Title

The Juniper perimeter router must be configured to not be a Border Gateway Protocol (BGP) peer to an alternate gateway service provider. (Cat I impact)

Discussion

ISPs use BGP to share route information with other autonomous systems (i.e. other ISPs and corporate networks). If the perimeter router was configured to BGP peer with an ISP, NIPRNet routes could be advertised to the ISP; thereby creating a backdoor connection from the Internet to the NIPRNet.

Check Content

This requirement is not applicable for the DoDIN Backbone. Review the protocols hierarchy in the router configuration (see example below) and verify there are no BGP neighbors configured to a peer AS that belongs to the alternate gateway service provider. protocols { bgp { group AS_2 { type external; peer-as 2; neighbor x.x.x.x { authentication-algorithm hmac-sha-1-96; authentication-key-chain BGP_KEY; } neighbor x.x.x.x { authentication-algorithm hmac-sha-1-96; authentication-key-chain BGP_KEY; } } } If there are BGP neighbors connecting to a peer AS of the alternate gateway service provider, this is a finding.

Fix Text

This requirement is not applicable for the DoDIN Backbone. Configure a static route on the perimeter router to reach the AS of a router connecting to an alternate gateway as shown in the example below. [edit routing-options] set static route 0.0.0.0/0 next-hop x.x.x.x

Additional Identifiers

Rule ID: SV-217034r604135_rule

Vulnerability ID: V-217034

Group Title: SRG-NET-000019-RTR-000009

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.