finding traffic origin in firewaal fortinet 110c

Dear Experts, i've a firewall fortinet 110c. Since a few days i have outbound traffic of about 1mbit on port wan1. I can't find the origin f this traffic. I've verifyed the per-ip bandwith table, the session table and the policy table with the column count active but all is normal.
How can i find from where this traffic is originated ?
Thanks a lot
tachimiriAsked:
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