Apple 034-2351_Cvr manual Creating an Advanced IP Filter for UDP Ports

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To create an IP filter for TCP ports:

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

2Click Settings.

3Select the Advanced tab.

4Click the New button.

Alternatively, you can select a rule similar to the one you want to create, and click Duplicate then Edit.

5Select whether this filter will allow or deny access in the Action pop-up menu.

6Choose TCP from the Protocol pop-up menu.

7Choose a TCP service from the pop-up menu.

If you want to select a nonstandard service port, choose Other.

8If desired, choose to log packets that match the filter.

9Enter the Source IP address range you want to filter.

If you want it to apply to any address, choose Any from the pop-up menu.

If you have selected a nonstandard service port, enter the source port number.

10Enter the Destination IP address range you want to filter.

If you want it to apply to any address, choose Any from the pop-up menu.

If you have selected a nonstandard service port, enter the source port number.

11Choose which network interface this filter applies to.

12Click OK.

13Click Save to apply the filter immediately.

Creating an Advanced IP Filter for UDP Ports

You can use the Advanced Settings pane to configure very specific filters for UDP ports. Many services use User Datagram Protocol (UDP) to communicate with the server. By default, all UDP connections are allowed. You should apply filters to UDP ports sparingly, if at all, because “deny” filters could create severe congestion in your server traffic.

If you filter UDP ports, don’t select the “Log all allowed packets” option in the filter configuration windows in Server Admin. Since UDP is a “connectionless” protocol, every packet to a UDP port will be logged if you select this option.

You should also allow UDP port access for specific services, including:

•DNS

•DHCP

•SLP

•Windows Name Service browsing

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 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 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 settingsSetting 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 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 ZoneTo add a master zone Adding a Slave 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 EntriesViewing DNS Usage Statistics Changing DNS Log File LocationTo 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 Setting Up MX Records Common Network Administration Tasks That Use DNS ServiceExample.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 RobinHosting Several Internet Services With a Single IP Address Configuring Bind Using the Command LineWhat Is BIND? Bind Configuration File Bind on Mac OS X ServerPractical Example Zone Data FilesTo 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 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 Rule Mechanism and Precedence Using Address RangesMultiple 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 changesCreating an Address Group To open the firewall for standard servicesTo 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 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 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 Starting and Stopping NAT Service 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 ProtocolTo enable L2TP Enabling and Configuring Pptp Transport ProtocolTo 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 WorksSetting Up NTP Service Using NTP on Your NetworkTo 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 Addressing Model IPv6 Reserved AddressesIPv6 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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