Manuals / SnapGear / Computer Equipment / Network Card

SnapGear 2.0.1 user manual Web Cache, Web cache is only available on SG575 models

Models: 2.0.1

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8. Web Cache

Note

The web cache is only available on SG575 models.

Web browsers running on PCs on your LAN can use the CyberGuard SG appliance’s proxy-cache server to reduce Internet access time and bandwidth consumption.

A proxy-cache server implements Internet object caching. This is a way to store requested Internet objects (i.e., data available via HTTP, FTP, and other protocols) on a server closer to the user's network than on the remote site. Typically the proxy-cache server eliminates the need to re-download Internet objects over the available Internet connection when several users attempt to access the same web site simultaneously. The objects will be available in the cache (server memory or disk) and quickly accessible over the LAN rather than the slower Internet link.

The CyberGuard SG appliance’s web cache keeps objects cached in memory and on a LAN network share, caches Internet name (DNS) lookups and implements negative caching of failed requests.

Using the lightweight Internet Cache Protocol, multiple web caches can be arranged in a hierarchy or mesh. This allows web cache peers to pull objects from each other’s caches, further improving the performance of web access for an organisation with multiple Internet gateway.

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Web Cache

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SnapGear 2.0.1 user manual Web Cache, Web cache is only available on SG575 models

Contents

Revision June 7 Contents Firewall 104170 159169 177Introduction CyberGuard SG Gateway AppliancesIntroduction CyberGuard SG PCI Appliances Bridged mode Secure by defaultText like this highlights important issues Document ConventionsYour CyberGuard SG Gateway Appliance Front panel LEDsSG300 model includes two blue straight through UTP cables Virtual Private Networking is enabled Rear panelLAN link features CyberGuard SG Gateway Appliance FeaturesInternet link features DMZ link features SG570, SG575 onlyYour CyberGuard SG PCI Appliance LEDsCyberGuard SG PCI Appliance Features Network link featuresEnvironmental features Getting Started 192.168.0.1 255.255.255.0Page Right click on Local Area Connection and select Properties Set up the Password and LAN Connection Settings 192.168.0.100Root Getting Started Getting Started Analog modem Set up Internet Connection SettingsCable modem DSL modemSet up the PCs on your LAN to Access the Internet LAN with a Dhcp server LAN with no Dhcp serverTo manually set up each Windows PC on your network Select Dhcp Server from the Networking menu Getting Started Install the Network Driver on your PC Set up your PC to Connect to the Web Management ConsoleSelect Internet Protocol TCP/IP and click Properties Select Use the following DNS server addresses and enterSet up the Password and Network Connection Settings Network Setup Connections page will display Click Apply and Reboot Ensure Dhcp assigned is uncheckedGetting Started Click Apply and Reboot Getting Started Page Network Connections ConnectionsNetwork Connections LAN BridgingInternet Internet Connection Methods Physically connect modem deviceCable Direct Internet Bridged Internet COM/Modem Failover Direct/Cable/ADSL InternetDialout Internet ISP. The Password and Confirm Password fields must Field DescriptionOptional Dialin access Direct DMZBridged DMZ Bridged LAN Services on the DMZ NetworkDirect LAN DMZ as a second Internet connectionDMZ as a backup/failover Internet connection Load BalancingInternet Failover Enable the primary connection for failover Set up a secondary backup Internet connectionNetwork Connections Routes Additional routesRoute management Advanced HostnameDNS Proxy Network Address Translation NAT/masquerading Dynamic DNS Interface aliases QoS Traffic Shaping Change MAC addressDialin Setup Dialin SetupDialin Setup Following table describes the fields on the Dial-In Setup Dialin User Accounts Account list Page Remote User Configuration Windows 95/98/MeDialin Setup Windows 2000/XP Dialin Setup Page Dhcp Server Configuration Dhcp ServerDhcp Server Dhcp Server Interface Enable/DisableSubnet List SubnetDhcp Server Dhcp Proxy Incoming Access FirewallFirewall Administration services CyberGuard SG Administrative Web Server SSL/HTTPS Secure Http SSL Certificate Setup Add Local and Private CertificatesOutgoing Interface Packet FilteringIncoming Interface ActionAddresses Service groups Rules Enable Destination NAT/port forwardingDescriptive Name Source Address Destination ServicesSource NAT Destination AddressTo-1 NAT Rules Access Control and Content Filtering User authenticationPage Browser setup Click AdvancedIP lists Web lists Content Reports CategoriesZoneAlarm Intrusion Detection Intrusion DetectionBenefits of using an IDS Basic Intrusion Detection and Blocking Page Advanced Intrusion Detection Advanced Intrusion Detection configuration Intrusion Detection Setting up the analysis server Page Web Cache Web cache is only available on SG575 modelsWeb Cache Web Cache Setup Cache sizeNetwork Shares Create a new user account100 Web Cache Create the network share 101 Web CacheSet the CyberGuard SG appliance to use the network share 102 Web CacheSet up LAN PCs to Use the Web Cache Peers103 Web Cache Virtual Private Networking 104 Virtual Private NetworkingPptp Client Setup 106 Virtual Private Networking Pptp Server Setup 107 Virtual Private NetworkingEnable and configure the Pptp VPN server 108 Virtual Private NetworkingData private as well as providing secure authentication Encryption is strongly recommended. This keeps your109 Virtual Private Networking Configuring user accounts for VPN server 111 Virtual Private Networking Configuring the remote VPN client 112 Virtual Private NetworkingWindows 95, Windows 98 and Windows Me Windows 114 Virtual Private Networking115 Virtual Private Networking Windows XP 116 Virtual Private NetworkingConnecting the remote VPN client 117 Virtual Private NetworkingCyberGuard SG appliance to CyberGuard SG appliance IPSec SetupSet up the Branch Office Enabling IPSec119 Virtual Private Networking Configure a tunnel to connect to the headquarters office Tunnel settings120 Virtual Private Networking 121 Virtual Private Networking 122 Virtual Private Networking Local endpoint settings 123 Virtual Private Networking124 Virtual Private Networking Other options 125 Virtual Private Networking126 Virtual Private Networking 127 Virtual Private Networking Tcgid 128 Virtual Private NetworkingPhase 1 settings Kept confidential129 Virtual Private Networking 130 Virtual Private Networking Phase 2 settings 131 Virtual Private NetworkingConfiguring the Headquarters 132 Virtual Private Networking133 Virtual Private Networking Remote endpoint settings Leave the Enable IP Payload Compression checkbox unchecked134 Virtual Private Networking 135 Virtual Private Networking Remote party Tunnel ListConnection 136 Virtual Private NetworkingStatus 137 Virtual Private Networking138 Virtual Private Networking 139 Virtual Private Networking NAT Traversal Support Dynamic DNS Support140 Virtual Private Networking Certificate Management Extracting certificates141 Virtual Private Networking Creating certificates 142 Virtual Private NetworkingCreate the self-signed root CA certificate 143 Virtual Private NetworkingAdding certificates 144 Virtual Private NetworkingAdding a CA or CRL certificate 145 Virtual Private NetworkingAdding a local certificate 146 Virtual Private NetworkingTroubleshooting 147 Virtual Private Networking148 Virtual Private Networking 149 Virtual Private Networking 150 Virtual Private Networking LAN address Setting up a GRE tunnelCyberGuard SG appliance in Brisbane Internet address CyberGuard SG appliance in Slough Internet addressRemote subnet/netmask 10.1.0.0 GRE over IPSec 154 Virtual Private Networking Local Internal Address Place on Ethernet Bridge 155 Virtual Private NetworkingTroubleshooting 156 Virtual Private NetworkingL2TP VPN client 157 Virtual Private NetworkingL2TP server 158 Virtual Private NetworkingSet date and time SystemDate and Time NTP time serverLocality 160 SystemUsers 161 SystemEncrypted save/restore all AdministrationDiagnostic User settingsPassword DiagnosticsInternet access via access controls DiagnosticsNetwork tests 164 SystemConfiguration files System log165 System Flash upgrade Reboot Reset buttonTechnical Support Appendix a IP Address Ranges B.c.d B.c.d-e B.c.d-e.f.g.h B.c.d/e169 Appendix a IP Address Ranges Appendix B Terminology Term Meaning170 Appendix B Terminology DNS 171 Appendix B TerminologyIDB 172 Appendix B TerminologyIsakmp 173 Appendix B TerminologyNTP 174 Appendix B TerminologySHA 175 Appendix B Terminology176 Access Logging Appendix C System LogEth1 Default DenyEth0 PppCreating Custom Log Rules 179 Appendix C System Log180 Appendix C System Log Iptables -I Forward -j LOG -i eth0 -p tcp 181 Appendix C System LogRate Limiting 182 Appendix C System LogAdministrative Access Logging Boot Log Messages183 Appendix C System Log Appendix D Firmware Upgrade Practices and Precautions 184 Appendix D Firmware Upgrade Practices and Precaut ions