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Router Security Requirements Guide

Version

V5R2

Release Date

Sep 10, 2025

SCAP Benchmark ID

Router_SRG

Total Checks

123

Tags

network
CAT I: 10CAT II: 84CAT III: 29

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DOD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil.

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Checks (123)

V-207097MEDIUMThe router must be configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies.V-207098MEDIUMThe BGP router must be configured to reject inbound route advertisements for any Bogon prefixes.V-207099MEDIUMThe BGP router must be configured to reject inbound route advertisements for any prefixes belonging to the local autonomous system (AS).V-207100MEDIUMThe BGP router must be configured to reject inbound route advertisements from a customer edge (CE) router for prefixes that are not allocated to that customer.V-207101MEDIUMThe BGP router must be configured to reject outbound route advertisements for any prefixes that do not belong to any customers or the local autonomous system (AS).V-207102LOWThe BGP router must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.V-207103LOWThe Multicast Source Discovery Protocol (MSDP) router must be configured to filter received source-active multicast advertisements for any undesirable multicast groups and sources.V-207104LOWThe Multicast Source Discovery Protocol (MSDP) router must be configured to filter source-active multicast advertisements to external MSDP peers to avoid global visibility of local-only multicast sources and groups.V-207105LOWThe MSDP router must be configured to limit the amount of source-active messages it accepts on per-peer basis.V-207106LOWThe BGP router must be configured to reject route advertisements from CE routers with an originating AS in the AS_PATH attribute that does not belong to that customer.V-207107LOWThe router must be configured to disable the auxiliary port unless it is connected to a secured modem providing encryption and authentication.V-207108MEDIUMThe perimeter router must be configured to enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.V-207109MEDIUMThe multicast router must be configured to disable Protocol Independent Multicast (PIM) on all interfaces that are not required to support multicast routing.V-207110MEDIUMThe multicast router must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.V-207111LOWThe multicast edge router must be configured to establish boundaries for administratively scoped multicast traffic.V-207112LOWThe router must be configured to have all inactive interfaces disabled.V-207113HIGHThe perimeter router must be configured to protect an enclave connected to an alternate gateway by using an inbound filter that only permits packets with destination addresses within the site's address space.V-207114HIGHThe perimeter router must be configured to not be a Border Gateway Protocol (BGP) peer to an alternate gateway service provider.V-207115LOWThe perimeter router must be configured to not redistribute static routes to an alternate gateway service provider into Border Gateway Protocol (BGP) or an Interior Gateway Protocol (IGP) peering with the NIPRNet or to other autonomous systems.V-207116MEDIUMThe out-of-band management (OOBM) gateway router must be configured to have separate Interior Gateway Protocol (IGP) instances for the managed network and management network.V-207117MEDIUMThe out-of-band management (OOBM) gateway router must be configured to not redistribute routes between the management network routing domain and the managed network routing domain.V-207118LOWThe multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated Router (DR) for any undesirable multicast groups and sources.V-207119LOWThe multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Router (DR) for any undesirable multicast groups.V-207120MEDIUMThe router must be configured to produce audit records containing information to establish where the events occurred.V-207121MEDIUMThe router must be configured to produce audit records containing information to establish the source of the events.V-207122LOWThe router must be configured to log all packets that have been dropped.V-207123LOWThe router must be configured to have all non-essential capabilities disabled.V-207124MEDIUMThe router must be configured to use encryption for routing protocol authentication.V-207125MEDIUMThe router must be configured to authenticate all routing protocol messages using NIST-validated FIPS 198-1 message authentication code algorithm.V-207126MEDIUMThe PE router must be configured to limit the number of MAC addresses it can learn for each Virtual Private LAN Services (VPLS) bridge domain.V-207127LOWThe MPLS router with RSVP-TE enabled must be configured with message pacing or refresh reduction to adjust maximum number of RSVP messages to an output queue based on the link speed and input queue size of adjacent core routers.V-207128MEDIUMThe PE router providing Virtual Private LAN Services (VPLS) must be configured to have traffic storm control thresholds on CE-facing interfaces.V-207129MEDIUMThe PE router must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.V-207130LOWThe PE router must be configured to enforce a Quality-of-Service (QoS) policy in accordance with the QoS DoDIN Technical Profile.V-207131LOWThe P router must be configured to enforce a Quality-of-Service (QoS) policy in accordance with the QoS GIG Technical Profile.V-207132HIGHThe perimeter router must be configured to deny network traffic by default and allow network traffic by exception.V-207133HIGHThe router must be configured to restrict traffic destined to itself.V-207134MEDIUMThe router must be configured to drop all fragmented Internet Control Message Protocol (ICMP) packets destined to itself.V-207135MEDIUMThe perimeter router must be configured to filter traffic destined to the enclave in accordance with the guidelines contained in DoD Instruction 8551.1.V-207136MEDIUMThe perimeter router must be configured to filter ingress traffic at the external interface on an inbound direction.V-207137MEDIUMThe perimeter router must be configured to filter egress traffic at the internal interface on an inbound direction.V-207138MEDIUMThe BGP router must be configured to reject outbound route advertisements for any prefixes belonging to the IP core.V-207139HIGHThe PE router must be configured to block any traffic that is destined to IP core infrastructure.V-207140MEDIUMThe PE router must be configured with Unicast Reverse Path Forwarding (uRPF) loose mode enabled on all CE-facing interfaces..V-207141MEDIUMThe out-of-band management (OOBM) gateway must be configured to transport management traffic to the Network Operations Center (NOC) via dedicated circuit, MPLS/VPN service, or IPsec tunnel.V-207142MEDIUMThe out-of-band management (OOBM) gateway router must be configured to forward only authorized management traffic to the Network Operations Center (NOC).V-207143MEDIUMThe out-of-band management (OOBM) gateway router must be configured to block any traffic destined to itself that is not sourced from the OOBM network or the NOC.V-207144MEDIUMThe router must be configured to only permit management traffic that ingresses and egresses the OOBM interface.V-207145MEDIUMThe router providing connectivity to the NOC must be configured to forward all in-band management traffic via an IPsec tunnel.V-207146MEDIUMThe router must be configured to stop forwarding traffic upon the failure of the following actions: system initialization, shutdown, or system abort.V-207147MEDIUMThe PE router providing MPLS Layer 2 Virtual Private Network (L2VPN) services must be configured to authenticate targeted Label Distribution Protocol (LDP) sessions used to exchange virtual circuit (VC) information using a FIPS-approved message authentication code algorithm.V-207148MEDIUMThe Multicast Source Discovery Protocol (MSDP) router must be configured to authenticate all received MSDP packets.V-207149MEDIUMThe router must not be configured to have any zero-touch deployment feature enabled when connected to an operational network.V-207150MEDIUMThe router must be configured to protect against or limit the effects of denial-of-service (DoS) attacks by employing control plane protection.V-207151MEDIUMThe router must be configured to have Gratuitous ARP disabled on all external interfaces.V-207152LOWThe router must be configured to have IP directed broadcast disabled on all interfaces.V-207153MEDIUMThe router must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.V-207154MEDIUMThe router must be configured to have Internet Control Message Protocol (ICMP) mask replies disabled on all external interfaces.V-207155MEDIUMThe router must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.V-207156MEDIUMThe BGP router must be configured to use the maximum prefixes feature to protect against route table flooding and prefix de-aggregation attacks.V-207157LOWThe BGP router must be configured to limit the prefix size on any inbound route advertisement to /24 or the least significant prefixes issued to the customer.V-207158LOWThe PE router must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.V-207159LOWThe multicast Rendezvous Point (RP) router must be configured to limit the multicast forwarding cache so that its resources are not saturated by managing an overwhelming number of Protocol Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP) source-active entries.V-207160MEDIUMThe multicast Rendezvous Point (RP) must be configured to rate limit the number of Protocol Independent Multicast (PIM) Register messages.V-207161MEDIUMThe multicast Designated Router (DR) must be configured to limit the number of mroute states resulting from Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Host Membership Reports.V-207162MEDIUMThe multicast Designated Router (DR) must be configured to increase the shortest-path tree (SPT) threshold or set it to infinity to minimalize source-group (S, G) state within the multicast topology where Any Source Multicast (ASM) is deployed.V-207163MEDIUMThe perimeter router must be configured to only allow incoming communications from authorized sources to be routed to authorized destinations.V-207164MEDIUMThe perimeter router must be configured to block inbound packets with source Bogon IP address prefixes.V-207165LOWThe perimeter router must be configured to have Link Layer Discovery Protocols (LLDPs) disabled on all external interfaces.V-207166MEDIUMThe perimeter router must be configured to have Proxy ARP disabled on all external interfaces.V-207167MEDIUMThe perimeter router must be configured to block all outbound management traffic.V-207168LOWThe multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join only multicast groups that have been approved by the organization.V-207169MEDIUMThe multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join a multicast group only from sources that have been approved by the organization.V-207170MEDIUMThe Multicast Source Discovery Protocol (MSDP) router must be configured to only accept MSDP packets from known MSDP peers.V-207171MEDIUMThe router must be configured to fail securely in the event of an operational failure.V-207172LOWThe BGP router must be configured to use its loopback address as the source address for iBGP peering sessions.V-207173LOWThe MPLS router must be configured to use its loopback address as the source address for LDP peering sessions.V-207174LOWThe MPLS router must be configured to synchronize IGP and LDP to minimize packet loss when an IGP adjacency is established prior to LDP peers completing label exchange.V-207175MEDIUMThe MPLS router must be configured to have TTL Propagation disabled.V-207176HIGHThe PE router must be configured to have each Virtual Routing and Forwarding (VRF) instance bound to the appropriate physical or logical interfaces to maintain traffic separation between all MPLS L3VPNs.V-207177HIGHThe PE router must be configured to have each Virtual Routing and Forwarding (VRF) instance with the appropriate Route Target (RT).V-207178MEDIUMThe PE router must be configured to have each VRF with the appropriate Route Distinguisher (RD).V-207179HIGHThe PE router providing MPLS Virtual Private Wire Service (VPWS) must be configured to have the appropriate virtual circuit identification (VC ID) for each attachment circuit.V-207180HIGHThe PE router providing Virtual Private LAN Services (VPLS) must be configured to have all attachment circuits defined to the virtual forwarding instance (VFI) with the globally unique VPN ID assigned for each customer VLAN.V-207181LOWThe PE router must be configured to enforce the split-horizon rule for all pseudowires within a Virtual Private LAN Services (VPLS) bridge domain.V-207182LOWThe Multicast Source Discovery Protocol (MSDP) router must be configured to use its loopback address as the source address when originating MSDP traffic.V-216506MEDIUMThe router must be configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs.V-216978MEDIUMThe router must not be configured to have any feature enabled that calls home to the vendor.V-216979HIGHThe perimeter router must be configured to restrict it from accepting outbound IP packets that contain an illegitimate address in the source address field via egress filter or by enabling Unicast Reverse Path Forwarding (uRPF).V-216980MEDIUMThe perimeter router must be configured to block all packets with any IP options.V-216981MEDIUMThe PE router must be configured to ignore or block all packets with any IP options.V-216982MEDIUMThe router must be configured to implement message authentication for all control plane protocols.V-216983MEDIUMThe BGP router must be configured to use a unique key for each autonomous system (AS) that it peers with.V-216984MEDIUMThe router must be configured to use keys with a duration not exceeding 180 days for authenticating routing protocol messages.V-216985LOWThe BGP router must be configured to enable the Generalized TTL Security Mechanism (GTSM).V-220144LOWThe router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless auto-configuration deployments.V-220145MEDIUMThe router must not be configured to use IPv6 Site Local Unicast addresses.V-220146MEDIUMThe perimeter router must be configured to suppress Router Advertisements on all external IPv6-enabled interfaces.V-220147MEDIUMThe perimeter router must be configured to drop IPv6 undetermined transport packets.V-220148MEDIUMThe perimeter router must be configured drop IPv6 packets with a Routing Header type 0, 1, or 3255.V-220149MEDIUMThe perimeter router must be configured to drop IPv6 packets containing a Hop-by-Hop header with invalid option type values.V-220150MEDIUMThe perimeter router must be configured to drop IPv6 packets containing a Destination Option header with invalid option type values.V-220151MEDIUMThe perimeter router must be configured to drop IPv6 packets containing an extension header with the Endpoint Identification option.V-220152MEDIUMThe perimeter router must be configured to drop IPv6 packets containing the NSAP address option within Destination Option header.V-220153MEDIUMThe perimeter router must be configured to drop IPv6 packets containing a Hop-by-Hop or Destination Option extension header with an undefined option type.V-264309MEDIUMThe router must employ organization-defined controls by type of denial of service (DoS) to achieve the DoS objective.V-264310MEDIUMThe router must implement physically or logically separate subnetworks to isolate organization-defined critical system components and functions.V-264311MEDIUMThe router must establish organization-defined alternate communications paths for system operations organizational command and control.V-278997MEDIUMThe router must dynamically associate security attributes with organization-defined subjects in accordance with organization-defined security policies as information is created and combined.V-278998MEDIUMThe router must validate the integrity of transmitted security attributes.V-278999MEDIUMThe router must enforce information flow control based on organization-defined metadata.V-279000MEDIUMThe router must use organization-defined security attributes associated with organization-defined information, source, and destination objects to enforce organization-defined information flow control policies as a basis for flow control decisions.V-279001MEDIUMWhen transferring information between different security domains, the router must use organization-defined data type identifiers to validate data essential for information flow decisions.V-279002MEDIUMThe router must uniquely identify and authenticate source by organization, system, application, and/or individual for information transfer.V-279003MEDIUMThe router must uniquely identify and authenticate destination by organization, system, application, and/or individual for information transfer.V-279004MEDIUMWhen transferring information between different security domains, the router must apply the same security policy filtering to metadata as it applies to data payloads.V-279005MEDIUMThe router must use cryptographic algorithms approved by NSA to protect NSS when transporting classified traffic across an unclassified network.V-279006MEDIUMThe router must implement cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission.V-279007MEDIUMThe router must use a FIPS-validated cryptographic module to generate cryptographic hashes.V-279008MEDIUMThe router must dynamically associate security attributes with organization-defined objects in accordance with organization-defined security policies as information is created and combined.V-279009MEDIUMThe router must be configured to use cryptographic algorithms approved by NSA to protect NSS for remote access to a classified network.V-279010MEDIUMThe router must use a FIPS-validated cryptographic module to provision digital signatures.V-279011MEDIUMThe router must use a FIPS-validated cryptographic module to implement encryption services for unclassified information requiring confidentiality.