DHCP issue in our network, could it be hidden 2nd DHCP server?

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http://serverfault.com – Something weird happened today. We have a TP-LINK wifi router in our office distributing a pool of IPs 192.168.80-200. There are some windows and some linux boxes. One of the linux boxes (CentOS) today booted up with IP 192.168.25.X. I tried renewing the lease on my PC (Ubuntu) expecting to get 192.168.1.X, but here is what happened: $ sudo dhclient r $ sudo dhclient eth0 (long wait) $ ifconfig eth0 inet addr: After a few minutes I renewed it again and it came with correct (and from that point for now it is staying correct in every re-newal) Where from that anoth (HowTos)