Is there a way to setup differents rules for different environnement for the same laptop ?
Example, If I want SEP to setup a set of rules while in the corporate network and another set of rules if on an external network ?
You just need to configure location awareness
Setting up Scenario Two location awareness conditions
You can assign different policies for each location
As Brian said location awareness the way forward here are some further links.
Best Practices for Symantec Endpoint Protection Location Awareness
http://www.symantec.com/docs/TECH98211
Location Awareness Logic
http://www.symantec.com/docs/TECH97097
How to configure mobile computers to automatically download virus definitions when disconnected from the Symantec Endpoint Protection Management console
http://www.symantec.com/docs/TECH104571
How to Use Location Awareness as Fault Tolerance for Content Updates
http://www.symantec.com/docs/TECH94265
Check this fourms.
https://www-secure.symantec.com/connect/forums/location-awarness