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I want to create 14 subnets (10.10.10.0/23, 10.10.20.0/23, 10.10.30.0/23, etc) I have a DHCP server running on a 15. subnet, 10.100.10.0/24 with the address of 10.100.10.100.

The problem that arises is that when I create more than 1 scope in the DHCP-server, the leases start moving from the DHCP-server table, and into the router DHCP lease table. I can also see that the leases provided have DNS from the router, and not the windowsserver.

Does anyone have any idea what this "fault" is?

-I have configured all interfaces except "the 15. subnet" with relay agent on the router pointing to DHCP-server address. Switches are also configured with IP-helper address that point to the DHCP-server. there are no other DHCP service activated in the network, or any networks except for the windowsserver.

Thanks in advance.

EDIT:

I have checked on client that DHCP and DNS "server" is listed as Gateway. this I find very strange as all interfaces except the one with DHCP-server is on is enabled as Relay agent only.

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  • show us how your network is working, having 2 dhcp in the same network is not possible without seperation in any kind Commented Sep 12, 2024 at 15:59
  • Does anyone have any idea what this "fault" is? - Yes. You have 2 DHCP servers. Turn off the DHCP server on the router. Commented Sep 12, 2024 at 16:52
  • But I already have... I have a teltonika router that you set DHCP to either disabled, Relay, or Enabled on each interface. I have disabled DHCP on DHCP-server network, and added Relay on the interfaces for the other networks. Only interface DHCP is active is in WAN network (I dont have a static public address on the router) Commented Sep 13, 2024 at 4:59
  • I have finally isolated the error. everything works great aslong as I only have one interface on the router activated with relay. the second I change interface configuration on another subnet to relay instead of disabled, I get assigned DHCP configuration from the router and not the winserver. if I disable all the scopes on the winserver, I get no ip configuration on any subnets. Commented Sep 13, 2024 at 9:38

1 Answer 1

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The fault was caused by missing IP-helper address on the "core" switch. (I had to setup interface based relay, vlan based was apparently not enough). works as intended now.

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