Chapter 10
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The document discusses the usage and configuration of access lists on routers to control network traffic and security by filtering packets based on source and destination addresses, protocols, and port numbers. It covers standard and extended IP and IPX access lists, how to establish, apply, and monitor them. Named access lists are also introduced which allow using names instead of numbers to identify lists for improved security and management.
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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> ...
Student Name _________________________________ Date _____________SE.docx
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.
Chapter 08 - Acl
ACLs control and manage network traffic by allowing or denying packet access based on conditions. Standard ACLs are used to filter traffic by source IP address only, while extended ACLs filter by source/destination IP address, protocols, and ports. ACLs are created with permit or deny statements and applied to interfaces using access lists or to virtual terminal lines using access classes to restrict access. Wildcard masks are used to filter groups of IP addresses in an access list.
Configuring extended ACLs
Extended access lists allow for more precise matching of network traffic than standard access lists by allowing specification of source/destination IP addresses, protocol, and port numbers. Two steps are required to configure an extended ACL: 1) use the access list command to define permit/deny rules and 2) apply the ACL to an interface. Extended ACLs can be used to allow certain users to access specific servers by IP and port while denying other traffic.
11 module configuring novell ipx
- The document describes how to configure Novell IPX on Cisco routers, including determining the IPX network number, enabling IPX routing on interfaces, configuring encapsulation types, and verifying IPX operation. It also covers using access lists and SAP filters to control IPX traffic and broadcasts.
Chapter11 -- networking with tcpip and the internet
This chapter discusses TCP/IP network design including subnetting, CIDR, and NAT. It describes protocols for email delivery and access like SMTP, POP, and IMAP. It also explains using TCP/IP networks for voice transmission (VoIP) and provides details on TCP/IP utilities like netstat, nslookup, traceroute, and ifconfig that can be used for network discovery and troubleshooting.
Cisco ACL
The document discusses access control lists (ACLs), including:
1) ACLs are used for packet filtering and can allow or deny traffic based on source/destination IP addresses and TCP/UDP ports.
2) Standard ACLs filter based on source IP address, extended ACLs add destination IP address and ports.
3) ACLs are configured with numbers or names and applied to interfaces to filter incoming or outgoing traffic.
Acl
ACLs are lists applied to routers to control network access by filtering packets based on conditions like source/destination addresses, protocols, and port numbers. They can limit traffic to increase performance, provide traffic flow control, and provide basic network security. There are standard and extended ACLs, with extended ACLs providing more granular control by checking source/destination addresses and specific protocols and ports. Basic rules for ACLs include applying standard ACLs near the destination and extended ACLs near the source, processing entries sequentially from top to bottom, and filtering from specific to general.
10 module
The document discusses using access lists to filter IP traffic passing through a router. It describes the different types of access lists (standard and extended), how to configure them to allow or deny traffic based on source/destination addresses and protocols, and how to apply them to interfaces to filter incoming or outgoing traffic.
20 access lists[1]
The document discusses using access lists to manage IP traffic through a router. It describes how access lists can be used to permit or deny packets moving through the router based on source addresses, destinations, protocols, and ports. It provides examples of standard IP access list configurations to deny specific hosts, subnets, and permit or deny traffic to interfaces.
CS6551 COMPUTER NETWORKS
This document discusses fundamentals and link layer concepts in computer networks including:
- Network requirements, layering, protocols, and Internet architecture
- Link layer services such as framing, error detection, and flow control
- Performance metrics including bandwidth, latency, and the relationship between delay and bandwidth
- Common communication patterns like client-server and examples of TCP and UDP socket programming in C
Basic ip traffic management with access control lists
The document discusses basic concepts of access control lists (ACLs) including the types of ACLs, how they are configured and used, and how traffic is processed when ACLs are applied. It provides details on standard and extended ACLs, how they can be used to filter traffic by source/destination IP addresses, protocols, ports and ICMP message types. The document also covers best practices for verifying, monitoring and placing ACLs on network interfaces.
Similar to Chapter 10 (20)
1 SEC450 ACL Tutorial This document highlights.docx
1 SEC450 ACL Tutorial This document highlights.docx
Student Name _________________________________ Date _____________SE.docx
Student Name _________________________________ Date _____________SE.docx
Chapter11 -- networking with tcpip and the internet
Chapter11 -- networking with tcpip and the internet
Basic ip traffic management with access control lists
Basic ip traffic management with access control lists
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Chapter 10
- 1. CHAPTER ONE Access Lists
- 6. Access List Rules Figure 10-2: No access-list command
- 8. Access List Rules Figure 10-3: The man in the router
- 12. Standard IP Access Lists Table 10-1: Wildcard mask examples
- 13. Standard IP Access Lists Figure 10-4: Wildcard masking example matching a single host
- 14. Standard IP Access Lists Figure 10-5: Wildcard masking example matching a complete subnet
- 16. Standard IP Access Lists Figure 10-7: Wildcard masking example without match
- 17. Standard IP Access List Examples Figure 10-8: Sample IP network
- 18. Standard IP Access List Examples Figure 10-9: Creating a standard IP access list
- 19. Standard IP Access List Examples Figure 10-10: Sample IP network with two Ethernet interfaces on RouterB
- 20. Standard IP Access List Examples Figure 10-11: Show access-lists and show ip access-lists commands
- 21. Standard IP Access List Examples Figure 10-12: Show ip interface command
- 22. Standard IP Access List Examples Figure 10-13: Removing an ip access list from an interface
- 23. Standard IP Access List Examples Figure 10-14: Show ip interface after removal of access list 1 from e0
- 24. Standard IP Access List Examples Figure 10-15: Creation and application of standard IP access list
- 25. Standard IP Access List Examples Figure 10-16: Show access-list and show ip interface commands
- 26. Standard IP Access List Examples Figure 10-17: Access list that blocks multiple subnets
- 29. Extended IP Access List Examples Figure 10-18: Sample IP network with a Web server
- 31. Extended IP Access List Examples Figure 10-19: Extended IP access list example
- 32. Extended IP Access List Examples Figure 10-19 (cont.): Extended IP access list example
- 33. Extended IP Access List Examples Figure 10-20: Extended IP access list example continued
- 34. Extended IP Access List Examples Figure 10-20 (cont.): Extended IP access list example continued
- 35. Extended IP Access List Examples Figure 10-21: Applying an extended ip access list to an interface
- 36. Extended IP Access List Examples Figure 10-22: Removing an extended ip access list from an interface
- 38. Monitoring Extended IP Access Lists Figure 10-23: Show ip access-lists command
- 39. Monitoring Extended IP Access Lists Figure 10-24: Clear access-list counters command
- 41. Standard IPX Access List Examples Figure 10-25: Sample IPX network
- 42. Standard IPX Access List Examples Figure 10-26: Standard IPX access-list configuration
- 43. Monitoring Standard IPX Lists Figure 10-27: Show access-list command
- 45. Extended IPX Access Lists Figure 10-28 (cont.): Configuring extended IPX access-lists
- 46. Monitoring Extended IPX Access Lists Figure 10-29: show access-lists command
- 48. IXP SAP Filter Example Figure 10-30: IPX SAP filter example
- 49. IXP SAP Filter Example Figure 10-31: Applying an IPX SAP filter to an interface