SnapGear 1.7.8 manual Outgoing access, Security group classes configuration

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Outgoing access

Your SnapGear appliance can be configured to restrict network traffic going out the Internet interface. These restrictions can be applied to specific hosts or networks (defined by IP address), or globally across all hosts on your internal LAN.

Outgoing Access restrictions are applied by denying a group of services (e.g. web and email) from specific hosts or networks or globally across all hosts.

Your SnapGear appliance’s Outgoing Access Restrictions are configured using security group classes. Click the security group classes link on the Outgoing Access Configuration page to set the restrictions for each security group class. Each security group class can be configured to restrict certain TCP/IP application protocols or to block specified TCP and UDP ports as shown in the following figure:

Figure 6.4 Security group classes configuration

You can specify the restrictions for each security group class to impose, and apply the restrictions globally to all machines on your local network or to specific machines or networks.

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Firewall

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Contents Rev May 2nd Table of contents Virtual Private Networking Introduction Term Meaning TerminologyLAN TCP/IP Document conventionsStep Chapter Installing and configuring your SnapGear applianceLabel Activity Description Your SnapGear applianceLEDs SnapGear appliance back panels Network interconnections Software features SnapGear appliance featuresDial-in connection features Internet link featuresLAN link features Environmental features Getting started Static IP reset10.0.0.0 10.255.255.255 10/8 prefix New Networks192.168.0.0 192.168.0.255 192.168.0/24 prefix Configuring the SnapGear appliance on your network Page Set up IP addresses Multiple SnapGear appliances were found on the network Your SnapGear appliance was found on the networkYour SnapGear appliance needs an IP address SnapGear Management Console web administration pages Administrative passwordUsing linsetip Initial setup using LinuxPing -b subnet broadcast address Arp -a Using an existing local Dhcp or Bootp serverEdit the /etc/inetd.conf file Configuring a new local Dhcp or Bootp serverSnapGear Quick Setup LAN port quick setup LAN port quick setupISP connection quick setup ISP connection quick setupGetting started Configuring the PCs on your network TCP/IP properties Physically connect modem device Connecting to the InternetConnect to Internet Adsl Select Internet connectionConnect to Internet cable modem Connect to Internet modem Connect to Internet directField Description ISP. The Password and Confirm Password fields mustInternet failover Advanced configuration optionFollowing figure shows the failover configuration screen Failed connection Establishing the connection Configure PCs to use SnapGear appliance Internet gatewayDial-in server configuration Dial-in server configuration Dial-in setup Dial-in setupField Description Dial-in user account creation Dial-in user accountsFollowing figure shows the user maintenance screen Account list Dial-in password errorFor Windows 95 and Windows Remote user configurationServer types Connect to dialogue box WindowsClick Next to continue 11 Connection availability 13 Remote access login screen IP configuration Network configurationNetwork configuration Advanced IP configuration Advanced IP configurationNetwork configuration Dhcp server Dhcp server configurationNetwork configuration Additional routes Advanced networkingTraffic shaping Firewall Incoming accessIncoming access configuration Incoming access administration servicesConfigure external access to services External access to servicesPort forwarding Port forwarding configurationSecurity group classes configuration Outgoing accessFirewall rules Outgoing access settingsIntrusion detection and blocking Intrusion detection and blocking configurationPage Content filtering Content filtering Filtering Level Description Filtering levels and reportingVirtual Private Networking 1VPN tunneling using the Pptp serverPptp client setup Pptp client configuration Pptp server setup Pptp server setup Enable and configure the Pptp VPN serverField Description 4PPTP VPN server accounts screen Configuring user accounts for VPN serverVirtual Private Networking VPN Pptp IP address Configuring the remote VPN clientVirtual Private Networking Windows 95 and Windows VPN client setupYour VPN client is now set up correctly Windows NT Network and dial-up connections This displays the Destination Address window Connecting the remote VPN client 12 IPSec setup IPSec setup13 Add new IPSec connection Virtual Private Networking 14 Automatic keying setup Technique Description Aggressive mode phase 1 settingsIPSec interoperability Time server PasswordSystem Advanced DiagnosticsReset button Flash upgradeTechnical support Technical supportLED Pattern Status Action Appendix a LED status patternsAppendix B System Log Access LoggingEth0 Default DenyEth1 PppCreating Custom Log Rules Forward Iptables -I Forward -j LOG -i eth+ -o eth+ -p tcp Rate Limiting Administrative Access LoggingBoot Log Messages