 new vms in this DHCP env,whether these new VMS will occupy those IPS which have been assigned to those previous 180 VMS or the new vm will be assigned a new IP of the rest of twenty.
Any help is appreciate.

I believe this is technically at the discrepancy of the server itself, and different servers might take a different approach. However, in my experience as the DHCP server knows that there is a lease out for a given address it will not give it out again if it can find another address.

Thanks a million.I will take a look at the RFC of dhcp to find some clue.

The more I think about it, the less sense it makes to reallocate it. A client that is still online will not constantly confirm it still wants the lease. I think RFC on that says that will renew the lease halfway through the lease duration. So outside of that, there'll be no communication between the original client and the server, so might as well not be there...

Classic reason, tho', for having more than one DHCP server in-tandem on more than one box.

how so?