E_G_R2 Posted November 30, 2020 Posted November 30, 2020 OK quite easy if you are using the same IP address for the new server. Just backup from one then restore to the other. But I want to use a different IP address for the DHCP server so for example old one is 10.0.1.100 and the new one is 10.0.1.105. Brain freeze, how do I get the workstations to recognise the new server IP?
thebatman Posted November 30, 2020 Posted November 30, 2020 Not tryed it, but I would backup from one, then restore to the new one, the PC should pic up the new IP address of the DHCP server when they next ask for a new IP address.
E_G_R2 Posted November 30, 2020 Author Posted November 30, 2020 Not tryed it, but I would backup from one, then restore to the new one, the PC should pic up the new IP address of the DHCP server when they next ask for a new IP address. That didn't happen. I've usually just re IP's the new server with the old server IP but in this instance need to keep the old one. New devices were unable to obtain and IP address.
msi_school Posted November 30, 2020 Posted November 30, 2020 It should be an issue on a flat network because the DHCP request is a broadcast, if you have VLANS you will need to add the servers address to the DHCP helper on the core switch.
Davit2005 Posted November 30, 2020 Posted November 30, 2020 (edited) That didn't happen. I've usually just re IP's the new server with the old server IP but in this instance need to keep the old one. New devices were unable to obtain and IP address. If this is a Windows DHCP in a domain Is the dhcp server authorised in AD, this should be obvious as the DHCP service should not start. And yes if you have any DHCP relays or different vlans then the ip helper addresses will need to be updated as @msi_school mentioned otherwise DHCP discover step will not get to the DHCP server. Edited November 30, 2020 by Davit2005 1
FN-GM Posted December 1, 2020 Posted December 1, 2020 But I want to use a different IP address for the DHCP server so for example old one is 10.0.1.100 and the new one is 10.0.1.105. Brain freeze, how do I get the workstations to recognise the new server IP? If you use VLANS - You need to change the IP Helper Address on your switches. If you don't - Clients will automatically find the DHCP via broadcast. 2
msi_school Posted December 1, 2020 Posted December 1, 2020 It should be an issue on a flat network because the DHCP request is a broadcast, if you have VLANS you will need to add the servers address to the DHCP helper on the core switch. *Should not* I must proof read my posts
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