# Service Setting (for Overbilling)

This page lists the physical interfaces on the security device. You can directly enable the Overbilling and Enforce IP-Sec features on this page by selecting the appropriate check box.

### To Enable Overbilling or Enforce IP-Sec

1. Select Overbilling to enable the security device to receive and send Overbilling Attack information through this interface.

2. Select IPSEC to set the interface to only accept incoming connections from an IPSec tunnel.

3. Click Apply to save your settings.