Force10 Networks PSeries 100-00055-01 - Manual (Page 75)

P-Series Installation and Operation Guide, version 2.3.1.2 75
Deploying the P-Series as a Firewall
By default the P-Series is an IDS/IPS system; the P-Series forwards all traffic by default and blocks
packets only if it matches a rule. You can deploy the P-Series as a limited firewall by enabling Drop mode.
In Drop mode, the P-Series blocks all traffic by default and forwards traffic only if it matches a rule.
Chapter 10 Firewall