ACL Overview | Cisco Systems OL-5650-02 specification

Chapter 1 Controlling CSS Access

Controlling CSS Network Traffic Through Access Control Lists

•Logging ACL Activity

•ACL Example

ACL Overview

ACLs configured on the CSS provide a basic level of security for accessing your network. Without ACLs on the CSS, all packets passing through VLAN circuits on the CSS could be allowed onto the entire network. With ACLs, you may want to permit all e-mail traffic on the CSS circuit, but block Telnet traffic. You can also use ACLs to allow one client to access a part of the network and prevent another client from accessing the same area.

An ACL consists of clauses that you define. The CSS uses these clauses to determine how to handle each packet it processes on a VLAN circuit. When the CSS examines each packet, it either forwards or blocks the packet based on whether or not the packet matches a clause in the ACL. You must configure a permit clause in an ACL to allow traffic through the circuit. An implicit “deny all” clause exists at the end of every ACL.

When configuring ACLs on a CSS, you must apply an ACL to each VLAN circuit on the CSS to control traffic on the VLAN. An applied ACL on a circuit assigns the ACL and its clauses to the circuit.

After you apply an ACL to each CSS circuit, you must enable the ACLs on the CSS. Globally enabling ACLs affect all circuits in the CSS. When you enable ACLs, the CSS uses the clauses in all ACLs to permit or deny traffic on all circuits. If a circuit does not have an ACL, the CSS applies an implicit “deny all” clause to this circuit causing the CSS to deny all traffic on it.

		Cisco Content Services Switch Security Configuration Guide
		Cisco Content Services Switch Security Configuration Guide
	OL-5650-02			1-13
	OL-5650-02			1-13

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Cisco Systems OL-5650-02 manual ACL Overview

Contents

Cisco Content Services Switch Security Configuration Guide Cisco Content Services Switch Security Configuration Guide Iii N T E N T S ACL Overview Configuring the CSS as a Client of a Radius Server Configuring Firewall Load Balancing Vii Example of Fwlb Viii B L E S OL-5650-02 Preface Audience How to Use This GuideXii Xiii Related Documentation Xiv Rmon Document Title Description Xvi Symbols and Conventions Cisco.com Obtaining DocumentationXvii Documentation DVD Documentation FeedbackOrdering Documentation Xviii Cisco Product Security Overview Reporting Security Problems in Cisco ProductsXix Cisco Technical Support Website Obtaining Technical Assistance Xxi Submitting a Service Request Xxii Definitions of Service Request Severity Xxiii Xxiv Controlling CSS Access Config# username-offdm bobo password secret Changing the Administrative Username and Password Config# username picard password captain superuser Creating Usernames and Passwords Controlling CSS Access Creating Usernames and Passwords Config# no username picard Config# username picard password captain superuser NwbnnnrConfig# username picard password flute superuser Controlling Remote User Access to the CSS Configuring Virtual Authentication #config virtual authentication primary tacacs Configuring Console Authentication#config virtual authentication secondary local #config console authentication secondary local #config console authentication primary tacacs#config no console authentication Enabling Administrative Access to the CSS Controlling Administrative Access to the CSS Config# no restrict web-mgmt Disabling Administrative Access to the CSS Config# restrict telnet Controlling CSS Network Traffic Through Access Control Lists ACL Overview ACL ACL Configuration Quick Start Config-acl7#clause 15 permit any any destination any Config-acl7#clause 10 deny any any destination range 20Config-acl7#apply circuit-VLAN1 Creating an ACL Config-acl7#remove circuit-VLAN1 Config# acl disableDeleting an ACL Configuring Clauses Cisco Content Services Switch Security Configuration Guide Variables Options Parameters Destination content ownername/ rulename for an Variables OptionsParameters Show group ? Variables Options Parameters Prefer Adding a Clause When ACLs are Globally Enabled Config-acl7apply circuit-VLAN1 Config-acl7remove circuit-VLAN1Deleting a Clause Applying an ACL to a Circuit or DNS Queries Removing an ACL from Circuits or DNS Queries Enabling ACLs on the CSS Showing ACLs Disabling ACLs on the CSS Field Description Logging ACL Activity Setting the Show ACL Counters to Zero Config-acl7#clause 1 log disable Config-acl7#clause 1 log enable ACL Example Config# no logging subsystem acl Configuring Network Qualifier Lists for ACLs Describing an NQL Creating an NQLAdding Networks to an NQL Config-nqlbypassnql#no ip address 192.168.0.0/16 Config# logging subsystem nql level debug-7 Adding an NQL to an ACL Clause Showing NQL Configurations Configuring the Secure Shell Daemon Protocol # license Enabling SSH Configuring Sshd in the CSS Configuring SSH AccessConfiguring Sshd Keepalive Config# no restrict ssh Configuring Sshd Server-Keybits Configuring Sshd Port Config# sshd server-keybits Configuring Sshd VersionConfig# no sshd server-keybits Config# sshd version Showing Sshd Configurations Configuring Telnet Access When Using SshdConfig# no restrict telnet # show sshd config # show sshd sessions # show sshd version Ptyfd Radius Server Configuring the CSS as a Client of a Radius Server Config# radius-server primary 172.27.56.76 secret Hello Radius Configuration Quick StartConfig# radius-server secondary 172.27.56.79 secret Hello #config virtual authentication primary radius Configuring a Radius Server for Use with the CSS Configuring Authorization Settings Configuring Authentication Settings Specifying a Primary Radius Server Config# no radius-server secondary Config# no radius-server primarySpecifying a Secondary Radius Server Configuring the Radius Server Retransmits Configuring the Radius Server TimeoutsConfig# radius-server timeout Config# no radius-server timeout Config# no radius-server retransmit Configuring the Radius Server Dead-TimeConfig# radius-server dead-time Config# no radius-server dead-time DOWN, Unknown Config# show radius statistics secondary 3describes the fields in the show radius statistics output OL-5650-02 TACACS+ Server TACACS+ Configuration Quick Start Config# show tacacs-server Configuring Authorization Settings Configuring Global TACACS+ Attributes #config tacacs-server timeout Setting the Global CSS TACACS+ Timeout Period#config no tacacs-server timeout #config tacacs-server key market Setting the Global TACACS+ Keepalive Frequency#config tacacs-server key acskefterefesdtx #config no tacacs-server key Defining a TACACS+ Server Config# no tacacs-server frequency OL-5650-02 #config no tacacs-server 192.168.11.1 Setting TACACS+ Authorization #config tacacs-server authorize non-config #config tacacs-server authorize config#config no tacacs-server authorize config #config no tacacs-server authorize non-config Setting TACACS+ Accounting Showing TACACS+ Server Configuration Information Field Description OL-5650-02 Configuring Firewall Load Balancing Overview of Fwlb Firewall Synchronization Configuring Fwlb Config# ip firewall 1 192.168.27.1 192.168.28.1 Configuring a Keepalive Timeout for a FirewallConfig# no ip firewall Config# ip firewall timeout Configuring an IP Static Route for a FirewallConfig# no ip firewall timeout Config# ip route 192.168.2.0/24 firewall 1 Configuring Ospf to Advertise Firewall RoutesConfig# no ip route 192.168.2.0/24 firewall Config# ospf redistribute firewall metric 3 type1 Example of Fwlb Static Route Configuration Configuring RIP to Advertise Firewall RoutesConfig# no ospf redistribute firewall Config# rip redistribute firewall Config# ip route 192.168.2.0/24 firewall Config# ip firewall 1 192.168.28.1 192.168.27.1Config# ip firewall 2 192.168.28.2 192.168.27.2 Config# ip route 0.0.0.0/0 firewall Example of Fwlb Configuring Fwlb with VIP and Virtual Interface Redundancy Fwlb with VIP/Interface Redundancy Configuration Cisco Content Services Switch Security Configuration Guide CSS-OUT-L Configuration Example of Firewall and Route Configurations CSS-IN-L Configuration Config# show flows Config# show flows 192.165.22.1Displaying Firewall Flow Summaries Displaying Firewall IP Routes Config# show ip routes firewall Displaying Firewall IP Information Config# show ip firewall OL-5650-02 IN-1 D E IN-2 IN-3 FTP IN-4 Radius IN-5 XML IN-6