1000BASE-LX: A long wavelength for a “long haul” fiber optic cable for a maximum length of 10 kilometers.

100BASE-FX: 100Mbps Ethernet implementation over fiber.

100BASE-TX: 100Mbps Ethernet implementation over Category 5 and Type 1 Twisted Pair cabling.

10BASE-T: The IEEE 802.3 specification for Ethernet over Unshielded Twisted Pair (UTP) cabling.

aging: The automatic removal of dynamic entries from the Switch Database which have timed-out and are no longer valid.

ATM: Asynchronous Transfer Mode. A connection oriented transmission protocol based on fixed length cells (packets). ATM is designed to carry a complete range of user traffic, including voice, data and video signals.

auto-negotiation: A feature on a port which allows it to advertise its capabilities for speed, duplex and flow control. When connected to an end station that also supports auto-negotiation, the link can self-detect its optimum operating setup.

backbone port: A port which does not learn device addresses, and which receives all frames with an unknown address. Backbone ports are normally used to connect the Switch to the backbone of your network. Note that backbone ports were formerly known as designated downlink ports.

backbone: The part of a network used as the primary path for transporting traffic between network segments.

bandwidth: Information capacity, measured in bits per second that a channel can transmit. The bandwidth of Ethernet is 10Mbps, the bandwidth of Fast Ethernet is 100Mbps.

baud rate: The switching speed of a line. Also known as line speed between network segments.

BOOTP: The BOOTP protocol allows automatic mapping of an IP address to a given MAC address each time a device is started. In addition, the protocol can assign the subnet mask and default gateway to a device.

bridge: A device that interconnects local or remote networks no matter what higher level protocols are involved. Bridges form a single logical network, centralizing network administration.

broadcast: A message sent to all destination devices on the network.

broadcast storm: Multiple simultaneous broadcasts that typically absorb available network bandwidth and can cause network failure.

console port: The port on the Switch accepting a terminal or modem connector. It changes the parallel arrangement of data within computers to the serial form used on data transmission links. This port is most often used for dedicated local management.

CSMA/CD: Channel access method used by Ethernet and IEEE 802.3 standards in which devices transmit only after finding the data channel clear for some period of time. When two devices transmit simultaneously, a collision occurs and the colliding devices delay their retransmissions for a random amount of time.

data center switching: The point of aggregation within a corporate network where a switch provides high-performance access to server farms, a high-speed backbone connection and a control point for network management and security.

Ethernet: A LAN specification developed jointly by Xerox, Intel and Digital Equipment Corporation. Ethernet networks operate at 10Mbps using CSMA/CD to run over cabling.

Fast Ethernet: 100Mbps technology based on the CSMA/CD network access method.

Flow Control: (IEEE 802.3X) A means of holding packets back at the transmit port of the connected end station. Prevents packet loss at a congested switch port.

forwarding: The process of sending a packet toward its destination by an internetworking device.

full duplex: A system that allows packets to be transmitted and received at the same time and, in effect, doubles the potential throughput of a link.

half duplex: A system that allows packets to be transmitted and received, but not at the same time. Contrast with full duplex.

IP address: Internet Protocol address. A unique identifier for a device attached to a network using TCP/IP. The address is written as four octets separated with full-stops (periods), and is made up of a network section, an optional subnet section and a host section.

IPX: Internetwork Packet Exchange. A protocol allowing communication in a NetWare network.

LAN – Local Area Network: A network of connected computing resources (such as PCs, printers, servers) covering a relatively small geographic area (usually not larger than a floor or building). Characterized by high data rates and low error rates.

Client-based IPsec VPN connections often do not work when passing through a NAT device as the IKE and IPsec protocols were not designed to work through NAT. NAT Traversal is an add-on to the IKE and IPsec protocols that allows them to work when being NATed.

NAT traversal is only used if both endpoints support it. D-Link products that currently support NAT traversal include the D-Link DFL-200, DFL-700 and DFL-1100.

Note: The DFL-800 and DFL-300 does not support NAT traversal.

Due to the fact that you have attempted to install the drivers for the wireless adapter, the device manager might be holding multiple copies of the drivers which might be preventing the drivers from being loaded properly. In order to address the problem, please do the following:

Step 1: If the computer has a built-in ethernet adapter, please make sure that you disable it.

Step 2: Boot into safe mode (press F8 during bootup). Once in safe mode, access the device manager (right-click my computer, left-click properties, left-click on the hardware tab, left-click on device manager). Expand the network adapters category and determine if there are multiple copies of the driver. If so, please uninstall them one by one until they are removed completely.

Step 3: Go to Control Panel, Add/Remove programs, and uninstall the D_Link configuration utility.

Step 4: At this point, restart the laptop and eject the wireless card. If you have a PCI adapter, do not reboot or remove the adapter.

Step 5 Make sure that there are no background utilities running such as antivirus, crash guard, or firewall. If so, please disable them.

Step 6: Run the installation CD in order to install the drivers for the wireless adapter.

Step 7: If you have a laptop, shutdown the computer and install the adapter. Turn on computer and Windows should install the drivers.

If you have a PCI adapter, reboot the computer and Windows should install the drivers.

No wireless signal

Move the antennas of the access point or wireless router into an L shape (one vertically, and one horizontally). The click on the Refresh button on the Site Survey screen. If the computer still does not see the Access Point. Then try moving your Access Point closer to the Computer. Then click on the Refresh button again. If the computer does not see the Access Point still, then try moving the computer so it is not flush with the wall. Move all things that may cause interference with the wireless signal.

Open the D-Link Wireless Utility, and select Site Survey. Select the Wireless Network you wish to connect to and then select the Connect button.

If you still cannot get a wireless connection power cycle the network.
1- Turn the Computer off
2- Turn the Access Point off
3- Turn the Access Point on
4- Wait 30 seconds
5- Turn Computer back on

Using the AirPlus utility reconnect to the Access Point:
1- Double click on the bar graph icon in the system tray
2- Select the Site Survey Link
3- Highlight the SSID of your wireless network and click connect
4- Click OK if all the settings are correct

If My network is not showing in Site Survey?
1- Double click on the bar graph in the system tray
2- Select the Configuration link
3- Type in the SSID and all other values that are on the Access Point
4- Click Apply

Using the Windows XP built in Zero Configuration (2.20 drivers)
1- Right click on the two computer monitor icons in the system tray
2- Highlight the SSID of you wireless network in the Available Networks box
3- Click connect

Step 1: Open the Control Panel on your PC. Select Network Connections.

Using Category view:

You will then need to select Network Connections if you are using Cagegory view:

Step 2: Right click the adapter and select Properties.

• For Ethernet (hardwired) adapters, use the item listed as Ethernet Adapter Local Area Connection.
• For Wireless adapters, use the item listed as Ethernet Adapter Wireless Area Connection.

Step 3: Scroll down the list of items and select Internet Protocol (TCP/IP), then click Properties.

Step 4: Select the radio button labeled Obtain an IP address automatically.

Step 5: Click OK on the Internet Protocol properties window to save settings.

Step 6: Click OK on the adapter´s properties window to save settings.

Your adapter is now set to obtain its IP address using DHCP. You may have to right-click the adapter and select Repair to request the new IP using DHCP.

D-Link DGS Serise Switch, Many models have Gigabit Ethernet Combo port,For More Please visit www.dlink.cc

Note: If a Mini-GBIC port is being used, then the corresponding 1000BASE-T copper port is automatically disabled and vice versa.

Bandwidth Control is a feature that allows the Network Administrator to specify the allowed rate of incoming and outgoing traffic on a per port basis. All D-Link switches that support Bandwidth Control will allow you to limit the Tx and Rx rates to a minimum value (see the manual for the minimum granularity value for your switch).

In these cases, you can use Inbound Filters to limit that exposure by specifying the IP addresses of internet hosts that you trust to access your LAN through the ports that you have opened. You might, for example, only allow access to a game server on your home LAN from the computers of friends whom you have invited to play the games on that server.

Inbound Filters can be used for limiting access to a server on your network to a system or group of systems. Filter rules can be used with Virtual Server, Gaming, or Remote Administration features. Each filter can be used for several functions; for example a “Game Clan” filter might allow all of the members of a particular gaming group to play several different games for which gaming entries have been created. At the same time an “Admin” filter might only allows systems from your office network to access the WAN admin pages and an FTP server you use at home. If you add an IP address to a filter, the change is effected in all of the places where the filter is used.

Add/Edit Inbound Filter Rule

Here you can add entries to the Inbound Filter Rules List below, or edit existing entries.

Name

Enter a name for the rule that is meaningful to you.

Action

The rule can either Allow or Deny messages.

Source IP Range

Define the ranges of Internet addresses this rule applies to. For a single IP address, enter the same address in both the Start and End boxes. Up to eight ranges can be entered. The Enable checkbox allows you to turn on or off specific entries in the list of ranges.

Save
Saves the new or edited Inbound Filter Rule in the following list. When finished updating the Inbound Filter Rules List, you must still click the Save Settings button at the top of the page to make the changes effective and permanent.

Inbound Filter Rules List

The section lists the current Inbound Filter Rules. An Inbound Filter Rule can be changed by clicking the Edit icon, or deleted by clicking the Delete icon. When you click the Edit icon, the item is highlighted, and the “Edit Inbound Filter Rule” section is activated for editing.

In addition to the filters listed here, two predefined filters are available wherever inbound filters can be applied:

Allow All

Permit any WAN user to access the related capability.

Deny All

Prevent all WAN users from accessing the related capability. (LAN users are not affected by Inbound Filter Rules.)

In Windows 95, the default MTU was 1500 octets (eight-bit bytes), partly because this is the Ethernet standard MTU. The Internet de facto standard MTU is 576, but ISPs often suggest using 1500. If you frequently access Web sites that encounter routers with an MTU size of 576, you may want to change to that size. (Apparently some users find that changing the setting to 576 improves performance and others do not find any improvement.) The minimum value that an MTU can be set to is 68.

For more recent Windows systems, the operating system is able to sense whether your connection should use 1500 or 576 and select the appropriate MTU for the connection.

The original design of the Domain Name System (DNS) did not include security; instead it was designed to be a scalable distributed system. The Domain Name System Security Extensions (DNSSEC) attempts to add security, while maintaining backwards compatibility. RFC 3833 attempts to document some of the known threats to the DNS and how DNSSEC responds to those threats.

DNSSEC was designed to protect Internet resolvers (clients) from forged DNS data, such as that created by DNS cache poisoning. All answers in DNSSEC are digitally signed. By checking the digital signature, a DNS resolver is able to check if the information is identical (correct and complete) to the information on the authoritative DNS server. While protecting IP addresses is the immediate concern for many users, DNSSEC can protect other information such as general-purpose cryptographic certificates stored in CERT records in the DNS. RFC 4398 describes how to distribute these certificates, including those for email, making it possible to use DNSSEC as a worldwide public key infrastructure for email.

What is the vulnerability in the DNS?

The efficient work of storing a response that functions as a mid-way point between an end user’s computer and an authoritative server is performed by a caching name server, usually operated by an ISP (Internet Service Provider). The DNS was designed to allow this caching server to accept the first response it receives. It is possible, without the verification provided by DNSSEC authentication, for a malicious user to flood this caching name server with a spoofed response that is, most often, intended to dupe the end user into providing personal and or financial information to what appears to be his or her intended destination.

How does DNSSEC work?

DNSSEC works through a system of keys. At each stage in supplying a DNS query response through the chain that takes it back to the initiator’s machine, a known key and a private key must be matched. In this way, the response to the query is authenticated and the response validated.

Ethernet networks are packet-based and have no concept of a connection or circuit and also lack basic security features to protect against IP and MAC conflicts and rogue DHCP servers. By using PPPoE, users can virtually “dial” from one machine to another over an Ethernet network, establish a point to point connection between them and then securely transport data packets over the connection. It is mainly used by telephone companies, since PPPoE is easily integrated with the current dial-up AAA systems and fits perfectly into the current ATM backbones. The protocol also permits very easy unbundling of DSLAMs where required by regulators, since the user would simply use a different login into PPP, then the ATM circuit would be routed to the user’s ISP. Also pre-paid traffic bucket business models can be created with PPPoE more easily than with DHCP or multiplexing multiple users with different speed tiers or QoS through 1 DSL modem or by creating a different login for each static IP purchased by customers.