The network element must deny network traffic by default and allow network traffic by exception at all interfaces at the network perimeter.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-27419	SRG-NET-000202	SV-34727r1_rule		Medium

Description
All inbound and outbound traffic must be denied by default. Firewalls and perimeter routers should only allow traffic through that is explicitly permitted. The initial defense for the internal network is to block any traffic at the perimeter that is attempting to make a connection to a host residing on the internal network. In addition, allowing unknown or undesirable outbound traffic by the firewall or router will establish state that will subsequently permit the return of this undesirable traffic inbound.

Description

All inbound and outbound traffic must be denied by default. Firewalls and perimeter routers should only allow traffic through that is explicitly permitted. The initial defense for the internal network is to block any traffic at the perimeter that is attempting to make a connection to a host residing on the internal network. In addition, allowing unknown or undesirable outbound traffic by the firewall or router will establish state that will subsequently permit the return of this undesirable traffic inbound.

STIG	Date
Network Security Requirements Guide	2011-12-28

Details

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