I have a cisco switch 2960S with 2 vlans 2001 and 2002. On vlan 2001 runs a DHCP server (Windows Server 2012 R2) with ip 10.0.100.10 and a scope for vlan 2001 (10.0.100.50-99/24) and 2002 (10.0.200.1-99/24). For testing I used the following configuration (simplyfied):
vlan 2001,2002 ! interface GigabitEthernet0/1 description *** Client network *** switchport access vlan 2001 switchport mode access ! interface GigabitEthernet0/2 description *** FEMTO indoor box *** switchport access vlan 2002 switchport mode access ! interface GigabitEthernet0/3 description *** Uplink router *** switchport mode trunk ! interface Vlan1 no ip address no ip route-cache ! interface vlan 2001 ip address 10.0.100.1 255.255.255.0 ! interface vlan 2002 description *** DHCP relay *** no ip address ip helper-address 10.0.100.10 no ip route-cache ! ip default-gateway 10.0.100.254
Now I have a real strange situation, if I connect a notebook or pc to port 2 on the switch - I get an ip address from the DHCP server in range 10.0.200.1. That works like designed but if I connect the FEMTO indoor box to the same port on the switch I dont get any ip address. I reset the FEMTO indoor box like the supporter told me but I still unable to receive any DHCP information. When I mirror the port and capture the traffic I only see some dhcp discovers entries from the FEMTO indoor box but no request/offer/ack entries.
A few day ago all the FEMTO indoor boxes were running without any problems, after I configured a new vlan (2002) they did not receive any DHCP informations until now. But why can I receive from any other client an ip address except the FEMTO indoor box and why are there no replies from the DHCP server to the DHCP discovers from the FEMTO indoor box?
Has someone any idea why this happens?
kind regards, Maede