I've configured DHCP snooping on the access layer switches as follow:
ip dhcp snooping vlan 1-50,52-59,61-4094 ip dhcp snooping database flash:dhcp\bindings.txt ip dhcp snooping
Switch DHCP snooping is enabled DHCP snooping is configured on following VLANs: 1-50,52-59,61-4094 DHCP snooping is operational on following VLANs: 1,10-15,17-21,23,27,31-35,40-42,52-56,65,80,85,91,110,120,125,300 DHCP snooping is configured on the following L3 Interfaces:
Insertion of option 82 is enabled circuit-id default format: vlan-mod-port remote-id: e840.4097.f880 (MAC) Option 82 on untrusted port is not allowed Verification of hwaddr field is enabled Verification of giaddr field is enabled DHCP snooping trust/rate is configured on the following Interfaces:
DHCP snooping will only prevent the untrusted edge ports from sending DHCP offers. It want stop other devices on the subnet using 10.198.4.36 as a gateway which is what may be happening.
A short term fix would be to configure an outbound ACL on Fa0/25 dropping all IP traffic which is not destined to 10.198.4.0/24 (I am assuming the subnet is a /24). This will prevent it from being used as a gateway.
The long term fix would be to remove the device entirely.
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