The Nokia Border Gateway Protocol (BGP) router must be configured to reject inbound route advertisements for any Bogon prefixes.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-283907NOKI-RT-000960SV-283907r1203970_ruleCCI-001368medium
Description
Accepting route advertisements for Bogon prefixes can result in the local autonomous system (AS) becoming a transit for malicious traffic as it will in turn advertise these prefixes to neighbor autonomous systems.
STIGDate
Nokia Service Router OS 25.x Router Security Technical Implementation Guide2026-06-15

Details

Check Text (C-283907r1203970_chk)

Review the router configuration to verify it will reject routes of any Bogon prefixes. Verify the prefix list using the command below: - show router policy prefix-list "Bogon Prefixes" prefix 0.0.0.0/8 prefix-length-range 8-32 prefix 10.0.0.0/8 prefix-length-range 8-32 prefix 100.64.0.0/10 prefix-length-range 10-32 prefix 127.0.0.0/8 prefix-length-range 8-32 prefix 169.254.0.0/16 prefix-length-range 16-32 prefix 172.16.0.0/12 prefix-length-range 12-32 prefix 192.0.2.0/24 prefix-length-range 24-32 prefix 192.88.99.0/24 prefix-length-range 24-32 prefix 192.168.0.0/16 prefix-length-range 16-32 prefix 198.18.0.0/15 prefix-length-range 15-32 prefix 198.51.100.0/24 prefix-length-range 24-32 prefix 203.0.113.0/24 prefix-length-range 24-32 prefix 224.0.0.0/4 prefix-length-range 4-32 prefix 240.0.0.0/4 prefix-length-range 4-32 - show router policy prefix-list "Permit Prefix" prefix 0.0.0.0/0 prefix-length-range 8-32 Verify the policy statement using the command below: - show router policy "IMPORT-BGP-Prefix" entry 10 from prefix-list "Bogon Prefixes" exit action drop exit exit entry 20 from prefix-list "Permit Prefix" exit action accept exit exit default-action drop exit Verify the policy is applied to the eBGP group using the command below: - show router bgp group "eBGP" detail | match "Import Policy" Import Policy : IMPORT-BGP-Prefix If the router is not configured to reject inbound route advertisements for any Bogon prefixes, this is a finding.

Fix Text (F-88377r1203969_fix)

Ensure all eBGP routers are configured to reject inbound route advertisements for any Bogon prefixes. Create prefix-lists using the configuration below: - configure router policy-options - config>router>policy-options# begin - config>router>policy-options# prefix-list "Bogon Prefixes" - config>router>policy-options>prefix-list$ prefix 0.0.0.0/8 prefix-length-range 8-32 - config>router>policy-options>prefix-list$ prefix 10.0.0.0/8 prefix-length-range 8-32 - config>router>policy-options>prefix-list$ prefix 100.64.0.0/10 prefix-length-range 10-32 - config>router>policy-options>prefix-list$ prefix 127.0.0.0/8 prefix-length-range 8-32 - config>router>policy-options>prefix-list$ prefix 169.254.0.0/16 prefix-length-range 16-32 - config>router>policy-options>prefix-list$ prefix 172.16.0.0/12 prefix-length-range 12-32 - config>router>policy-options>prefix-list$ prefix 192.0.2.0/24 prefix-length-range 24-32 - config>router>policy-options>prefix-list$ prefix 192.88.99.0/24 prefix-length-range 24-32 - config>router>policy-options>prefix-list$ prefix 192.168.0.0/16 prefix-length-range 16-32 - config>router>policy-options>prefix-list$ prefix 198.18.0.0/15 prefix-length-range 15-32 - config>router>policy-options>prefix-list$ prefix 198.51.100.0/24 prefix-length-range 24-32 - config>router>policy-options>prefix-list$ prefix 203.0.113.0/24 prefix-length-range 24-32 - config>router>policy-options>prefix-list$ prefix 224.0.0.0/4 prefix-length-range 4-32 - config>router>policy-options>prefix-list$ prefix 240.0.0.0/4 prefix-length-range 4-32 - config>router>policy-options>prefix-list$ exit - config>router>policy-options# prefix-list "Permit Prefix" - config>router>policy-options>prefix-list$ prefix 0.0.0.0/0 prefix-length-range 8-32 - config>router>policy-options>prefix-list$ exit Create a policy statement using the configuration below: - config>router>policy-options# policy-statement IMPORT-BGP-Prefix - config>router>policy-options>policy-statement$ entry 10 - config>router>policy-options>policy-statement>entry$ from prefix-list "Bogon Prefixes" - config>router>policy-options>policy-statement>entry$ action drop - config>router>policy-options>policy-statement>entry>action$ exit - config>router>policy-options>policy-statement>entry$ exit - config>router>policy-options>policy-statement$ entry 20 - config>router>policy-options>policy-statement>entry$ from prefix-list "Permit Prefix" - config>router>policy-options>policy-statement>entry$ action accept - config>router>policy-options>policy-statement>entry>action$ exit - config>router>policy-options>policy-statement>entry$ exit - config>router>policy-options>policy-statement$ default-action drop - config>router>policy-options>policy-statement>default-action$ exit - config>router>policy-options>policy-statement$ exit - config>router>policy-options# commit Apply the policy to the eBGP group using the configuration below: - configure router bgp group "eBGP" import "IMPORT-BGP-Prefix"