1
Download Dell Force10 Configuration manual
Transcript
3. View the number of packets matching the ACL. EXEC Privilege mode show ip accounting access-list Configure 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 ACL, use the ip access-group command in EXEC Privilege mode. The example shows applying the ACL, rules to the newly created access group, and viewing the access list. Example of Applying ACL Rules to Ingress Traffic and Viewing ACL Configuration To specify ingress, use the in 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 tengig 0/0 Dell(conf-if-tengig0/0)#ip access-group abcd in Dell(conf-if-tengig0/0)#show config ! tengigethernet 0/0 no ip address ip access-group abcd in no shutdown Dell(conf-if-tengig0/0)#end Dell#configure terminal Dell(conf)#ip access-list extended abcd Dell(conf-ext-nacl)#permit tcp any any Dell(conf-ext-nacl)#deny icmp any any Dell(conf-ext-nacl)#permit 1.1.1.2 Dell(conf-ext-nacl)#end Dell#show ip accounting access-list ! Extended Ingress IP access list abcd on tengigethernet 0/0 seq 5 permit tcp any any seq 10 deny icmp any any seq 15 permit 1.1.1.2 Configure Egress ACLs 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 direct operating system (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. Access Control Lists (ACLs) 113
