I am facing problem with one core switch L3 and two L2 switches catalyst-2960. the problem is, when i connect any wireless nano

[roohullamin1]

I am facing problem with one core switch L3 and two L2 switches catalyst-2960. the problem is, when i connect any wireless nano router(it has own DHCP) to these L2 switches then any one connect his laptop to L2 switches catalyst-2960 via Ethernet port, the laptop is now receiving IP address from that nano wireless router instead of core switch DHCP server.(in this network there is no any VTP server or client, just DHCP and Vlan 1) 

[Jeff Van Houten]

Dhcp clients send broadcasts. If all dhcp servers are in the same vlan, whichever answers first will supply the address.  You can consider creating separate Vlans for wired and wireless or you could shrink the available addresses that each server can supply so that are no overlaps.

[Sebastian Helmer]

Yes it true what he said. Why are u doing that by the way? U can also enable dhcp snooping to prevent that.

[Sajid Ali · Accepted solution]

Hi roohullamin1,

This is a very basic issue that every LAN administrator face, just disable DHCP server from nano and cascade in existing scenario, now your laptop and other devices that are connected to network via nano will get IP address from Core Switch DHCP server.

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Sajid Ali Pathan