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  • Author: downeb
  • Date: 19-06-2013, 19:14
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LinuxCBT - Proxy Edition Training

Category: Tutorial

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LinuxCBT - Proxy Edition Training

LinuxCBT - Proxy Edition Training | 972.22 MB





Course Objective

Proxy Security - Module II

Squid Proxy Initialization
Discuss Squid concepts & applications
Discuss DNS application
Configure DNS on primary SuSE Linux server for the Squid Proxy environment
Confirm DNS environment
Start Squid and evaluate default configuration
Install Squid Proxy server

General Proxy Usage
Configure web browser to utilize proxy services
Grant permissions to permit local hosts to utilize proxy services
Discuss ideal file system layout - partitioning
Explore key configuration files
Use client to test the performance of proxy services
Discuss HIT/MISS logic for serving content
Configure proxy support for text-based (lftp/wget/lynx) HTTP clients

Squid Proxy Logs
Discuss Squid Proxy logging mechanism
Identify key log files
Discuss & explore the Access log to identify HITS and/or MISSES
Discuss & explore the Store log to identify cached content
Convert Squid logs to the Common Log Format (CLF) for easy processing
Discuss key CLF fields
Configure Webalizer to process Squid-CLF logs
Revert to Squid Native logs
Discuss key Native log fields
Configure Webalizer to process Squid Native logs

Squid Network Configuration & System Stats
Discuss cachemgr.cgi Common Gateway Interface(CGI) script
Explore the available metrics provided by cachemgr.cgi
Change default Squid Proxy port
Modify text/graphical clients and test communications
Discuss Safe Ports - usage & applications

Squid Access Control Lists (ACLs)
Intro to Access Control Lists (ACLs) - syntax
Define & test multiple HTTP-based ACLs
Define & test ACL lists - to support multiple hosts/subnets
Define & test time-based ACLs
Nest ACLs to tighten security
Implement destination domain based ACLs
Exempt destination domains from being cached to ensure content freshness
Define & test Anded ACLs
Discuss the benefits of Regular Expressions (Regexes)
Implement Regular Expressions ACLs to match URL patterns
Exempt hosts/subnets from being cached or using the Squid cache
Force cache usage
Configure enterprise-class Cisco PIX firewall to deny outbound traffic
Configure DNS round-robin with multiple Squid Proxy caches for load-balancing
Discuss delay pool concepts & applications - bandwidth management
Configure delay pools - to support rate-limiting
Examine results of various delay pool classes
Enforce maximum connections to deter Denial of Service (DoS) attacks
Verify maximum connections comply with security policy

Squid Proxy Hierarchies
Discuss Squid cache hierarchy concepts & applications
Ensure communications through a primary cache server - double-auditing
Discuss and configure parent-child bypass based on ACLs
Configure Intranet ACLs for peer-cache bypass
Discuss & implement Squid cache hierarchy siblings
Configure transparent proxy services

Squid on Windows
Download & Install
Manipulate configuration
Test connectivity from multiple platforms
Evaluate results

Reverse Proxy
Install Squid3
Configure forward proxy access for local subnet
Test connectivity
Discuss reverse proxy features
Configure reverse proxy
Evaluate results

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