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Cobalt Digital Inc CacheRaQ 4 User Manual

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  • Page 1 COBALT CacheRaQ 4 User Manual...
  • Page 2 For a complete listing of the software used within the Cobalt CacheRaQ 4, and the terms under which it can be distributed, refer to the Cobalt Web site at http://www.cobalt.com.

  • Page 3: Important Safeguards

    2. Ventilation The CacheRaQ 4’s vents (on the front) and the fan opening(s) (on the back panel) are provided for ventilation and reliable operation of the product and to protect it from overheating. These openings must not be blocked or covered.
  • Page 4 Incorrect reassembly can cause electric shock when this product is subsequently used. 6. Operating the unit in an equipment rack If you plan to operate the CacheRaQ 4 in an equipment rack, take the following precautions: Ensure the ambient temperature around the CacheRaQ 4 (which may be higher than the room temperature) is within the limits specified in...
  • Page 5 A browser program failure, although annoying, does not adversely affect your CacheRaQ 4’s data. The CacheRaQ 4 has been tested with both Netscape Navigator version 4.7 and Microsoft Internet Explorer version 5.0.
  • Page 6 Cobalt CacheRaQ 4 User Manual...

  • Page 7: Preface

    CacheRaQ 4’s features, explains how to contact Cobalt Networks and provides general information about Cobalt networks. Chapter 2 — “Setting up the CacheRaQ 4” on page 11 explains how to set up the CacheRaQ 4 and integrate the server into the network.
  • Page 8 Preface viii Cobalt CacheRaQ 4 User Manual...

  • Page 9: Table Of Contents

    Regulations and information Preface Table of Contents 1 Introduction General Front view of the CacheRaQ 4 Rear view of the CacheRaQ 4 CacheRaQ 4 requirements Target audience for the user manual Cobalt Developer Network How to use this user manual...

  • Page 10: Table Of Contents

    Using the LCD console to configure the network Configuring the network settings Phase 2: Setting up with the Web browser Active Assist — Online Help Configuring the CacheRaQ 4 with the Setup Wizard 1. Cache setup Cache Mode table Cache Settings table Cache Proxy Settings table 2.
  • Page 11 Installing a package file A Using the LCD Console Set up network Reboot Power down Reset network Resetting the CacheRaQ 4 Administrator password B Product Specifications Caching features Performance System Management Browser-based user interface Reporting and logging of performance and usage...
  • Page 12 CacheRaQ 4 for workgroups Installation notes Advantage Deployment in an ISP Installation notes Advantage Disadvantage Cluster deployment in an ISP Installation notes Advantages Disadvantage Cluster deployment with an L4 switch in an ISP Installation notes Advantages Disadvantage Cobalt CacheRaQ 4 User Manual...
  • Page 13 Enterprise cluster with an L4 switch Installation notes Advantages Disadvantage D Advanced Information Serial console port Initializing the CacheRaQ 4 through the serial console port E Licenses THE BSD COPYRIGHT GNU GENERAL PUBLIC LICENSE SSL LICENSE F Glossary Cobalt CacheRaQ 4 User Manual...
  • Page 14 Table of Contents Cobalt CacheRaQ 4 User Manual...

  • Page 15: Introduction

    CacheRaQ 4. Either individual users or a central manager of the browser configuration files can configure the browser to do this. The CacheRaQ 4 also supports the use of a proxy auto-configuration (PAC) file for browser configuration.

  • Page 16: General

    Chapter 1: Introduction General Figure 1 and Figure 2 show the CacheRaQ 4 controls, indicators and connectors. Front view of the CacheRaQ 4 Figure 1. CacheRaQ 4 front view 1. The Status Indicators signal Ethernet and hard drive activity: Tx/Rx (Transmit/Receive) blinks when there is network traffic on the primary interface.

  • Page 17: Rear View Of The Cacheraq 4

    General Rear view of the CacheRaQ 4 Figure 2. CacheRaQ 4 rear view Cobalt Networks and Cobalt CacheRaQ are trademarks of Cobalt Networks, Inc. www.cobalt.com P/N 550-00192-01 100 - 240 VAC 50/60 Hz 1.4 A 60W max 1. The Security lock hole is used to lock the unit to a secure location.

  • Page 18: Cacheraq 4 Requirements

    A personal computer (attached to the network) that uses a Web browser (for example, Netscape Navigator, versions 4.7 or later, or Microsoft Internet Explorer, version 5.0 or later). To manage the CacheRaQ 4 from the user interface (UI), your browser must have Java and Javascript™ enabled.

  • Page 19: How To Use This User Manual

    Organization of the user manual The user manual is organized according to the user interface (UI). See Figure 3. For a list of chapters and appendices, see “Preface” on page vii. Figure 3. CacheRaQ 4 user interface Cobalt CacheRaQ 4 User Manual...

  • Page 20: Customer Service And Technical Support

    In Japan, send email to info-japan@cobalt.com. Cobalt Technical Support and Service Email contact You can contact Cobalt Networks Technical Support by email using the Online Email Support Form. This form provides us all the information we need to service your request in a timely fashion.

  • Page 21: Further Information

    Networks’ web site at http://www.cobalt.com/support/. Education For those who desire a premium level of technical expertise with Cobalt Networks products, we offer a number of training courses. The intended audience includes end users, Cobalt resellers, system and network administrators, systems engineers, product developers, support technicians, consultants and trainers.

  • Page 22: Before Contacting Technical Support

    To speed up your support call When contacting Cobalt Networks Technical Support, the more information you can provide, the better. Before you call or email, have the following information ready.

  • Page 23: Cobalt Logo Badge

    Cobalt logo badge Cobalt logo badge For more information on the CacheRaQ 4 server, click on the Cobalt Networks logo badge in the top left corner. • the amount of RAM • the size of the hard disk • the version of the Cobalt OS •...
  • Page 24 Chapter 1: Introduction Cobalt CacheRaQ 4 User Manual...

  • Page 25: Setting Up The Cacheraq 4

    (the Network 1 interface is always used). Use the Network 2 interface if you want to force your clients’ traffic to flow through the CacheRaQ 4. This mode is useful if, for example, you want to be able to filter or log all of your clients’ HTTP traffic.

  • Page 26: Phase 1: Making The Connection

    “Operating the unit in an equipment rack,” on page ii. If you plan to use the CacheRaQ 4 on a flat surface, attach the rubber feet to the five indentations on the bottom of the case. See Figure 4.

  • Page 27: Connecting To The Network

    If you plan to operate the CacheRaQ 4 in an equipment rack, first connect the mounting ears to the sides of the CacheRaQ 4 (see Figure 5), near either the front or the rear of the case. Attach the ears to the equipment rack.

  • Page 28: Connecting The Power Supply

    Chapter 2: Setting up the CacheRaQ 4 Connecting the power supply Connect the power supply cord to the CacheRaQ 4 and to an electrical outlet (100-240 volts AC, 50/60 Hz, as listed in Appendix B, “Product Specifications”). Powering on the CacheRaQ 4 Turn on the power by pressing the On/Off switch on the back panel.

  • Page 29: Using The Lcd Console To Configure The Network

    Figure 7 shows the LCD console for the CacheRaQ 4. The LCD screen on the front of the CacheRaQ 4 displays two lines of text. The top line of the LCD presents instructions on data to enter; the bottom line displays the data already entered.
  • Page 30 PRIMARY IP ADDR: 000.000.000.000 enter the IP address assigned to the primary network interface (Network 1) of the CacheRaQ 4 using the arrow buttons on the LCD console. 2. Press If the IP address is valid, the next prompt appears: PRIMARY NETMASK: 255.000.000.000...

  • Page 31: Phase 2: Setting Up With The Web Browser

    1. Launch a standard Web browser on any computer connected to the network. 2. Enable JavaScript in your browser if you normally disable it. 3. Enter the IP address of the CacheRaQ 4 (shown on the LCD screen on the front panel) into the URL field of your browser — for example: 4.

  • Page 32: Active Assist - Online Help

    Chapter 2: Setting up the CacheRaQ 4 If the CacheRaQ 4’s network settings were configured successfully, then the Cobalt Welcome screen appears; see Figure 8. Click the Start button to begin using the Setup Wizard. A second browser window opens to the Setup Wizard.

  • Page 33: Configuring The Cacheraq 4 With The Setup Wizard

    All of the Setup Wizard configuration options can be accessed from the CacheRaQ 4’s normal Web interface, so you can change or view the settings after finishing the Setup Wizard. The Setup Wizard presents the following four steps, each with its individual screen: Cache Setup, Network Setup, Administrator Setup, and Time and Time Zone Setup.

  • Page 34: Cache Setup

    Chapter 2: Setting up the CacheRaQ 4 1. Cache setup The Cache Setup screen allows you to configure the CacheRaQ 4’s caching software. This screen has three tables: Cache Mode, Cache Settings and Cache Proxy Settings. See Figure 9. Figure 9. Cache Setup screen...

  • Page 35: Cache Mode Table

    The value in this field determines how often the CacheRaQ 4’s caching software refreshes cached Web pages. A refresh occurs when the caching software decides...

  • Page 36: Cache Proxy Settings Table

    (for example, multimedia files) can often be cached at this setting. Disk Space for Log Files This setting controls the amount of disk space (in MB) on the CacheRaQ 4 that is devoted to storing log files. One log file is generated each day and is used to generate the information in the Cache Statistics section of the UI.
  • Page 37 You can specify the refresh rate in minutes, hours or days. This value specifies the period after which the CacheRaQ 4 re-examines the PAC file. If you enter “0” in this field, the CacheRaQ 4 retrieves the PAC file only when it is booted.

  • Page 38: Network Setup

    Chapter 2: Setting up the CacheRaQ 4 2. Network setup The Network Setup screen allows you to configure network-related settings that are not configured through the LCD console. See Figure 10. Figure 10. Network Setup screen Cobalt CacheRaQ 4 User Manual...

  • Page 39: Network Settings

    If they are not, the CacheRaQ 4 will not be available on the network. You must enter the host name and domain name of the CacheRaQ 4 and the IP address for the primary DNS server. If you are not the network administrator, you can obtain the correct values for these fields from your network...

  • Page 40: Administrator Setup

    The Administrator Setup screen lets you enter the administrator password, enter a full name for the admin user and specify an email address that the CacheRaQ 4 can use to notify the Administrator of any problems that might arise.

  • Page 41: Password Guidelines

    If you forget or want to reset the admin password, see “Resetting the Admin Password” in Appendix A. Advanced administration is possible by logging in to the CacheRaQ 4 through a telnet session. Log in as user root with the password you assigned to admin on this setup page.

  • Page 42: Time Setup

    Chapter 2: Setting up the CacheRaQ 4 4. Time setup The Time Setup screen appears. On this screen, you enter time and time zone information. It is important to enter the correct values here to ensure that the nightly log-file rotation and statistics programs run at the correct times. See Figure 12.

  • Page 43: Registration

    Phase 2: Setting up with the Web browser 5. Registration The Product Registration screen appears; see Figure 13. If you are connected to the Internet, you can register the CacheRaQ 4 by completing the online registration. ✍ Note: If you are not yet connected to the Internet, you cannot register online.
  • Page 44 DNS server, you can register your CacheRaQ 4 through email using the online registration form displayed in the Setup Wizard. If not, use the printed registration card that came in the CacheRaQ 4 box. It is recommended that you register your CacheRaQ 4 so that you can be notified of software updates (including patches for bug fixes), new product information,...

  • Page 45: Cacheraq 4 Administration

    Chapter 3 CacheRaQ 4 Administration This chapter describes the Cobalt CacheRaQ 4’s administrative functions, which are available through the Web interface. This interface includes the following items: • Home • Network setup • Cache setup • Filter setup • Report setup •...

  • Page 46: Home

    The Home button takes you to a default home page that describes the CacheRaQ 4. See Figure 14. Figure 14. CacheRaQ 4 home page Network setup The Network Setup screen (see Figure 15) is the same as described in the Setup Wizard.

  • Page 47: Cache Setup

    Delete All Stats Now This option removes all log files and statistics files stored on the CacheRaQ 4. Cobalt CacheRaQ 4 User Manual...

  • Page 48: Cache Cluster Settings

    To access the Cache Cluster Master Settings, click Cluster at the top. The Cache Cluster Master Settings table appears. See Figure 17. This option lets you configure the CacheRaQ 4 as a Cluster Master. To do this, you simply enter the host names (or IP addresses) of Cluster Slaves in the fields marked “Cluster Slave 1”, “Cluster Slave 2”...
  • Page 49 Caching mode or Transparent mode with one or two network interfaces. In Transparent Caching mode, all client traffic should be routed through the Cluster Master, just as if the Cluster Master were a standalone CacheRaQ 4 operating in Transparent mode.

  • Page 50: Inter-Cache Communication Protocol (Icp) Settings

    Chapter 3: CacheRaQ 4 Administration Inter-Cache Communication Protocol (ICP) settings To access the ICP Settings, click ICP at the top. The Peer Settings table appears; see Figure 18. Figure 18. ICP configuration screen ICP is an Internet protocol used to create cache hierarchies. A cache hierarchy is...
  • Page 51 Child Child In addition to the parent-child relationships, the CacheRaQ 4 supports the notion of siblings. Siblings are cache servers at the same level in the hierarchy, provided to distribute cache server load. Each cache in the hierarchy independently decides whether to fetch the reference from the object’s home site or from parent or...

  • Page 52: Proxy-Only And No-Query Options

    If the “proxy-only” option is enabled and the CacheRaQ 4 receives an object from elsewhere, the CacheRaQ 4 passes the object to the client but does not keep a copy in its cache. If the “proxy-only” option is not enabled, the CacheRaQ 4 caches the object that it receives.

  • Page 53: Web Cache Communication Protocol V1 (Wccp)

    (usually a piece of equipment from Cisco Systems®) and to be integrated into a WCCP-enabled network. ✍ Note: The CacheRaQ 4 only supports version 1 (v1) of the Web Cache Communication Protocol. With WCCP v1, a single router services a cluster; this router is the device that redirects all IP packets.

  • Page 54: Disable Caching

    Note: The Disable Caching feature is available only when clients are using the CacheRaQ 4 in Transparent Caching mode. Occasionally, CacheRaQ 4 users may have trouble accessing certain Web sites through the cache. This is often due to authentication schemes in which the server-side software authenticates users based on the IP address from which the user connects to the server.
  • Page 55 HTTP traffic that is destined for the specified host or network. When you are finished, click Save Changes. The table reappears with the new entry. Figure 21. Add Entry screen for Disable Caching feature Cobalt CacheRaQ 4 User Manual...

  • Page 56: Filter Setup

    Chapter 3: CacheRaQ 4 Administration Filter setup The CacheRaQ 4 is capable of filtering HTTP traffic that passes through it. The Filter Setup screen allows you to choose among three options. See Figure 22. • No Filtering. The CacheRaQ 4 allows all HTTP traffic. This is the default option.

  • Page 57: Report Setup

    Cobalt CacheRaQ 4 User Manual...

  • Page 58: Threshold Settings

    You can set four thresholds for generating reports: bytes per client, documents per client, bytes per server and documents per server. In each of these fields, enter a value beyond which the CacheRaQ 4 generates a report. To list all clients or servers (or both) in a report, enter “0” in these fields.

  • Page 59: Cache Statistics

    Cache statistics Cache statistics The CacheRaQ 4’s caching software records information on all HTTP requests it receives. Statistics are calculated nightly from this data and are available on a daily basis for the current month and the preceding month. To use the Cache Statistics page, you first set the parameters for the statistics you want to view and then you generate the statistics.
  • Page 60 Average cache hit latency. This is the average amount of time (in seconds) it took the CacheRaQ 4 to deliver a document from its cache to a client. The time measured is the difference between the time that the CacheRaQ 4 receives the request initially to the time that the CacheRaQ 4 has finished...

  • Page 61: Usage Statistics

    file. Cache logs The CacheRaQ 4’s caching software logs data to two files in its normal course of operation—access.log and cache.log. • Access.log contains one line per request served. Among other things, each line lists the URL of the requested document, the client’s IP address, the size...

  • Page 62: Network Usage

    Network usage The Network Usage screen shows statistics for network packets sent and received on the CacheRaQ 4’s two network interfaces; see Figure 24. If an interface is not used, the statistics are displayed as “0” for that interface. Packets are counted in the following categories: •...

  • Page 63: Cpu Usage

    Figure 24. Network Usage screen CPU usage This screen displays a graph of the CacheRaQ 4’s load average as it varies over time. The load average is a rough indicator of overall system activity. Generally, a high load average indicates a busy system. A CacheRaQ 4 with a load average that routinely exceeds 1.0 may be overloaded—a Cache Cluster might be...

  • Page 64: Maintenance

    (see “Password guidelines” on page 27) (optional) an email address to which the CacheRaQ 4 sends email if it detects problems that require administrative intervention. Email Reports, if configured, are also sent to this address.

  • Page 65: Time Setup

    Maintenance Time Setup This screen lets you set the time and time zone on the CacheRaQ 4. It is important to set the time correctly, because the CacheRaQ 4 software rotates the log files and generates the statistics shortly after midnight each day. This time is chosen because it is close to the start of the day.

  • Page 66: Upgrade Software

    Loaded: option. /home/packages To do so, the admin must first telnet in to the CacheRaQ 4 and then FTP out to get the package file. By default, you cannot FTP in to the CacheRaQ 4.
  • Page 67 Maintenance Once the package is installed, the system may prompt you through the UI to reboot the CacheRaQ 4. Some packages require you to reboot the system for the new software package to take effect. Cobalt recommends that you reboot the server now. You can choose not to reboot, but the new software will not come into effect and it may stop some processes from running.
  • Page 68 Chapter 3: CacheRaQ 4 Administration Cobalt CacheRaQ 4 User Manual...

  • Page 69: A Using The Lcd Console

    • reboot, which restarts the entire CacheRaQ 4 • power down in a way that allows the CacheRaQ 4 to close all open files, and minimizes startup time the next time the CacheRaQ 4 is powered on • reset the network, which resets all IP addresses, netmasks and other network settings to that of a new, unconfigured system...

  • Page 70: Set Up Network

    9. Use the arrow buttons to toggle the cursor between [S]ave and [C]ancel. If you select Save, the CacheRaQ 4 reboots using the new network configuration. If you select Cancel, you return to step 1 of this procedure. 10. Press the button.

  • Page 71: Reboot

    Reboot Reboot To reboot the CacheRaQ 4: 1. On the LCD console, hold down the button for approximately two seconds. The LCD screen displays: SELECT: SETUP NETWORK 2. Press the button until Reboot appears in the LCD screen: SELECT: REBOOT 3.

  • Page 72: Power Down

    Caution: To prevent the potential loss of data, it is important to follow the proper power-down procedure before turning off the CacheRaQ 4. To power down the CacheRaQ 4: 1. On the LCD console, hold down the button for approximately two seconds.

  • Page 73: Reset Network

    The Reset Network function resets the host name, IP address, subnet mask, gateway and DNS information to that of a new, unconfigured system. This function is useful if you are moving the CacheRaQ 4 to a new network. To reset the CacheRaQ 4 to a factory-fresh state: 1.

  • Page 74: Resetting The Cacheraq 4 Administrator Password

    Administrator password IMPORTANT: After you clear the password, enter a new one as soon as possible to protect the security of the CacheRaQ 4. At this point, anyone on the network can assign the CacheRaQ 4 Administrator password until you assign a new one.

  • Page 75: B Product Specifications

    • Supports 200 simultaneous requests • Scalability through Cobalt InstaCache Clustering • Built-in support for Level 4 switching for scalability and failover protection • Stores meta-data and hot objects in RAM for fast cache lookups Cobalt CacheRaQ 4 User Manual...

  • Page 76: System Management

    Cache configuration settings • User-definable parameters for refreshing cached documents • User-definable maximum size for a cacheable object Miscellaneous • Automatic system restart (after power outage and restore) • Browser-based utility for software upgrades • Year-2000 compliant Cobalt CacheRaQ 4 User Manual...

  • Page 77: Hardware

    Hardware Hardware The CacheRaQ 4 has the following hardware components. • x86-compatible superscalar processor • 64-MB to 512-MB PC-100 SDRAM DIMMs (2 slots) (3.3 v, 168-pin, non-parity, unbuffered) • One internal Ultra ATA/33 hard drive • Two 10/100 BaseT ethernet network interfaces •...

  • Page 78: Physical Data

    Appendix B: Product Specifications Physical data The CacheRaQ 4 has the following physical characteristics. • Dimensions: 17.00 in. x 12.50 in. x 1.75 in. (43.2 cm x 31.8 cm x 4.5 cm; fits in a standard single-unit, 19-in. equipment rack) •...

  • Page 79: C Sample Network Topologies

    Appendix C Sample Network Topologies This appendix shows how the Cobalt CacheRaQ 4 can be used in a variety of ways in different network environments. It illustrates the connections among the network components and gives configuration details for each setup.

  • Page 80: Advantage

    4. Click the radio button for Automatic Proxy Configuration. 5. In the URL field, enter http://<cacheraq-name>/proxy.pac. Advantage • If the CacheRaQ 4 fails, the outside network is still accessible (contrast this with Transparent Caching mode discussed later). Disadvantage • You must change the browser configuration for each client.

  • Page 81: Transparent Caching Mode Using One Network Interface

    The client machines do not require a special configuration. Disadvantage • If the CacheRaQ 4 fails, the clients cannot access the outside network until the CacheRaQ 4 comes back online. However, if the clients can be configured with multiple gateway addresses, you can configure them with the new IP address for the router/firewall.

  • Page 82: Transparent Caching Mode Using Two Network Interfaces

    IP address) and the CacheRaQ 4’s Network 1 interface. Ensure that the IP addresses you assign to the router and to Network 1 are on a subnet different from the clients’ network. This is necessary for the CacheRaQ 4 to pass traffic through from the clients to the router.

  • Page 83: Cacheraq 4 For Workgroups

    CacheRaQ 4 for workgroups Installation notes • You can configure the CacheRaQ 4 for either Traditional Proxy Caching mode or Transparent Caching mode (using one or two network interfaces). • To set up the mode you choose, follow the instructions given in “Traditional Proxy Caching mode”...

  • Page 84: Deployment In An Isp

    Enter the IP address of the router as the gateway for the CacheRaQ 4. • One CacheRaQ 4 should be able to handle 1 Mb/s to 2 Mb/s of wide area network (WAN) traffic. Contact Cobalt Networks, Inc. for more detailed deployment guidelines.

  • Page 85: Cluster Deployment In An Isp

    Cluster deployment in an ISP Cluster deployment in an ISP Installation notes • Configure one CacheRaQ 4 as the Cluster Master (see “Cache Cluster settings” on page 34). • Configure the Cluster Master to operate in Transparent Caching mode using one network interface.

  • Page 86: Cluster Deployment With An L4 Switch In An Isp

    You do not need a Cluster Master. • This solution is scalable—you can have dozens of CacheRaQ 4s for each L4 switch. • This is the fastest, largest-capacity solution. Disadvantage • An L4 switch is expensive. Cobalt CacheRaQ 4 User Manual...

  • Page 87: Cluster In Traditional Proxy Caching Mode

    Cluster in Traditional Proxy Caching mode Cluster in Traditional Proxy Caching mode Installation notes • Configure one CacheRaQ 4 as the Cluster Master (see “Cache Cluster settings” on page 34). • The Cluster Slaves require no special configuration. Advantages •...

  • Page 88: Cluster In Transparent Caching Mode

    Advantage • You do not need to change the browser configuration of the clients. Disadvantage • If the Cluster Master fails, the clients cannot access the outside network until the Cluster Master comes back online. Cobalt CacheRaQ 4 User Manual...

  • Page 89: Enterprise Cluster With An L4 Switch

    It is fully scalable—you can add CacheRaQ 4s as needed. An L4 switch typically places few limits on the maximum number of cache servers. • It provides increased cache storage space. • You do not need a Cluster Master. Disadvantage • An L4 switch is expensive. Cobalt CacheRaQ 4 User Manual...
  • Page 90 Appendix C: Sample Network Topologies Cobalt CacheRaQ 4 User Manual...

  • Page 91: Serial Console Port

    Serial console port You can connect a console terminal to the DB-9 connector on the back panel of the CacheRaQ 4. The terminal can be either an ASCII terminal or a PC running terminal software. The console terminal should have the following communications parameters—115 200 baud, 8 data bits, no parity and one stop...
  • Page 92 • 1 stop bit 3. Power on the CacheRaQ 4 with the power switch on the back panel. 4. A number of boot messages are displayed on your terminal screen. 5. The first prompt asks for an IP address. Enter the Primary IP Address for the CacheRaQ 4 (for example, 10.9.19.55).

  • Page 93: E Licenses

    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Cobalt CacheRaQ 4 User Manual...

  • Page 94: Gnu General Public License

    Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. Cobalt CacheRaQ 4 User Manual...
  • Page 95 In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. Cobalt CacheRaQ 4 User Manual...
  • Page 96 Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated, so long as such parties remain in full compliance. Cobalt CacheRaQ 4 User Manual...
  • Page 97 This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. Cobalt CacheRaQ 4 User Manual...
  • Page 98 Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. Cobalt CacheRaQ 4 User Manual...
  • Page 99 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Cobalt CacheRaQ 4 User Manual...

  • Page 100: Ssl License

    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Cobalt CacheRaQ 4 User Manual...

  • Page 101: F Glossary

    See also Encryption and Secure Sockets Layer (SSL). Carrier sense In a local area network (LAN), an ongoing activity of a data station to detect whether another station is transmitting. Cobalt CacheRaQ 4 User Manual...
  • Page 102 Each device then waits a random amount of time and retries until successful in getting the transmission sent. CSMA/CD See carrier sense multiple access with collision detection (CSMA/CD). DHCP See Dynamic Host Configuration Protocol (DHCP). See Domain Name System (DNS). Cobalt CacheRaQ 4 User Manual...
  • Page 103 Using FTP, you can update — delete, rename, move and copy — files at a server. You need to log on to an FTP server. However, publicly available files are easily accessed using anonymous FTP. Cobalt CacheRaQ 4 User Manual...
  • Page 104 Fast Ethernet. Physical variations of the original IEEE 802.3 specification include 10Base2, 10Base5, 10BaseF, 10BaseT and 10Broad36. Physical variations for Fast Ethernet include 100BaseT, 100BaseT4 and 100BaseX. IMAP See Internet Message Access Protocol (IMAP). See Inter-Cache Communication Protocol. Cobalt CacheRaQ 4 User Manual...
  • Page 105 Internet. You send email with SMTP and a mail handler receives it on your recipient’s behalf. Then the mail is read using POP or IMAP. See also “Post Office Protocol 3 (POP3)” on page 95 and “Simple Mail Transfer Protocol (SMTP)” on page 97. Cobalt CacheRaQ 4 User Manual...
  • Page 106 LAN standards specify cabling and signaling at the physical and data link layers of the Open Systems Interconnection (OSI) model. Widely used LAN technologies include ethernet, fiber distributed data interface (FDDI) and token ring. See also wide area network (WAN). Cobalt CacheRaQ 4 User Manual...
  • Page 107 A mechanism for reducing the need for globally unique IP addresses. NAT allows an organization with addresses that are not globally unique to connect to the Internet by translating those addresses into globally routable address space. Also known as Network Address Translator. Cobalt CacheRaQ 4 User Manual...
  • Page 108 Burst data can be sent starting with an address on the first cycle and a sequence of data transmissions on a certain number of successive cycles. POP3 See Post Office Protocol (POP3). Cobalt CacheRaQ 4 User Manual...
  • Page 109 On the Internet, the root name server system is the manner in which an authoritative master list of all top-level domain names (such as .com, .net, .org and individual country codes) is maintained and made available. SCSI See Small Computer System Interface (SCSI). Cobalt CacheRaQ 4 User Manual...
  • Page 110 In addition, all data sent over an encrypted SSL connection is protected with a mechanism for detecting tampering — that is, for automatically determining whether the data has been altered in transit. See also Authentication and Encryption. Cobalt CacheRaQ 4 User Manual...
  • Page 111 SCSI port, so that SCSI is really an input/output bus rather than simply an interface. Although SCSI is an ANSI standard, there are many variations, so two SCSI interfaces can be incompatible. For example, SCSI supports several types of connectors. See Server Message Block (SMB). Cobalt CacheRaQ 4 User Manual...
  • Page 112 A common name for the suite of protocols developed in the 1970s to support the construction of worldwide internetworks. TCP and IP are the two best-known protocols in the suite. The TCP/IP protocols enable computers and networks to connect to an intranet or Internet. Cobalt CacheRaQ 4 User Manual...
  • Page 113 A data communications network that serves users across a broad geographic area and often uses transmission devices provided by common carriers. Asynchronous transfer mode (ATM), frame relay, Switched Multimegabit Data Service (SMDS) and X.25 are examples of WANs. See also local area network (LAN). Cobalt CacheRaQ 4 User Manual...
  • Page 114 Appendix F: Glossary Cobalt CacheRaQ 4 User Manual...

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