IP Firewall Service | Apple 034-2351

IP Firewall Service	3

Firewall service is software that protects the network applications running on your Mac OS X Server. Turning on firewall service is similar to erecting a wall to limit access. Firewall service scans incoming IP packets and rejects or accepts these packets based on the set of filters you create. You can restrict access to any IP service running on the server, and you can customize filters for all incoming clients or for a range of client IP addresses.

The illustration below shows an example firewall process.

Is there a

filter

Locate the

for port 80?

Any Port filter

with the most

specific range

Yes

that includes

A computer with IP

The server begins

the address

address 10.221.41.33

looking for filters.

10.221.41.33.

attempts to connect to

Is there a filter

containing

the server over the

IP address

Internet (port 80).

10.221.41.33?

Yes

What does the

filter specify?

Deny

Allow

Connection

is made.

is refused.

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Apple 034-2351_Cvr manual IP Firewall Service

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Contents

Mac OS X Server Network Services Administration 034-2351/9-20-03 Contents Glossary Index Using This Guide How to Use This GuideWhat’s Included in This Guide Getting Help for Everyday Management Tasks Setting Up Mac OS X Server for the First TimeGetting Additional Information Before You Set Up Dhcp Service Dhcp Service Locating the Dhcp Server Using Static IP AddressesCreating Subnets Assigning IP Addresses Dynamically Assigning Reserved IP Addresses Setting Up Dhcp Service for the First TimeUsing Multiple Dhcp Servers on a Network Interacting With Other Dhcp Servers Set up logs for Dhcp service Managing Dhcp ServiceStarting and Stopping Dhcp Service Creating Subnets in Dhcp Service To change subnet settings Changing Subnet Settings in Dhcp Service Setting the DNS Server for a Dhcp Subnet Deleting Subnets From Dhcp ServiceChanging IP Address Lease Times for a Subnet Setting Wins Options for a Subnet Setting Ldap Options for a SubnetTo set Ldap options for a subnet Disabling Subnets Temporarily Monitoring Dhcp ServiceViewing the Dhcp Status Overview Viewing Dhcp Log Entries Setting the Log Detail Level for Dhcp ServiceViewing the Dhcp Client List Where to Find More Information DNS Service DNS and Bind Before You Set Up DNS ServiceSetting Up DNS Service for the First Time Setting Up Multiple Name Servers Learn and plan Start DNS service Configure basic DNS settingsSet up a mail exchange MX record optional Configure the reverse lookup zone optional Enabling or Disabling Recursion Managing DNS ServiceStarting and Stopping DNS Service Enabling or Disabling Zone Transfers Adding a Master Zone Managing Zones To add a master zone Adding a Slave ZoneTo add a slave zone To duplicate a zone Adding a Forward ZoneDuplicating a Zone To add a forward zone To modify a zone Managing RecordsModifying a Zone Deleting a Zone To add a record Adding a Record to a Zone To delete a record Modifying a Record in a ZoneDeleting a Record From a Zone To modify a record Viewing DNS Log Entries Viewing DNS Service StatusViewing DNS Service Activity Monitoring DNS Viewing DNS Usage Statistics Changing DNS Log File LocationTo change the log detail level To see DNS usage statistics Securing the DNS ServerDNS Spoofing Server Mining To alter BIND’s version response DNS Service ProfilingDenial-of-Service DoS To specify zone transfer IP addresses Service Piggybacking Setting Up MX Records Common Network Administration Tasks That Use DNS ServiceExample.com Edit the MX record of the primary mail server Configuring DNS for Mail ServiceTo enable MX records Enabling Redundant Mail Servers To enable backup or redundant mail servers Setting Up Namespace Behind a NAT Router Network Load Distribution aka Round Robin Setting Up a Private TCP/IP Network Hosting Several Internet Services With a Single IP Address Configuring Bind Using the Command LineWhat Is BIND? Zone Data Files Bind Configuration FileBind on Mac OS X Server Practical Example To set up the sample files Setting Up Sample Configuration FilesConfiguring Clients If you are using Mac OS X Server as your Dhcp Server Using DNS With Dynamically Assigned IP AddressesCheck Your Configuration Request For Comment Documents For more information on DNS and BIND, see the followingPage IP Firewall Service IP Firewall Service Subnet Mask What is a Filter?Understanding Firewall Filters IP Address Cidr Rule Mechanism and Precedence Using Address RangesMultiple IP Addresses Add filters to the IP filter list Setting Up Firewall Service for the First TimeStart firewall service Create an IP address group that filters will apply to Save firewall service changes Managing Firewall ServiceStarting and Stopping Firewall Service Opening the Firewall for Standard Services Creating an Address Group To open the firewall for standard servicesTo create an address group To edit or delete an address group Editing or Deleting an Address GroupDuplicating an Address Group Creating an Advanced IP Filter for TCP ports To create an IP filter for TCP ports Creating an Advanced IP Filter for UDP Ports To create an IP filter for UDP ports NFS To edit advanced IP filters Changing the Default FilterTo change the Default setting Editing Advanced IP Filters Viewing the Firewall Log Monitoring Firewall ServiceSetting Up Logs for Firewall Service Viewing the Firewall Status Overview To view denied packets Viewing Denied PacketsViewing Packets Logged by Filter Rules Log Example To do this Block Access to Internet UsersPractical Examples Block Junk Mail Allow a Customer to Access the Apple File Server To prevent ping denial-of-service attacks Preventing Denial-of-Service DoS AttacksControlling or Enabling Peer-to-Peer Network Usage Controlling or Enabling Network Game Usage Advanced ConfigurationBackground Creating IP Filter Rules Using ipfw Precautions Creating IP Filter Rules Reviewing IP Filter Rules Deleting IP Filter Rules Port Reference Pptp VPN UDP port Used for Reference For more information about ipfw Starting and Stopping NAT Service NAT ServiceTo start NAT service Viewing the NAT Status Overview Configuring NAT ServiceMonitoring NAT Service To configure NAT service For more information about natd To view the NAT divert logPage VPN Service Point to Point Tunneling Protocol Pptp Authentication MethodVPN and Security Transport Protocols Enabling and Configuring L2TP Transport Protocol Before You Set Up VPN ServiceManaging VPN Service Starting or Stopping VPN Service To enable L2TP Enabling and Configuring Pptp Transport ProtocolTo enable Pptp To set routing definitions Configuring Additional Network Settings for VPN ClientsConfiguring VPN Network Routing Definitions To configure addition network settings Viewing a VPN Status Overview Monitoring VPN ServiceSetting the Log Detail Level for VPN Service Setting the VPN Log Archive Interval To view client connections Viewing the VPN LogViewing VPN Client Connections To view the logPage How NTP Works NTP Service Setting Up NTP Service Using NTP on Your NetworkTo set up NTP service To configure NTP on clients Configuring NTP on ClientsPage IPv6 Support Notation IPv6 Enabled ServicesIPv6 Addresses in the Server Admin IPv6 Addresses IPv6 Addressing Model IPv6 Reserved AddressesIPv6 Address Types Where to Find More Information Glossary Glossary Glossary Glossary Name server See DNS Domain Name System Search path See search policy UCE unsolicited commercial email See spam Glossary Page Index Dhcp VPN