If I had a router that's connects my 2 LANs and there is a single DHCP, in the either LAN. How and what would be my configurations for the DHCP so that it provides the IPs to both the LANS through the router.
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You will need to configure the scopes for the 2 lans on the dhcp server and configure ip helper on the interface facing the lan without the dhcp server e.g.
if the dhcp server is on gi0/2 and address 192.168.2.10, your router config may look as follows:
ip address 192.168.1.1 255.255.255.0
ip helper-address 192.168.2.10
ip address 192.168.2.1 255.255.255.0
clients on the same lan as the dhcp server do not need the helper address
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