ELSA Cable manual VI Content

Page 6

English

VI Content

Security for your LAN

30

Encryption

31

TCP/IP packet filters

31

The hiding place—IP masquerading (NAT, PAT)

31

IP routing

32

The IP routing table

32

Dynamic routing with IP RIP

34

Local routing

35

IP masquerading (NAT, PAT)

36

DNS forwarding

38

Bridging

39

Automatic address administration with DHCP

40

The DHCP client

41

The DHCP server

41

DHCP – 'on', 'off' or 'auto'?

42

How are the addresses assigned?

42

Technical basics

47

Cable modem technology

47

Standards

47

Access

47

Registration in the cable network

48

Network technology

50

The network and its components

50

Connection modes

50

Kinds of networks

52

IP addressing

52

IP routing and hierarchical IP addressing

55

Expansion through local networks

57

Appendix

63

Technical data

63

Warranty conditions

65

Declaration of conformity

67

Description of the menu options

73

Status

75

Status/Operating-time

76

Status/Current-time

76

Status/cable-statistics

76

Status/LAN-statistics

77

Status/bridge statistics

78

Status/TCP-IP-statistics

79

ELSA Cable Modem

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Contents Manual Aachen ELSA, IncSonnenweg Germany Thank you for placing your trust in this Elsa product Introducing the Elsa MicroLink CablePage Content Elsa Cable ModemVI Content Setup/SNMP-module Viii Content What does the unit look like? Introducing the Elsa MicroLink CableElsa MicroLink Cable Meanings of the specific blink codes SyncBC D E F G These LEDs show the corresponding network controller statusFast Internet Highlights of the Elsa MicroLink CableNode or hub? Cable networkMore than just Internet Regional contentInternet at all times-always online BackboneProxy servers CE conformity and FCC radiation standard CE and FCCIntroducing the Elsa MicroLink Cable Installation and configuration Elsa MicroLink CableConfiguring the Elsa MicroLink Cable First StepsQuick Start Quick configurations Configuration as a bridgePreparations LAN Configuration as a router Off you go into the Web with a whole new sensation of speedOn the Router tab, enable the IP Router option TCP/IP installation Configuring fixed IP addresses not using DhcpObtain IP addresses automatically use Dhcp Checking the IP configuration Requirements for inband configuration Configuration modesUser-friendly method inband Starting inband configuration using Elsa LANconfig Start up inband configuration using telnetConfiguration commands This command Means this For instanceSet/se/snmp/admin The Administrator Whats happening on the line? How to start a traceCommand to call up a trace follows this syntax Trace OutputsNew firmware with FirmSafe This is how FirmSafe worksExamples How to load new software Elsa LANconfigConfiguration using Snmp General TftpAccessing tables and parameters using Snmp Access protection in SnmpCommand Target/Source Function Deleting rows in tables using Snmp Appending rows to tables using SnmpIP address IP-netmask Router name Distance Error messages via Snmp trap Management Information Base MIBConfiguration modes Login barring Security for your configurationPassword protection Operating modes and functionsAccess control via TCP/IP Security for your LANGlobally to Encryption TCP/IP packet filtersHiding place-IP masquerading NAT, PAT IP routing IP routing tableIP address IP netmask Router Dis Tance IP address IP netmask Router name Dist This is what happens 192.168.130.0 255.255.255.0What do the entries mean? Dynamic routing with IP/RIPWhat information is propagated by IP/RIP? IP address IP netmask Time Distance RouterLocal routing Interaction of static and dynamic tablesIP masquerading NAT, PAT Two addresses for the routerCable TV net How does IP masquerading work?Simple and inverse masquerading WorkWhich protocols can be transmitted using IP masquerading? DNS forwardingOnly small difference is that Bridging RatorAutomatic address administration with Dhcp What are the filter options?Cable modem really belongs to two LANs Dhcp clientDhcp server IP address Network mask Broadcast addressHow are the addresses assigned? Default state is autoDhcp on, off or auto? IP address assignmentBroadcast address assignment Default gateway assignmentNetwork mask assignment DNS server assignmentPriority for the Dhcp server Request assignment Priority for a workstation-overwriting an assignmentOperating modes and functions Operating modes and functions Elsa MicroLink Cable Cable modem technology AccessTwo standards get around this problem StandardsRegistration in the cable network Network of the cable network Cable TV netOperator Work Registration Network technology Network and its componentsConnection modes Host IP addressing Kinds of networksExamples Same IP address, this time with another netmaskThis address Bytes Looks like this in bits IP address Netmask Remark 10.0.0.0 255.0.0.0There are two considerations when using these IP addresses IP routing and hierarchical IP addressingHost Smith External host Marketing Example Expansion through local networks Easy as possible Why a LAN is called multiprotocol-capable80-C7-6D-A4-6E That is processed by all computers in the LANData transfer within the LAN Interface only understands MAC addressesLAN as easy as possible Host Smith Data transfer from the LAN onto the Internet LAN coupling on MAC basisTechnical basics Elsa MicroLink Cable Technical data AppendixPackage contents ServiceWarranty period Warranty conditionsWarranty coverage Warranty procedureOperating mistakes Additional regulationsDeclaration of conformity TypenbezeichnungAppendix Elsa MicroLink Cable Index 17, 32 Inde7032, 40 Gateway Heap reserve 17, 18Setup TraceWireless links Inde72Symbols Description of the menu options R73R74 Description of the menu options Overview of the menusStatus Description of the menu options R75Status Running status displays Status/Cable-statistics Status/Operating-timeStatus/Current-time R76 Description of the menu optionsStatus/LAN-statistics Description of the menu options R77LAN-statistics Running status displays Cannot be modified manually Status/Bridge-statisticsR78 Description of the menu options Bridge-statistics Running status displaysStatus/TCP-IP-statistics/ARP-statistics Status/TCP-IP-statisticsDescription of the menu options R79 These statistics include the following valuesR80 Description of the menu options Status/TCP-IP-statistics/IP-statisticsStatus/TCP-IP-statistics/ICMP-statistics Description of the menu options R81 Status/TCP-IP-statistics/TCP-statisticsStatus/TCP-IP-statistics/TFTP-statistics R82 Description of the menu options Status/TCP-IP-statistics/DHCP-statisticsShrinks accordingly. It has the following layout Status/IP-router-statisticsDescription of the menu options R83 IP-router-statistics Statistics from the IP router areaProtocol LAN-tx Cable-tx R84 Description of the menu optionsStatus/IP-router-statistics/RIP-statistics IP-address IP-netmask Time Distance RouterStatus/Queue-statistics Status/Config-statisticsConfig-statistics Remote configuration statistics Description of the menu options R85R86 Description of the menu options IPr-RIP-queue-packetsDescription of the menu options R87 Status/MCNS-statisticsStatus/Init-status MCSN-statisticsStatus/DHCP-client-statistics SetupSystem configuration R88 Description of the menu optionsEntering the following command Setup/Cable-moduleSetup/LAN-module Default configuration, no name is enteredSetup/Bridge-module R90 Description of the menu optionsSetup/TCP-IP-module Description of the menu options R91MAC-address field Configuration, the TCP/IP module is activated R92 Description of the menu optionsDescription of the menu options R93 IP-address Node-ID Last-access Connect Setup/IP-router-moduleConfiguration, the IP router module is activated IP-router-module IP router module settingsDescription of the menu options R95 IP-address IP netmask Router-name DistanceSetup/IP-router-module/Routing-method Routing-method Routing method settingsR96 Description of the menu options Settings have the following meaning Setup/IP-router-module/RIP-configurationDifferent settings have the following meaning Description of the menu options R97Setup/IP-router-module/Masquerading R98 Description of the menu optionsFollowing layout Setup/IP-router-module/firewall Description of the menu options R99R10 Description of the menu options Description of the menu options R10 Setup/SNMP-moduleSetup/DHCP-server-module On The device operates as a Dhcp serverOff The device does not operate as a Dhcp server Default value of 6000 minutes equals approximately 4 daysR102 Description of the menu options Network mask is assigned in the same way as the IP addressConfig-module Configuration module settings Setup/Config-moduleIP-address Node-ID Timeout Hostname Type Description of the menu options R103Firmware Display and keyboard settings FirmwareR104 Description of the menu options Description of the menu options R105 Module VersionPosition Status Version Date Size Index R106 Description of the menu options This option allows you to reboot the deviceOther Other menu allows you to manage the following functions