Apple 034-2351_Cvr manual Monitoring Firewall Service, Viewing the Firewall Status Overview

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Monitoring Firewall Service

Firewalls are a networks first line of defense against malicious computer users (commonly called “hackers”). To maintain the security of your computers and users, you need to monitor firewall activity and deter potential threats. This sections explains how to log and monitor your firewall.

Viewing the Firewall Status Overview

The Status Overview shows a simple summary of the firewall service. It shows whether or not the service is running and which filters rules are active.

To see the overview:

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

2Click the Overview button.

Setting Up Logs for Firewall Service

You can log only the packets that are denied by the filters you set, only the packets that are allowed, or both. Both logging options can generate a lot of log entries, which can fill up disk space and degrade the performance of the server. You should use “Log all allowed packets” only for limited periods of time.

You can choose to log allowed packets, denied packets, and a designated number of packets.

To set up logs:

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

2Click Settings.

3Select the Logging tab.

4Select the logging options you want.

5Click Save to start logging.

Viewing the Firewall Log

Each filter you create in Server Admin corresponds to one or more rules in the underlying firewall software. Log entries show you the rule applied, the IP address of the client and server, and other information.

To view the log for firewall service:

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

2Click Settings.

3Select the Log tab.

Here are some examples of firewall log entries and how to read them.

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 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 ServiceSetting 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 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 master zone Adding a Slave ZoneTo add a slave 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 DNSViewing DNS Usage Statistics Changing DNS Log File LocationTo change the log detail level 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 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 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 NetworkHosting 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 ExampleTo 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 AddressCidr 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 toSave firewall service changes Managing Firewall ServiceStarting and Stopping Firewall Service Opening the Firewall for Standard ServicesCreating 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 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 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 PrecautionsCreating IP Filter Rules Reviewing IP Filter RulesDeleting IP Filter Rules Port ReferencePptp 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 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 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 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 ServiceSetting 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 AddressesIPv6 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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