Apple 034-2351_Cvr manual Practical Examples, Block Access to Internet Users, Block Junk Mail

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Practical Examples

The IP filters you create work together to provide security for your network. The examples that follow show how to use filters to achieve some specific goals.

Block Access to Internet Users

This section shows you, as an example, how to allow users on your subnet access to your server’s Web service, but deny access to the general public on the Internet:

To do this:

1In Server Admin, choose Firewall from the Computers & Services list.

2Click Settings.

3Select the General tab.

4Select the Any address group.

5Make sure that Web Service is disabled in the right pane.

6Click the Add button to create an address range.

7Name the address group.

8Add the local network address range.

This is done by using an example address from the network with its network mask in CIDR notation. For example, if a user has an address of 192.168.1.20 and the network mask is 255.255.255.0, then enter 192.168.1.20/24.

9Click OK.

10Select your newly created address group.

11Select “Web Service” in the right pane to enable web access.

12Click Save.

Block Junk Mail

This section shows you, as an example, how to reject email from a junk mail sender with an IP address of 17.128.100.0 and accept all other Internet email:

Chapter 3 IP Firewall Service

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Contents Mac OS X Server Network Services Administration 034-2351/9-20-03 Contents Glossary Index How to Use This Guide Using This GuideWhat’s Included in This Guide Setting Up Mac OS X Server for the First Time Getting Help for Everyday Management TasksGetting Additional Information Before You Set Up Dhcp Service Dhcp ServiceCreating Subnets Using Static IP AddressesAssigning IP Addresses Dynamically Locating the Dhcp ServerUsing Multiple Dhcp Servers on a Network Setting Up Dhcp Service for the First TimeInteracting With Other Dhcp Servers Assigning Reserved IP AddressesStarting and Stopping Dhcp Service Managing Dhcp ServiceCreating Subnets in Dhcp Service Set up logs for Dhcp serviceTo change subnet settings Changing Subnet Settings in Dhcp ServiceDeleting Subnets From Dhcp Service Setting the DNS Server for a Dhcp SubnetChanging IP Address Lease Times for a Subnet Setting Ldap Options for a Subnet Setting Wins Options for a SubnetTo set Ldap options for a subnet Monitoring Dhcp Service Disabling Subnets TemporarilyViewing the Dhcp Status Overview Setting the Log Detail Level for Dhcp Service Viewing Dhcp Log EntriesViewing the Dhcp Client List Where to Find More Information DNS Service Setting Up DNS Service for the First Time Before You Set Up DNS ServiceSetting Up Multiple Name Servers DNS and BindLearn and plan Set up a mail exchange MX record optional Configure basic DNS settingsConfigure the reverse lookup zone optional Start DNS serviceStarting and Stopping DNS Service Managing DNS ServiceEnabling or Disabling Zone Transfers Enabling or Disabling RecursionAdding a Master Zone Managing ZonesAdding a Slave Zone To add a master zoneTo add a slave zone Duplicating a Zone Adding a Forward ZoneTo add a forward zone To duplicate a zoneModifying a Zone Managing RecordsDeleting a Zone To modify a zoneTo add a record Adding a Record to a ZoneDeleting a Record From a Zone Modifying a Record in a ZoneTo modify a record To delete a recordViewing DNS Service Activity Viewing DNS Service StatusMonitoring DNS Viewing DNS Log EntriesChanging DNS Log File Location Viewing DNS Usage StatisticsTo change the log detail level DNS Spoofing Securing the DNS ServerServer Mining To see DNS usage statisticsDenial-of-Service DoS DNS Service ProfilingTo specify zone transfer IP addresses To alter BIND’s version responseService Piggybacking Common Network Administration Tasks That Use DNS Service Setting Up MX RecordsExample.com To enable MX records Configuring DNS for Mail ServiceEnabling Redundant Mail Servers Edit the MX record of the primary mail serverTo enable backup or redundant mail servers Setting Up Namespace Behind a NAT RouterNetwork Load Distribution aka Round Robin Setting Up a Private TCP/IP NetworkConfiguring Bind Using the Command Line Hosting Several Internet Services With a Single IP AddressWhat Is BIND? Bind on Mac OS X Server Bind Configuration FilePractical Example Zone Data FilesSetting Up Sample Configuration Files To set up the sample filesConfiguring Clients Using DNS With Dynamically Assigned IP Addresses If you are using Mac OS X Server as your Dhcp ServerCheck Your Configuration Request For Comment Documents For more information on DNS and BIND, see the followingPage IP Firewall Service IP Firewall Service Understanding Firewall Filters What is a Filter?IP Address Subnet MaskCidr Using Address Ranges Rule Mechanism and PrecedenceMultiple IP Addresses Start firewall service Setting Up Firewall Service for the First TimeCreate an IP address group that filters will apply to Add filters to the IP filter listStarting and Stopping Firewall Service Managing Firewall ServiceOpening the Firewall for Standard Services Save firewall service changesTo open the firewall for standard services Creating an Address GroupTo create an address group Duplicating an Address Group Editing or Deleting an Address GroupCreating an Advanced IP Filter for TCP ports To edit or delete an address groupTo create an IP filter for TCP ports Creating an Advanced IP Filter for UDP PortsTo create an IP filter for UDP ports NFSTo change the Default setting Changing the Default FilterEditing Advanced IP Filters To edit advanced IP filtersSetting Up Logs for Firewall Service Monitoring Firewall ServiceViewing the Firewall Status Overview Viewing the Firewall LogViewing Packets Logged by Filter Rules Viewing Denied PacketsLog Example To view denied packetsPractical Examples Block Access to Internet UsersBlock Junk Mail To do thisAllow a Customer to Access the Apple File Server Preventing Denial-of-Service DoS Attacks To prevent ping denial-of-service attacksControlling or Enabling Peer-to-Peer Network Usage Advanced Configuration Controlling or Enabling Network Game UsageBackground Creating IP Filter Rules Using ipfw PrecautionsCreating IP Filter Rules Reviewing IP Filter RulesDeleting IP Filter Rules Port ReferencePptp VPN UDP port Used for Reference For more information about ipfw NAT Service Starting and Stopping NAT ServiceTo start NAT service Monitoring NAT Service Configuring NAT ServiceTo configure NAT service Viewing the NAT Status OverviewFor more information about natd To view the NAT divert logPage VPN Service VPN and Security Authentication MethodTransport Protocols Point to Point Tunneling Protocol PptpManaging VPN Service Before You Set Up VPN ServiceStarting or Stopping VPN Service Enabling and Configuring L2TP Transport ProtocolEnabling and Configuring Pptp Transport Protocol To enable L2TPTo enable Pptp Configuring VPN Network Routing Definitions Configuring Additional Network Settings for VPN ClientsTo configure addition network settings To set routing definitionsSetting the Log Detail Level for VPN Service Monitoring VPN ServiceSetting the VPN Log Archive Interval Viewing a VPN Status OverviewViewing VPN Client Connections Viewing the VPN LogTo view the log To view client connectionsPage How NTP Works NTP ServiceUsing NTP on Your Network Setting Up NTP ServiceTo set up NTP service To configure NTP on clients Configuring NTP on ClientsPage IPv6 Support IPv6 Addresses in the Server Admin IPv6 Enabled ServicesIPv6 Addresses NotationIPv6 Reserved Addresses IPv6 Addressing ModelIPv6 Address Types Where to Find More Information Glossary GlossaryGlossary Glossary Name server See DNS Domain Name System Search path See search policy UCE unsolicited commercial email See spam Glossary Page Index Dhcp VPN

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