SMC Networks Router SMCWBR14-N User Manual
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78 Status_Statistics The Statistics page displays all of the LAN, WAN, and Wireless packet transmit and receive statistics. Sent The number of packets sent from the router. Received The number of packets received by the router. TX Packets Dropped The number of packets that were dropped while being sent, due to errors, collisions, or router resource limitations. RX Packets Dropped The number of packets that were dropped while being received, due to errors, collisions, or router resource limitations. Collisions The number of packets that were dropped due to Ethernet collisions (two or more devices attempting to use an Ethernet circuit at the same time). Errors The number of transmission failures that cause loss of a packet. A noisy radio-frequency environment can cause a high error rate on the wireless LAN.
79 Status_Active Sessions The Active Sessions page displays full details of active sessions through your router. A session is a conversation between a progam or application on a LAN-side computer and a program or application on a WAN-side computer. Internal The IP address and port number of the LAN-side application. Protocol The communications protocol used for the conversation. External The IP address and port number of the WAN-side application. NAT The port number of the LAN-side application as viewed by the WAN-side application. Priority The preference given to outbound packets of this conversation by the StreamEngine logic. Smaller numbers represent higher priority. State State for sessions that use the TCP protocol. • NO: None -- This entry is used as a placeholder for a future connection that may occur.
80 • SS: SYN Sent -- One of the systems is attempting to start a connection. • EST: Established -- the connection is passing data. • FW: FIN Wait -- The client system has requested that the connection be stopped. • CW: Close Wait -- the server system has requested that the connection be stopped. • TW: Time Wait -- Waiting for a short time while a connection that was in FIN Wait is fully closed. • LA: Last ACK -- Waiting for a short time while a connection that was in Close Wait is fully closed. • CL: Closed -- The connection is no longer active but the session is being tracked in case there are any retransmitted packets still pending. Dir The direction of initiation of the conversation: Out Initiated from LAN to WAN. In Initiated from WAN to LAN. Time Out The number of seconds of idle time until the router considers the session terminated. The initial value of Time Out depends on the type and state of the connection. 300 seconds UDP connections. 20 seconds Reset or closed TCP connections. The connection does not close instantly so that lingering packets can pass or the connection can be re-established. 120 seconds Opening or closing TCP connections. 7800 seconds Established TCP connections. Status_WISH Sessions The WISH Sessions page displays full details of active local wireless sessions through your router when WISH has been enabled. A WISH session is a conversation between a program or application on a wirelessly connected LAN-side computer and another computer, however connected.
81 Originator The IP address and, where appropriate, port number of the computer that originated a network connection. Target The IP address and, where appropriate, port number of the computer to which a network connection has been made. Protocol The communications protocol used for the conversation. State State for sessions that use the TCP protocol. • NO: None -- This entry is used as a placeholder for a future connection that may occur. • SS: SYN Sent -- One of the systems is attempting to start a connection. • EST: Established -- the connection is passing data. • FW: FIN Wait -- The client system has requested that the connection be stopped. • CW: Close Wait -- the server system has requested that the connection be stopped. • TW: Time Wait -- Waiting for a short time while a connection that was in FIN Wait is fully closed. • LA: Last ACK -- Waiting for a short time while a connection that was in Close Wait is fully closed. • CL: Closed -- The connection is no longer active but the session is being tracked in case there are any retransmitted packets still pending.
82 Priority The priority given to packets sent wirelessly over this conversation by the WISH logic. The priorities are: • BK: Background (least urgent). • BE: Best Effort. • VI: Video. • VO: Voice (most urgent). Time Out The number of seconds of idle time until the router considers the session terminated. The initial value of Time Out depends on the type and state of the connection. 300 seconds UDP connections. 240 seconds Reset or closed TCP connections. The connection does not close instantly so that lingering packets can pass or the connection can be re-established. 7800 seconds Established or closing TCP connections. .
83 Glossary A Access Control List ACL. This is a database of network devices that are allowed to access resources on the network. Access Point AP. Device that allows wireless clients to connect to it and access the network ActiveX A Microsoft specification for the interaction of software components. Ad-hoc network Peer-to-Peer network between wireless clients Address Resolution Protocol ARP. Used to map MAC addresses to IP addresses so that conversions can be made in both directions. ADSL Asymmetric Digital Subscriber Line Advanced Encryption Standard AES. Government encryption standard Alphanumeric Characters A-Z and 0-9 Antenna Used to transmit and receive RF signals. AppleTalk A set of Local Area Network protocols developed by Apple for their computer systems AppleTalk Address Resolution Protocol AARP. Used to map the MAC addresses of Apple computers to their AppleTalk network addresses, so that conversions can be made in both directions. Application layer 7th Layer of the OSI model. Provides services to applications to ensure that they can communicate properly with other applications on a network. ASCII
84 American Standard Code for Information Interchange. This system of characters is most commonly used for text files Attenuation The loss in strength of digital and analog signals. The loss is greater when the signal is being transmitted over long distances. Authentication To provide credentials, like a Password, in order to verify that the person or device is really who they are claiming to be Automatic Private IP Addressing APIPA. An IP address that that a Windows computer will assign itself when it is configured to obtain an IP address automatically but no DHCP server is available on the network B Backward Compatible The ability for new devices to communicate and interact with older legacy devices to guarantee interoperability Bandwidth The maximum amount of bytes or bits per second that can be transmitted to and from a network device Basic Input/Output System BIOS. A program that the processor of a computer uses to startup the system once it is turned on Baud Data transmission speed Beacon A data frame by which one of the stations in a Wi-Fi network periodically broadcasts network control data to other wireless stations. Bit rate The amount of bits that pass in given amount of time Bit/sec Bits per second BOOTP Bootstrap Protocol. Allows for computers to be booted up and given an IP address with no user intervention Bottleneck
85 A time during processes when something causes the process to slowdown or stop all together Broadband A wide band of frequencies available for transmitting data Broadcast Transmitting data in all directions at once Browser A program that allows you to access resources on the web and provides them to you graphically C Cable modem A device that allows you to connect a computer up to a coaxial cable and receive Internet access from your Cable provider CardBus A newer version of the PC Card or PCMCIA interface. It supports a 32-bit data path, DMA, and consumes less voltage CAT 5 Category 5. Used for 10/100 Mbps or 1Gbps Ethernet connections Client A program or user that requests data from a server Collision When do two devices on the same Ethernet network try and transmit data at the exact same time. Cookie Information that is stored on the hard drive of your computer that holds your preferences to the site that gave your computer the cookie D Data Information that has been translated into binary so that it can be processed or moved to another device Data Encryption Standard Uses a randomly selected 56-bit key that must be known by both the sender and the receiver when information is exchanged Data-Link layer
86 The second layer of the OSI model. Controls the movement of data on the physical link of a network Database Organizes information so that it can be managed updated, as well as easily accessed by users or applications. DB-25 A 25 ping male connector for attaching External modems or RS-232 serial devices DB-9 A 9 pin connector for RS-232 connections dBd Decibels related to dipole antenna dBi Decibels relative to isotropic radiator dBm Decibels relative to one milliwatt Decrypt To unscramble an encrypted message back into plain text Default A predetermined value or setting that is used by a program when no user input has been entered for this value or setting Demilitarized zone DMZ: A single computer or group of computers that can be accessed by both users on the Internet as well as users on the Local Network, but that is not protected by the same security as the Local Network. DHCP Dynamic Host Configuration Protocol: Used to automatically assign IP addresses from a predefined pool of addresses to computers or devices that request them Digital certificate: An electronic method of providing credentials to a server in order to have access to it or a network Direct Sequence Spread Spectrum DSSS: Modulation technique used by 802.11b wireless devices DMZ
87 Demilitarized Zone. A computer that logically sits in a no-mans land between the LAN and the WAN. The DMZ computer trades some of the protection of the routers security mechanisms for the convenience of being directly addressable from the Internet. DNS Domain Name System: Translates Domain Names to IP addresses Domain name A name that is associated with an IP address Download To send a request from one computer to another and have the file transmitted back to the requesting computer DSL Digital Subscriber Line. High bandwidth Internet connection over telephone lines Duplex Sending and Receiving data transmissions at the sane time Dynamic DNS service Dynamic DNS is provided by companies to allow users with Dynamic IP addresses to obtain a Domain Name that will always by linked to their changing IP address. The IP address is updated by either client software running on a computer or by a router that supports Dynamic DNS, whenever the IP address changes Dynamic IP address IP address that is assigned by a DHCP server and that may change. Cable Internet providers usually use this method to assign IP addresses to their customers. E EAP Extensible Authentication Protocol Email Electronic Mail is a computer-stored message that is transmitted over the Internet Encryption Converting data into cyphertext so that it cannot be easily read Ethernet The most widely used technology for Local Area Networks. F Fiber optic