Virtual Private Network (VPN) Technologies in Software

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A virtual private network (VPN) is a private tunnel between two devices, typically across an unprotected network Although encryption is most often used to create this private tunnel, certain Internet service providers (ISPs) sell VPN solutions where the traffic is statically routed Even though no encryption takes place, these ISPs consider this arrangement to be their own virtual private network VPN solutions can exist between several types of devices, including VPN routers VPN firewalls VPN servers VPN clients Note that VPNs fill various roles One VPN may be a single-user, remote access solution Another may be a multiuser LAN-to-LAN connection across the Internet These two interpretations of VPN have their own specific technical issues and may use different technologies Figure 14-2 illustrates a VPN across an unprotected network such as the Internet
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Figure 14-2: A virtual private network, without security protection VPN solutions are sold by many vendors As for any other technology, standardization among versions is needed to support interoperability Internet Protocol Security (IPSec) is a collection of standards used to support an IP-layer VPN By using encryption, security, and authentication protocols, IPSec ensures confidentiality, integrity, and authenticity Cisco offers IPSec across a wide range of platforms, including Cisco IOS software and Cisco PIX Firewall IPSec is available in Cisco IOS software version 113(3)T IPSec-supported platforms include
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Cisco 1600 Series Cisco 1720 Series Cisco 2500 Series Cisco 2600 Series Cisco 3600 Series Cisco 4000 Series Cisco 4500 Series Cisco 5300 Series Cisco 7100 Series Cisco 7200 Series Cisco 7500 Series If you don't currently have Cisco hardware in your network infrastructure (or you don't have the IPSec-supported platforms), enabling the Cisco VPN solution will require the purchase of extensive hardware and software You'll need to obtain the components on each end to create the VPN tunnel whether these components are IPSec-supported routers, firewalls, servers, or client software Microsoft offers a PPTP VPN client solution, included in their Routing and Remote Access Server (RRAS) Pack By setting up a VPN server, any clients running the supported operating systems (Windows 9x, 2000, and NT) can be configured to establish a PPTP VPN connection for little to no hardware cost (This assumes you have an NT server that could be configured as a VPN server and your users are currently using Windows NT, 9x, or 2000) The configurations and requirements to set up Microsoft's PPTP VPN solution are defined later in this chapter
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Another security feature provided by Cisco IOS is the automatic logging of system output error messages to a console terminal or syslog server This allows administrators to track and monitor abnormal activities and possible security breaches
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Cisco IOS requires entry of two different passwords (user EXEC and privileged EXEC) in order to execute configuration commands In previous IOS releases, access was pretty much all or nothing Now the privileges offer 16 levels of access User EXEC is level 1, fully privileged is level 15, and level 0 might be a guest who is only allowed to connect and disconnect The following commands show how to set up a user at level 5 and allow simple debugging, ping, and traceroutes Remember that you must be in the highest level configuration mode (at privilege level 15) in order to perform these configurations Router(config)#enable password level 5 password Router(config)#privilege exec level 5 debug frame-relay autoinstall Router(config)#privilege exec level 5 debug frame-relay events Router(config)#privilege exec level 5 debug frame-relay lmi Router(config)#privilege exec level 5 ping Router(config)#privilege exec level 5 trace The following commands are two ways to configure the fully privileged (level 15) password: Router(config)#enable password enablepassword Router(config)#enable password level 15 enablepassword
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Although the foregoing configuration options are useful, they may have certain limitations and can take time to accomplish for each potential user who needs access to network devices Cisco offers, in addition, the following add-on tools that enable you to control authentication, authorization, and accounting: TACACS+ Terminal Access Controller Access Control System RADIUS Remote Authentication Dial-in User Services These tools are defined in detail in 16 TipAlways use a username for logging in, whether you are logging in locally or using an AAA server Entering a username will provide an audit trail in the logs showing who has made changes
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