Dell Force10 S4820T S4820T Configuration Guide - Page 125

Configuring Ingress ACLs Ingress ACLs are applied to interfaces and to traffic entering the system.These system-wide ACLs eliminate the need to apply ACLs onto each interface and achieves the same results. By localizing target traffic, it is a simpler implementation. To create an ingress ACLs, use the ip access-group command in the EXEC Privilege mode as shown below. This example also shows applying the ACL, applying rules to the newly created access group, and viewing the access list: FTOS(conf)#interface gige 0/0 FTOS(conf-if-gige0/0)#ip access-group abcd in FTOS(conf-if-gige0/0)#show config ! gigethernet 0/0 no ip address ip access-group abcd in no shutdown FTOS(conf-if-gige0/0)#end FTOS#configure terminal FTOS(conf)#ip access-list extended abcd FTOS(config-ext-nacl)#permit tcp any any FTOS(config-ext-nacl)#deny icmp any any FTOS(config-ext-nacl)#permit 1.1.1.2 FTOS(config-ext-nacl)#end FTOS#show ip accounting access-list ! Extended Ingress IP access list abcd on gigethernet 0/0 seq 5 permit tcp any any seq 10 deny icmp any any seq 15 permit 1.1.1.2 Configuring Egress ACLs e Egress ACLs are supported on platforms and S4820T Egress ACLs are applied to line cards and affect the traffic leaving the system. Configuring egress ACLs onto physical interfaces protects the system infrastructure from attack-malicious and incidental-by explicitly allowing only authorized traffic.These system-wide ACLs eliminate the need to apply ACLs onto each interface and achieves the same results. By localizing target traffic, it is a simpler implementation. An egress ACL is used when users would like to restrict egress traffic. For example, when a DOS attack traffic is isolated to one particular interface, you can apply an egress ACL to block that particular flow from exiting the box, thereby protecting downstream devices. Access Control Lists (ACLs) | 125