I have created 10 pools for 10 vlans(vlan 2 to vlan 11) in my dhcp server. Till yesterday everything was fine with my LAN but today i found that few systems that are configured for vlan 8 are unable to acquire ip address from that pool. When i tried configuring the systems with another vlans(vlan 2 to vlan11) they are acquiring ip address from particular range and able to communicate in LAN. My question is why those systems are unable to acquire ipaddress from vlan 8 pool? I have checked loggs in the dhcp server, no loggs generated and everything is fine with the server. What could be the reason? How could i solve this problem?