Rule ID
SV-283868r1203853_rule
Version
V1R1
CCIs
Packets with IP options are not fast switched and therefore must be punted to the router processor. Hackers who initiate denial-of-service (DoS) attacks on routers commonly send large streams of packets with IP options. Dropping the packets with IP options reduces the load of IP options packets on the router. The end result is a reduction in the effects of the DoS attack on the router and downstream routers.
This requirement is not applicable for the DODIN Backbone. Review the router configuration to determine if it will block all packets with IP options. Verify the IPv4 filter is applied on the interface using the command below: - show router interface "TO-PE3" detail | match "Ingress Filter" Egress Filter : none Ingress Filter : 10 If the router is not configured to drop all packets with IP options, this is a finding.
This requirement is not applicable for the DODIN Backbone. Configure the router to drop all packets with IP options, as shown in the example below: Create an IPv4 filter: - configure filter ip-filter 10 create - config>filter>ip-filter# entry 10 create - config>filter>ip-filter>entry# match option-present true - config>filter>ip-filter>entry# action drop - config>filter>ip-filter>entry# exit all Apply an IP-filter on the interface: - configure router interface "TO-PE3" ingress filter ip 10