Apple 034-2351_Cvr manual Setting Up Firewall Service for the First Time, Start firewall service

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Setting Up Firewall Service for the First Time

Once you’ve decided which filters you need to create, follow these overview steps to set up firewall service. If you need more help to perform any of these steps, see “Managing Firewall Service” on page 49 and the other topics referred to in the steps.

Step 1: Learn and plan

If you’re new to working with IP Firewall, learn and understand firewall concepts, tools, and features of Mac OS X Server and BIND. For more information, see “Understanding Firewall Filters” on page 45.

Then plan your IP Firewall Service by planning which services you want to provide access to. Mail, web, and FTP services generally require access from computers on the Internet. File and print services will most likely be restricted to your local subnet.

Once you decide which services you want to protect using firewall service, you need to determine which IP addresses you want to allow access to your server, and which IP addresses you want to deny access to your server. Then you can create the appropriate filters.

Step 2: Start firewall service

In Server Admin, select Firewall and click Start Service. By default, this blocks all incoming ports except those used to configure the server remotely. If you’re configuring the server locally, turn off external access immediately.

Important: If you add or change a filter after starting firewall service, the new filter will affect connections already established with the server. For example, if you deny all access to your FTP server after starting firewall service, computers already connected to your FTP server will be disconnected.

Step 3: Create an IP address group that filters will apply to

By default, there is an address group created for all incoming IP addresses. Filters applied to this group will effect all incoming network traffic.

You can create additional groups based on source IP number or destination IP number.

See “Creating an Address Group” on page 50 for more information.

Step 4: Add filters to the IP filter list

Read “Understanding Firewall Filters” on page 45 to learn how IP filters work and how to create them. You use this to further all other services, strengthen your network security, and manage your network traffic through the firewall.

For information about creating a new filter, see “Creating an Advanced IP Filter for TCP ports” on page 51.

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 Dhcp Service Before You Set Up Dhcp ServiceUsing Static IP Addresses Creating SubnetsAssigning IP Addresses Dynamically Locating the Dhcp ServerSetting Up Dhcp Service for the First Time Using Multiple Dhcp Servers on a NetworkInteracting With Other Dhcp Servers Assigning Reserved IP AddressesManaging Dhcp Service Starting and Stopping Dhcp ServiceCreating Subnets in Dhcp Service Set up logs for Dhcp serviceChanging Subnet Settings in Dhcp Service To change subnet settingsDeleting 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 Before You Set Up DNS Service Setting Up DNS Service for the First TimeSetting Up Multiple Name Servers DNS and BindLearn and plan Configure basic DNS settings Set up a mail exchange MX record optionalConfigure the reverse lookup zone optional Start DNS serviceManaging DNS Service Starting and Stopping DNS ServiceEnabling or Disabling Zone Transfers Enabling or Disabling RecursionManaging Zones Adding a Master ZoneAdding a Slave Zone To add a master zoneTo add a slave zone Adding a Forward Zone Duplicating a ZoneTo add a forward zone To duplicate a zoneManaging Records Modifying a ZoneDeleting a Zone To modify a zoneAdding a Record to a Zone To add a recordModifying a Record in a Zone Deleting a Record From a ZoneTo modify a record To delete a recordViewing DNS Service Status Viewing DNS Service ActivityMonitoring DNS Viewing DNS Log EntriesChanging DNS Log File Location Viewing DNS Usage StatisticsTo change the log detail level Securing the DNS Server DNS SpoofingServer Mining To see DNS usage statisticsDNS Service Profiling Denial-of-Service DoSTo 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 Configuring DNS for Mail Service To enable MX recordsEnabling Redundant Mail Servers Edit the MX record of the primary mail serverSetting Up Namespace Behind a NAT Router To enable backup or redundant mail serversSetting Up a Private TCP/IP Network Network Load Distribution aka Round RobinConfiguring Bind Using the Command Line Hosting Several Internet Services With a Single IP AddressWhat Is BIND? Bind Configuration File Bind on Mac OS X ServerPractical 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 For more information on DNS and BIND, see the following Request For Comment DocumentsPage IP Firewall Service IP Firewall Service What is a Filter? Understanding Firewall FiltersIP Address Subnet MaskCidr Using Address Ranges Rule Mechanism and PrecedenceMultiple IP Addresses Setting Up Firewall Service for the First Time Start firewall serviceCreate an IP address group that filters will apply to Add filters to the IP filter listManaging Firewall Service Starting and Stopping 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 Editing or Deleting an Address Group Duplicating an Address GroupCreating an Advanced IP Filter for TCP ports To edit or delete an address groupCreating an Advanced IP Filter for UDP Ports To create an IP filter for TCP portsNFS To create an IP filter for UDP portsChanging the Default Filter To change the Default settingEditing Advanced IP Filters To edit advanced IP filtersMonitoring Firewall Service Setting Up Logs for Firewall ServiceViewing the Firewall Status Overview Viewing the Firewall LogViewing Denied Packets Viewing Packets Logged by Filter RulesLog Example To view denied packetsBlock Access to Internet Users Practical ExamplesBlock 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 Precautions Creating IP Filter Rules Using ipfwReviewing IP Filter Rules Creating IP Filter RulesPort Reference Deleting IP Filter RulesPptp VPN UDP port Used for Reference For more information about ipfw NAT Service Starting and Stopping NAT ServiceTo start NAT service Configuring NAT Service Monitoring NAT ServiceTo configure NAT service Viewing the NAT Status OverviewTo view the NAT divert log For more information about natdPage VPN Service Authentication Method VPN and SecurityTransport Protocols Point to Point Tunneling Protocol PptpBefore You Set Up VPN Service Managing VPN ServiceStarting or Stopping VPN Service Enabling and Configuring L2TP Transport ProtocolEnabling and Configuring Pptp Transport Protocol To enable L2TPTo enable Pptp Configuring Additional Network Settings for VPN Clients Configuring VPN Network Routing DefinitionsTo configure addition network settings To set routing definitionsMonitoring VPN Service Setting the Log Detail Level for VPN ServiceSetting the VPN Log Archive Interval Viewing a VPN Status OverviewViewing the VPN Log Viewing VPN Client ConnectionsTo view the log To view client connectionsPage NTP Service How NTP WorksUsing NTP on Your Network Setting Up NTP ServiceTo set up NTP service Configuring NTP on Clients To configure NTP on clientsPage IPv6 Support IPv6 Enabled Services IPv6 Addresses in the Server AdminIPv6 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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