Apple 034-2351_Cvr manual Setting Up Namespace Behind a NAT Router

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Step 2: Create records and priorities for the auxiliary mail servers

These instruction assume you have edited the original MX record. If not, please do so before proceeding.

These instructions also assume you have already set up and configured one or more auxiliary mail servers.

To enable backup or redundant mail servers:

1In Server Admin, select DNS in the Computers & Services pane.

2Click Settings.

3Select the Zones tab.

4Select the Zone you want to use.

5Click the Add button under the Records pane.

6Choose MX from the Type pop-up menu.

7Enter the domain name (like ‘example.com.’) in the From field.

8Enter the name of the mail server (like ‘backup.example.com.’) in the To field.

9Enter a precedence number for that server which is higher than that of the primary server.

A higher the number indicates it will be chosen if the primary server is unavailable.

10Click OK.

Setting Up Namespace Behind a NAT Router

If you’re behind a Network Address Translation (NAT) router, you have a special set of IP addresses that are only usable within the NAT environment. If you were to assign a domain name to these addresses outside of the NAT router, none of your domain names would resolve to the correct computer. See Chapter 4, “NAT Service,” on page 67 for more information about NAT.

You can, however, run a DNS service behind the router, assigning host names to the NAT IP addresses. This way, if you’re behind the NAT router, you can enter domain names rather than IP addresses to access servers, services, and workstations. Your DNS server should also have a Forwarding zone to send DNS requests outside of the NAT router to allow resolution of names outside the routed area. Your clients’ networking settings should specify the DNS server behind the NAT router. The process of setting up one of these networks is the same as setting up a private network. See “Setting Up a Private TCP/IP Network” on page 36 for more information.

If you choose to do this, names entered by users outside the NAT router won’t resolve to the addresses behind it. You should set the DNS records outside the NAT-routed area to point to the NAT router, and use NAT port forwarding to access computers behind the NAT router. For more information on port forwarding, see Chapter 4, “NAT Service,” on page 67.

Chapter 2 DNS Service

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Contents Mac OS X Server Network Services Administration 034-2351/9-20-03 Contents Glossary Index What’s Included in This Guide How to Use This GuideUsing This Guide Getting Additional Information Setting Up Mac OS X Server for the First TimeGetting Help for Everyday Management Tasks Before You Set Up Dhcp Service Dhcp ServiceLocating the Dhcp Server Using Static IP AddressesCreating Subnets Assigning IP Addresses DynamicallyAssigning Reserved IP Addresses Setting Up Dhcp Service for the First TimeUsing Multiple Dhcp Servers on a Network Interacting With Other Dhcp ServersSet up logs for Dhcp service Managing Dhcp ServiceStarting and Stopping Dhcp Service Creating Subnets in Dhcp ServiceTo change subnet settings Changing Subnet Settings in Dhcp ServiceChanging IP Address Lease Times for a Subnet Deleting Subnets From Dhcp ServiceSetting the DNS Server for a Dhcp Subnet To set Ldap options for a subnet Setting Ldap Options for a SubnetSetting Wins Options for a Subnet Viewing the Dhcp Status Overview Monitoring Dhcp ServiceDisabling Subnets Temporarily Viewing the Dhcp Client List Setting the Log Detail Level for Dhcp ServiceViewing Dhcp Log Entries 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 ServersLearn and plan Start DNS service Configure basic DNS settingsSet up a mail exchange MX record optional Configure the reverse lookup zone optionalEnabling or Disabling Recursion Managing DNS ServiceStarting and Stopping DNS Service Enabling or Disabling Zone TransfersAdding a Master Zone Managing ZonesTo add a slave zone Adding a Slave ZoneTo add a master zone To duplicate a zone Adding a Forward ZoneDuplicating a Zone To add a forward zoneTo modify a zone Managing RecordsModifying a Zone Deleting a ZoneTo add a record Adding a Record to a ZoneTo delete a record Modifying a Record in a ZoneDeleting a Record From a Zone To modify a recordViewing DNS Log Entries Viewing DNS Service StatusViewing DNS Service Activity Monitoring DNSTo change the log detail level Changing DNS Log File LocationViewing DNS Usage Statistics To see DNS usage statistics Securing the DNS ServerDNS Spoofing Server MiningTo alter BIND’s version response DNS Service ProfilingDenial-of-Service DoS To specify zone transfer IP addressesService Piggybacking Example.com Common Network Administration Tasks That Use DNS ServiceSetting Up MX Records Edit the MX record of the primary mail server Configuring DNS for Mail ServiceTo enable MX records Enabling Redundant Mail ServersTo enable backup or redundant mail servers Setting Up Namespace Behind a NAT RouterNetwork Load Distribution aka Round Robin Setting Up a Private TCP/IP NetworkWhat Is BIND? Configuring Bind Using the Command LineHosting Several Internet Services With a Single IP Address Zone Data Files Bind Configuration FileBind on Mac OS X Server Practical ExampleConfiguring Clients Setting Up Sample Configuration FilesTo set up the sample files Check Your Configuration Using DNS With Dynamically Assigned IP AddressesIf you are using Mac OS X Server as your Dhcp Server 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 AddressCidr Multiple IP Addresses Using Address RangesRule Mechanism and Precedence 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 toSave firewall service changes Managing Firewall ServiceStarting and Stopping Firewall Service Opening the Firewall for Standard ServicesTo create an address group To open the firewall for standard servicesCreating 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 portsTo create an IP filter for TCP ports Creating an Advanced IP Filter for UDP PortsTo create an IP filter for UDP ports NFSTo edit advanced IP filters Changing the Default FilterTo change the Default setting Editing Advanced IP FiltersViewing the Firewall Log Monitoring Firewall ServiceSetting Up Logs for Firewall Service Viewing the Firewall Status OverviewTo view denied packets Viewing Denied PacketsViewing Packets Logged by Filter Rules Log ExampleTo do this Block Access to Internet UsersPractical Examples Block Junk MailAllow a Customer to Access the Apple File Server Controlling or Enabling Peer-to-Peer Network Usage Preventing Denial-of-Service DoS AttacksTo prevent ping denial-of-service attacks Background Advanced ConfigurationControlling or Enabling Network Game Usage 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 To start NAT service NAT ServiceStarting and Stopping NAT Service Viewing the NAT Status Overview Configuring NAT ServiceMonitoring NAT Service To configure NAT serviceFor more information about natd To view the NAT divert logPage VPN Service Point to Point Tunneling Protocol Pptp Authentication MethodVPN and Security Transport ProtocolsEnabling and Configuring L2TP Transport Protocol Before You Set Up VPN ServiceManaging VPN Service Starting or Stopping VPN ServiceTo enable Pptp Enabling and Configuring Pptp Transport ProtocolTo enable L2TP To set routing definitions Configuring Additional Network Settings for VPN ClientsConfiguring VPN Network Routing Definitions To configure addition network settingsViewing a VPN Status Overview Monitoring VPN ServiceSetting the Log Detail Level for VPN Service Setting the VPN Log Archive IntervalTo view client connections Viewing the VPN LogViewing VPN Client Connections To view the logPage How NTP Works NTP ServiceTo set up NTP service Using NTP on Your NetworkSetting Up NTP Service To configure NTP on clients Configuring NTP on ClientsPage IPv6 Support Notation IPv6 Enabled ServicesIPv6 Addresses in the Server Admin IPv6 AddressesIPv6 Address Types IPv6 Reserved AddressesIPv6 Addressing Model 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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