Firewall, 104 | SnapGear 2.0.1 specs

4.	Dialin Setup	52
	Dialin Setup	53
	Dialin User Accounts	55
	Account list	56
	Remote User Configuration	58
5.	DHCP Server	63
	DHCP Server Configuration	63
	DHCP Proxy	67
6.	Firewall	68
	Incoming Access	68
	CyberGuard SG Administrative Web Server	70
	Packet Filtering	73
	NAT	77
	Rules	80
	Access Control and Content Filtering	81
7.	Intrusion Detection	89
	Basic Intrusion Detection and Blocking	91
	Advanced Intrusion Detection	93
8.	Web Cache	98
	Web Cache Setup	99
	Network Shares	100
	Peers	103
	Set up LAN PCs to Use the Web Cache	103
9.	Virtual Private Networking	104
	PPTP Client Setup	105
	PPTP Server Setup	107
	IPSec Setup	118
	Set up the Branch Office	118
	Configuring the Headquarters	132
	Tunnel List	136
	NAT Traversal Support	140
	Dynamic DNS Support	140
	Certificate Management	141
	Troubleshooting	147
	GRE	151
	L2TP	157

Image 3

SnapGear 2.0.1 user manual Firewall, 104

Contents

Revision June 7 Contents 104 Firewall 177 159169 170 Introduction CyberGuard SG Gateway AppliancesIntroduction CyberGuard SG PCI Appliances Secure by default Bridged mode Document Conventions Text like this highlights important issues Your CyberGuard SG Gateway Appliance Front panel LEDsSG300 model includes two blue straight through UTP cables Rear panel Virtual Private Networking is enabled DMZ link features SG570, SG575 only CyberGuard SG Gateway Appliance FeaturesInternet link features LAN link features LEDs Your CyberGuard SG PCI Appliance CyberGuard SG PCI Appliance Features Network link featuresEnvironmental features Getting Started 255.255.255.0 192.168.0.1Page Right click on Local Area Connection and select Properties 192.168.0.100 Set up the Password and LAN Connection Settings Root Getting Started Getting Started DSL modem Set up Internet Connection SettingsCable modem Analog modem Set up the PCs on your LAN to Access the Internet LAN with no Dhcp server LAN with a Dhcp server To manually set up each Windows PC on your network Select Dhcp Server from the Networking menu Getting Started Set up your PC to Connect to the Web Management Console Install the Network Driver on your PC Select Use the following DNS server addresses and enter Select Internet Protocol TCP/IP and click Properties Set up the Password and Network Connection Settings Network Setup Connections page will display Ensure Dhcp assigned is unchecked Click Apply and Reboot Getting Started Click Apply and Reboot Getting Started Page Network Connections ConnectionsNetwork Connections Bridging LAN Internet 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 DMZ as a second Internet connection Services on the DMZ NetworkDirect LAN Bridged LAN DMZ as a backup/failover Internet connection Load BalancingInternet Failover Set up a secondary backup Internet connection Enable the primary connection for failover Network Connections Routes Additional routesRoute management Advanced HostnameDNS Proxy Network Address Translation NAT/masquerading Dynamic DNS Interface aliases Change MAC address QoS Traffic Shaping Dialin Setup Dialin Setup Dialin Setup Following table describes the fields on the Dial-In Setup Dialin User Accounts Account list Page Windows 95/98/Me Remote User Configuration Dialin Setup Windows 2000/XP Dialin Setup Page Dhcp Server Configuration Dhcp ServerDhcp Server Dhcp Server Subnet Enable/DisableSubnet List Interface Dhcp Server Dhcp Proxy Incoming Access FirewallFirewall Administration services CyberGuard SG Administrative Web Server SSL/HTTPS Secure Http Add Local and Private Certificates SSL Certificate Setup Action Packet FilteringIncoming Interface Outgoing Interface Addresses Service groups Rules Enable Destination NAT/port forwardingDescriptive Name Destination Address Destination ServicesSource NAT Source Address To-1 NAT Rules User authentication Access Control and Content FilteringPage Click Advanced Browser setup IP lists Web lists Content Categories Reports ZoneAlarm Intrusion Detection Intrusion Detection Benefits 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 Cache size Web Cache Setup Network Shares Create a new user account100 Web Cache 101 Web Cache Create the network share 102 Web Cache Set the CyberGuard SG appliance to use the network share Set up LAN PCs to Use the Web Cache Peers103 Web Cache 104 Virtual Private Networking Virtual Private Networking Pptp Client Setup 106 Virtual Private Networking 107 Virtual Private Networking Pptp Server Setup 108 Virtual Private Networking Enable and configure the Pptp VPN server Data 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 112 Virtual Private Networking Configuring the remote VPN client Windows 95, Windows 98 and Windows Me 114 Virtual Private Networking Windows 115 Virtual Private Networking 116 Virtual Private Networking Windows XP 117 Virtual Private Networking Connecting the remote VPN client Enabling IPSec IPSec SetupSet up the Branch Office CyberGuard SG appliance to CyberGuard SG appliance 119 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 123 Virtual Private Networking Local endpoint settings 124 Virtual Private Networking 125 Virtual Private Networking Other options 126 Virtual Private Networking 127 Virtual Private Networking 128 Virtual Private Networking Tcgid Phase 1 settings Kept confidential129 Virtual Private Networking 130 Virtual Private Networking 131 Virtual Private Networking Phase 2 settings 132 Virtual Private Networking Configuring the Headquarters 133 Virtual Private Networking Remote endpoint settings Leave the Enable IP Payload Compression checkbox unchecked134 Virtual Private Networking 135 Virtual Private Networking 136 Virtual Private Networking Tunnel ListConnection Remote party 137 Virtual Private Networking Status 138 Virtual Private Networking 139 Virtual Private Networking NAT Traversal Support Dynamic DNS Support140 Virtual Private Networking Certificate Management Extracting certificates141 Virtual Private Networking 142 Virtual Private Networking Creating certificates 143 Virtual Private Networking Create the self-signed root CA certificate 144 Virtual Private Networking Adding certificates 145 Virtual Private Networking Adding a CA or CRL certificate 146 Virtual Private Networking Adding a local certificate 147 Virtual Private Networking Troubleshooting 148 Virtual Private Networking 149 Virtual Private Networking 150 Virtual Private Networking CyberGuard SG appliance in Slough Internet address Setting up a GRE tunnelCyberGuard SG appliance in Brisbane Internet address LAN address Remote subnet/netmask 10.1.0.0 GRE over IPSec 154 Virtual Private Networking 155 Virtual Private Networking Local Internal Address Place on Ethernet Bridge 156 Virtual Private Networking Troubleshooting 157 Virtual Private Networking L2TP VPN client 158 Virtual Private Networking L2TP server NTP time server SystemDate and Time Set date and time 160 System Locality 161 System Users User settings AdministrationDiagnostic Encrypted save/restore all Diagnostics DiagnosticsInternet access via access controls Password 164 System Network tests Configuration files System log165 System Flash upgrade Reset button Reboot Technical 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 171 Appendix B Terminology DNS 172 Appendix B Terminology IDB 173 Appendix B Terminology Isakmp 174 Appendix B Terminology NTP 175 Appendix B Terminology SHA 176 Appendix C System Log Access Logging Ppp Default DenyEth0 Eth1 179 Appendix C System Log Creating Custom Log Rules 180 Appendix C System Log 181 Appendix C System Log Iptables -I Forward -j LOG -i eth0 -p tcp 182 Appendix C System Log Rate Limiting Administrative Access Logging Boot Log Messages183 Appendix C System Log 184 Appendix D Firmware Upgrade Practices and Precaut ions Appendix D Firmware Upgrade Practices and Precautions