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PROTECTING EXTRANET COMMUNICATIONS PowerPoint PPT Presentation


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Chapter 11. PROTECTING EXTRANET COMMUNICATIONS. VPN PROTOCOLS. Point-to-Point Tunneling Protocol (PPTP): Not standards-based Linux and Mac software available Layer 2 Transport Protocol over Internet Protocol Security (L2TP/IPSec): Standards-based Linux and Mac software commonly available

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PROTECTING EXTRANET COMMUNICATIONS

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Chapter 11

PROTECTING EXTRANET COMMUNICATIONS


Chapter 11: Protecting Extranet Communications

VPN PROTOCOLS

  • Point-to-Point Tunneling Protocol (PPTP):

    • Not standards-based

    • Linux and Mac software available

  • Layer 2 Transport Protocol over Internet Protocol Security (L2TP/IPSec):

    • Standards-based

    • Linux and Mac software commonly available

  • Early versions of Microsoft Windows require Windows Dial-Up Networking version 1.4 Upgrade


Chapter 11: Protecting Extranet Communications

VPN AUTHENTICATION METHODS

  • EAP

  • MS-CHAP

  • CHAP

  • SPAP

  • PAP

  • Pre-shared keys

  • Unauthenticated access


Chapter 11: Protecting Extranet Communications

CONNECTION MANAGER ADMINISTRATION KIT (CMAK)

  • Simplify deployment of remote access client configurations:

    • Routing table updates

    • Proxy configuration

    • Phone books

    • VPN server

    • Protocols


Chapter 11: Protecting Extranet Communications

REMOTE ACCESS POLICIES (RAPs)

  • Control who connects remotely to your network

  • RAPs consist of:

    • Conditions

    • Permission

    • Profile settings


Chapter 11: Protecting Extranet Communications

REMOTE ACCESS POLICY SCREENSHOT


Chapter 11: Protecting Extranet Communications

QUARANTINE CONTROL

  • Verifies client security before allowing full remote access:

    • Antivirus software is installed

    • Critical updates are installed

    • Known worms and viruses are not present

  • Can grant access to download required software and updates


Chapter 11: Protecting Extranet Communications

QUARANTINE CONTROL COMPONENTS

  • A post-connect network policy requirements script

  • A network policy requirements script

  • A notifier component: Rqc.exe

  • A listener component: Rqs.exe


Chapter 11: Protecting Extranet Communications

QUARANTINE CONTROL NETWORK


Chapter 11: Protecting Extranet Communications

REMOTE ACCESS BEST PRACTICES

  • Require smart cards or client certificates

  • Enforce strong password policies

  • Disable PAP, SPAP, CHAP, LM, and MS-CHAP

  • Upgrade VPN servers to Windows 2000 Server or Windows Server 2003

  • Require L2TP with the strongest encryption


Chapter 11: Protecting Extranet Communications

ROUTING TABLES


Chapter 11: Protecting Extranet Communications

ROUTING PROTOCOL UPDATES


Chapter 11: Protecting Extranet Communications

VPNs SENDING ROUTING UPDATES


Chapter 11: Protecting Extranet Communications

DEMAND-DIAL LINKS

  • Network-to-network links established as needed

  • Can be established one-way or two-way

  • Do not support routing protocols

  • Require statically configured routes


Chapter 11: Protecting Extranet Communications

DEMAND-DIAL STATIC ROUTES


Chapter 11: Protecting Extranet Communications

VPN ARCHITECTURES

  • Behind the firewall

  • In front of the firewall

  • In a screened subnet

  • Hosted at an ISP


Chapter 11: Protecting Extranet Communications

VPN BEHIND THE FIREWALL


Chapter 11: Protecting Extranet Communications

VPN IN FRONT OF THE FIREWALL


Chapter 11: Protecting Extranet Communications

VPN IN A SCREENED SUBNET


Chapter 11: Protecting Extranet Communications

VPN HOSTED AT AN ISP


Chapter 11: Protecting Extranet Communications

GEOGRAPHIC PLACEMENT OF VPN SERVERS

  • VPN servers compound latency

  • Latency leads to poor network performance

  • To improve performance, add VPN servers near users


Chapter 11: Protecting Extranet Communications

HIGH-LATENCY VPN ARCHITECTURE


Chapter 11: Protecting Extranet Communications

LOW-LATENCY VPN ARCHITECTURE


Chapter 11: Protecting Extranet Communications

SPLIT TUNNELING

  • Without split tunneling:

    • Users access internal resources through VPN

    • Users access Internet resources through VPN

  • With split tunneling:

    • Users access internal resources through VPN

    • Users access Internet resources through ISP


Chapter 11: Protecting Extranet Communications

WITHOUT SPLIT TUNNELING


Chapter 11: Protecting Extranet Communications

WITH SPLIT TUNNELING


Chapter 11: Protecting Extranet Communications

ACTIVE DIRECTORY APPLICATION MODE (ADAM)

  • Free download

  • Provides Active Directory Lightweight Directory Access Protocol (LDAP) functionality for applications

  • Does not use security principals

  • Allows multiple instances on a single computer

  • Use Active Directory to ADAM Synchronizer


Chapter 11: Protecting Extranet Communications

SYNCHRONIZING ACTIVE DIRECTORY TO ADAM


Chapter 11: Protecting Extranet Communications

SUMMARY

  • Use L2TP for VPN access whenever possible

  • Use Connection Manager Administration Kit (CMAK) for client VPN and remote access settings

  • RAPs control who can remotely connect

  • Quarantine control checks remote access clients for security requirements

  • Configure static routes for demand-dial links

  • Design VPN architectures to minimize latency

  • Do not create Active Directory accounts for extranet users


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