Configuring Reject Actions (C-Web Interface)
You can configure reject actions for Junos OS filter policy rules. The reject action causes the router to discard a packet and send an ICMP destination unreachable message.
To configure a reject action:
In the side pane, select a Junos OS filter policy rule.
From the Create new list, select Reject. Type a name for the action, and click OK.
Enter information as described in the Help text in the main pane, and click Apply.