Pfsense generating a lot of lan traffic

[veljom]

Hello everyone,

We made a Pfsense Internal firewall based on this doc

http://doc.pfsense.org/index.php/Configuring_pfSense_Hardware_Redundancy_(CARP)

However, as soon as we plugged pfsense on our corporate network, network performance was heavily degradeted (ping requests time out etc).  Two pfsense PC's were just connected to LAN, they are not even funcioning as gateways to other LANs yet.  DHCP server is disabled in pfsense setup, as is logging for all firewall rules, but something still seems to generate a lot of LAN traffic.

Any ideas what needs to be double checked?