Weird behaviour with multiple scopes and multiple VLANS

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hi,

we have central dhcp server multiple dhcp scopes (data 1 - 10.1.1.0, data 2 - 10.1.2.0 & data 3 - 10.1.3.0). have remote building 3 seperate vlans individual gateways (vlan 1 gateway 1, vlan 2 gateway 2 etc).

now our issue when laptop plugged vlan (1,2 or 3), picks ip address ( e.g. 10.1.1.50) - far. when we unplug laptop, ipconfig/release delete entry dhcp scope, , plug laptop into a different vlan it retrieves same ip address before (10.1.1.50).

the 3 gateways cisco routers , have been set usual dhcp helper addresses.

anyone got ideas why our laptops refusing let go of ip address once have issued dhcp?

any thoughts appreciated.


ok, may need "weeds".  you may consider taking packet captures before , after relay agent on vlan in question verify if dhcp packets being updated correctly relay agent.  there nothing else on dhcp server at.

i assume dhcp server has no interfaces on of these vlans.

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Windows Server  >  Network Infrastructure Servers



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