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1 SEC450 ACL Tutorial This document highlights the most important concepts on Access Control List (ACL) that you need to learn in order to configure ACL in CLI. This tutorial does not intend by any mean to cover all ACL applications, but only those scenarios used in then SEC450 iLabs. Introduction to Access Control List A host-based firewall essentially works closing and/or opening ports in a computer. The engine behind firewalls is built with Access Control Lists (ACL). Network-based firewalls are implemented in device-specific appliances and routers. Basically, firewalls in routers filter packets through interfaces to permit or deny them. Ports are layer-4 address specified in TCP/IP protocol suit that identify networking processes running in clients and servers. ACLs are configured using shell-specific commands. In Cisco IOS, CLI commands access-list and access-group are used to create and apply ACL on an interface. ACL can be named by number ID or a name. Naming ACL is useful to identify ACL’s purpose. ACL are classified in Standard ACL, and Extended ACL. Standard ACL’s number IDs are assigned from 1 to 99. Extended ACL’s number IDs are from 100 to 199. Standard ACL only uses source IP address in an IP packet to filter through an interface. Hence, standard ACL denies or permits all packets (IP) with the same source IP regardless upper protocols, destination IP address, etc. Example 1: Router(config)#access-list 8 deny host 172.12.3.5 Extended ACL does filtering packets based on protocol, source IP address, source port number, destination IP address and destination port number. Example 2: Router(config)#access-list 102 deny tcp host 10.0.3.2 host 2 172.129.4.1 Deny tcp packets with source IP address 10.0.3.2 and destination IP address 172.129.4.1. Since, Standard ACLs only have source IP address; the rule is to apply them in an interface as closer as possible to the concerning destination network. For the contrary, the rule for Extended ACLs is to apply them in an interface as closer as possible to the source IP address. Use Extended ACL in all iLabs as they are more granular on packets to filter. Create Extended ACL in global configuration You can use access-list command options lt, gt, eq, neq, range (less than, greater than, equal, not equal, range of ports) to do operation with port numbers. Example 3: access-list 102 deny tcp any host 11.23.45.7 gt 20 denies all packets with any source IP address to destination IP address 11.23.45.7 and destination tcp port greater than 20. Example 4: access-list 107 permit udp any any permits all packets with udp protocol with any source IP address to any destination IP address. Extended ACL can do packet filtering based on source port number and destination port number. Extended ACL Syntax can be as follows: access-list <#,name> <protocol> ...
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Student Name _________________________________ Date _____________SEC450 iLab3 Report Initial Configuration ISP Router version 12.3(4)T7 ! hostname ISP_Router ! interface FastEthernet0/0 ip address 200.100.0.1 255.255.255.0 ! interface FastEthernet1/0 ip address 200.100.40.1 255.255.255.0 ! interface Serial0/0 ip address 200.100.10.1 255.255.255.0 ! interface Serial0/1 ip address 200.100.20.1 255.255.255.0 ! router rip network 200.100.0.0 network 200.100.10.0 network 200.100.20.0 network 200.100.40.0 ! line con 0 line aux 0 line vty 0 4 password cisco line vty 5 15 password cisco ! end Note: RED text indicates the required questions to answer Task to Set up Security Policy for Offsite Database Server #1. Explain the meaning of the "three P's" best practice rule to create ACL in routers #2. Explain the difference between the following two access-list commands a) access-list 101 permit tcp any any eq 80 b) access-list 101 permit tcp any eq 80 any #3. What are well-known, registered, and ephemeral UDP/TCP ports? #4. What is wrong with ACL 105? access-list 105 permit tcp any any access-list 105 deny tcp host 201.141.0.3 any #5. What well-known TCP port does Oracle Database (sql net) server use? #6. A company is managing an Oracle Database located in a Public Server to support day-to-day operations in Dallas and Chicago networks. The company has requested its Internet Access Provider (ISP) to create the necessary ACL at the ISP router securing that only responses from Oracle server to certain hosts are allowed to enter Dallas and Chicago LANs. ISP network engineers decided to use extended ACL, and applies it to F0/0 interface in ISP router. Why did they decide to create an extended ACL and apply it in interface F0/0 for inbound traffic? #7. Copy below ISP router’s initial running-config file from page 2, and add the commands needed to create and apply the ACL in the ISP router. Answer all questions in this document and upload it in Week 3 iLab Dropbox. 3 Revision Date: 1103 1 SEC450 ACL Tutorial This document highlights the most important concepts on Access Control List (ACL) that you need to learn in order to configure ACL in CLI. This tutorial does not intend by any mean to cover all ACL applications, but only those scenarios used in then SEC450 iLabs. Introduction to Access Control List A host-based firewall essentially works closing and/or opening ports in a computer. The engine behind firewalls is built with Access Control Lists (ACL). Network-based firewalls are implemented in device-specific appliances and routers. Basically, firewalls in routers filter packets through interfaces to permit or deny them. Ports are layer-4 address specified in TCP/IP protocol suit that identify networking processes running in clients and servers. ACLs are configured using shell-specific commands. In Cisco IOS, CLI commands.
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Chapter10ccna
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