Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 130

Dell#configure terminal Dell(conf)#ip access-list extended abcd Dell(config-ext-nacl)#permit tcp any any Dell(config-ext-nacl)#deny icmp any any Dell(config-ext-nacl)#permit 1.1.1.2 Dell(config-ext-nacl)#end Dell#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 Configure Egress ACLs Egress ACLs are supported on the S4820T platform. 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. To restrict egress traffic, use an egress ACL. For example, when a denial of service (DOS) attack traffic is isolated to a specific interface, you can apply an egress ACL to block the flow from the exiting the box, thus protecting downstream devices. To create an egress ACL, use the ip access-group command in EXEC Privilege mode. The example shows viewing the configuration, applying rules to the newly created access group, and viewing the access list. NOTE: VRF based ACL configurations are not supported on the egress traffic. Example of Applying ACL Rules to Egress Traffic and Viewing ACL Configuration To specify ingress, use the out keyword. Begin applying rules to the ACL with the ip access-list extended abcd command. To view the access-list, use the show command. Dell(conf)#interface gige 0/0 Dell(conf-if-gige0/0)#ip access-group abcd out Dell(conf-if-gige0/0)#show config ! gigethernet 0/0 no ip address ip access-group abcd out no shutdown Dell(conf-if-gige0/0)#end Dell#configure terminal Dell(conf)#ip access-list extended abcd Dell(config-ext-nacl)#permit tcp any any Dell(config-ext-nacl)#deny icmp any any Dell(config-ext-nacl)#permit 1.1.1.2 Dell(config-ext-nacl)#end Dell#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 1.1.1.2 130 Access Control Lists (ACLs)