The Cisco router must be configured to restrict traffic destined to itself.
An XCCDF Rule
Description
The route processor handles traffic destined to the router—the key component used to build forwarding paths and is instrumental with all network management functions. Hence, any disruption or DoS attack to the route processor can result in mission critical network outages.
- ID
- SV-216743r531087_rule
- Version
- CISC-RT-000130
- Severity
- High
- References
- Updated
Remediation Templates
A Manual Procedure
Configure the ACL for any external interfaces as shown in the example.
RP/0/0/CPU0:R3(config)#ipv4 access-list EXTERNAL_ACL_INBOUND
RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp host x.11.1.1 eq bgp host x.11.1.2
RP/0/0/CPU0:R3(config-ipv4-acl)#permit tcp host x.11.1.1 host x.11.1.2 eq bgp
RP/0/0/CPU0:R3(config-ipv4-acl)#permit icmp host x.11.1.1 host x.11.1.2 echo