About Dhcp, Dhcp request and response | Black Box 16 port, 24 port

About DHCP

You can use DHCP to perform the following actions on a single or multiple Console Server (the ‘unit(s)’)s on its/their boot-up:

auto-configure with minimal information; e.g. only an ip address auto-configure with basic setup information (ip address, subnet mask, broadcast address, etc.)

download a new version of software

download a full configuration profile (saved from another unit)

DHCP is particularly useful for multiple installations: you can do all the unit’s configuration in one DHCP file, rather than configure each unit manually.

Another advantage of DHCP is that you can connect a unit to the network, turn on its power and let auto-configuration take place. All the configuration is carried out for you during the DHCP process.

The the unit’s implementation of DHCP is compatible with RFC 951.

On bootup or power-up, the unit will send a broadcast request to the DHCP server(s) on the network. The request contains the ethernet address of the unit; it asks for network configuration details (internet address, subnet mask, etc.). This process is shown in DHCP request and response on page 35.

You can stop the DHCP server from replying to the unit; see Appendix F BOOTP

DHCP request and response

Black Box Console Server user guide

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Black Box 16 port, 24 port manual About Dhcp, Dhcp request and response

Contents

MAY LS50116 LS50116-AE LS50124 LS50124-AE 24 port Console Servers User Guide Instrucciones DE Seguridad Black Box Console Server user guide Black Box Console Server user guide Who this manual is for Purpose of this manual Fast Contents Contents Introduction Installation Configuring Break Pass Through 110 115 144 Set ethernet interface AUI 204 236 Black Box Console Server user guide A p t e r 1 I n t r o d u c t i o n About the Console Server Black Box Console Server user guide Managing devices over the LAN/WAN Managing devices without accessing the LAN/WANManagement and diagnostics Typical applications summary Console Server rear panel Console Server front and rear viewsConsole Server front view Black Box Console Server user guide A p t e r 2 Installation General installation procedure Console Server Rack mounting your Console Server Black Box Console Server user guide Desk mounting your Console Server Multiple stacking your Console Server LED guide Power and network LEDs Console Server During normal operations Black Box Console Server user guide 10/100Base-T Selecting AUI or 10/100 Base T interface Set up procedure Setting up an IP addressSetting up an IP address automatically using Dhcp Black Box Console Server user guide Dhcp request and response About Dhcp Black Box Console Server user guide Black Box Console Server user guide Manually setting up an IP address Set up procedure Black Box Console Server user guide Are valid, should not need recourse to a Radius host Tip Parameter Description Server form field descriptions Dhcp Gui access Logging onto your Console Server Accessing the Console Server configuration software Adding a Host Setting up your network parametersSetting up the host table Black Box Console Server user guide Changing a Host Deleting a host Factory default password is superuser Changing the Admin PasswordCli syntax set user password Radius configuration Black Box Console Server user guide Accept the form you will be returned to the menu Radius host Accounting flag State of Radius Result Specified Radius parameters description 0a000006 Cli syntax add DNS Delete DNS DNS configuration Add Wins Wins configuration Active and passive gateways Configuring network gateways Adding a gateway Gateway From the Network Configuration menu, select ‘Gateway’Deleting a Gateway Delete Ping hostname Verifying your network installation Saving to non-volatile memory Saving configuration changes Saving to a file Setting date and time Performing a soft reboot Resetting to factory defaults using reset switch Restoring factory default settingsResetting to factory defaults using software Black Box Console Server user guide Black Box Console Server user guide A p t e r 3 S y s t e m a d m i n i s t r a t i o n Security Setting up the line on your Console Server Typical Reverse Telnet Configuratio n Viewing and editing your line settingsLines set to reverse Telnet by default Black Box Console Server user guide Lost password Deciding whether to use Slip or PPP Configuring a dial in lineIntroduction to Slip and PPP connections Show line Setting up the line Option Description Service option Router use only Service option Description OptionDescription Configuring Slip Interactive OptionDescription Show PPP Line Now select a line Configuring PPPPPP configuration procedure PPP form field descriptions Black Box Console Server user guide Black Box Console Server user guide Black Box Console Server user guide Be set ppp li 1 user kevinc8 Password IP address negotiation Black Box Console Server user guide Roaming Callback Black Box Console Server user guide Set modem Configuring a modemCli syntax Add modem Configuring users Black Box Console Server user guide Overview When Radius authenticates usersAbout user accounts and Radius Black Box Console Server user guide Example Radius user file telnet service Adding a user account Values Configuring a user accountConfiguration procedure Choose your user from the list of names now displayed 100 User form field descriptions 101 Particular line to ‘cslogin’ see Setting up the line onParticular port to ‘cslogin’ see Setting up the line on 102 103 104 Callback for a user 105 106 107 About user levelsCLI prompts 108 Changing a user’s passwordDeleting a user account 109 Configuring Break Pass Through 110 Resetting the line to default 111 Saving your settingsSaving settings to non-volatile memory Saving settings to a file 112 113 114 115 A p t e r 4 U s i n g y o u r C o n s o l e S e r v e r 116 Introduction 117 Accessing devices via Telnet from the LANAccess procedure Information required 118 Accessing devices via SSHSSH Setup Procedure 119 120 Required Information 121 122 Accessing devices via modems using PPP 123 Accessing devices via modems using a dumb device 124 125 Server console serverThis appendix includes the following sections 126 Pin locations RJ45 connectorsRJ45 RS232 serial ports Circuit Direction Function 127 Pin numbering in the RJ45 connectors 128 Pin SignalAUI port 129 Pin Signal FunctionRJ45 10/100BaseT port 130 Admin Port 131 Direct 11 ConnectionsExample direct connections 132 Sun Microsystem servers 133 134 Cisco RJ45 console ports with software flow controlBlack Box 833AS Black Box Series router console port 135 IBM RS6000 136 Connection from the 25-pin Admin Port to a PCPC serial port PC, example connections 137 138 Terminals slow speed or using software flow controlTerminals 139 Connection from the 25-pin Admin Port to a Terminal 140 ModemsDirect connections 141 P e n d i x B T h e C L I c o m m a n d s Inetaddress CLI commandsAdd community Add DNS 143 Menu Network Configuration DNS Add DNS Equivalent See also 144 Add gatewayAdd host 145 146 Where Host typeAdd modem Add radius 147 Add trapAdd user Add Wins Delete community AdminDebug Delete ARP 149 Delete DNSDelete gateway Delete host 150 Menu Network Configuration Host Table Equivalent See alsoDelete modem Delete radius 151 Delete trapDelete user Delete Wins 152 HeapSyntax heap 153 HelpKill line Logout 154 NetloadWhere 155 Software When you reboot the unit. See reboot on 156 Netsave 157 158 PingPacketsize 159 160 RebootReset factory Reset line Menu None available Equivalent See also Reset userRestart Resume 162 Also use this argument to log in as someone else RloginMenu Sessions Start telnet/rlogin Equivalent See also Save 164 ScreenSet contact Set date Syntax Set ethernet interface RJ45Set ethernet interface AUI Set gateway 166 Set hostSet line Normal 167 Line service can be used to dedicate the line to a specificEnter their login name just their password Nouser 168 169 Set locationRouting Set to None off, send, listen or send & listen 170 Set ppp lineParameter syntax Parameter name 171 172 Set radius 173 Unit afterwards use the command ‘reboot’Set server Subnet 174 JETset Programme is controlled by passwordOr OFF. The default is OFF Gui-status 176 Login prompt uses OEM1 string 177 Send Break Option 178 179 Menu equivalents See alsoBreak Sshbreakstring 180 Set slip line 181 Syntax Command telnetSet telnet 182 Set timeSet user For example set time 183 184 185 User levels admin, normal Syntax Menu equivalent See alsoShow ARP Show date Menu Main Menu Hardware Equivalent See also Admin, is normal SyntaxShow gateways Show hardware 187 Show hostsShow interfaces Normal Syntax 188 Show line 189 190 191 Admin Normal SyntaxShow modems This will show for example 192 Show ppp lineNormal line 193 194 Show radiusShow routes Menu There is no menu equivalent Equivalent 195 196 Menu Server configuration Equivalent See alsoShow server 197 Show slip line 198 Menu Network configuration snmp Equivalent See alsoShow snmp 199 User levels admin, normalShow telnet Show time Start Syntax Target login directory, you will be logged straightWhere n is the predefined session that you want to start Show user Inetaddress Termtype TelnetMenu Sessions Start Predefined Session Equivalent See also Set telnet or show telnet can be saved permanently 202 VersionNormal Syntax version 203 P e n d i x C S N M P 204 Overview Delete Community Configuring Snmp supportAdd Community 206 207 Summary of objects in the private MIB 208 209 Private MIB definitions 210 211 212 213 Network managementEditing RFC1213 214 EditingRouting information 215 P e n d i x D U p g r a d i n g y o u r f i r m w a r e 216 Using a Bootp server see Using Bootp from a boothost on Cli syntax netload software Saving your existing ConfigurationExample of saving a configuration file Using Tftp from a host 218 Tftp configuration 219 Writing to Flash memory 220 Using Bootp from a boothost 221 Upgrade using JETset, the web browser interfaceEnabling BOOTP/DHCP after upgrading software Disable BOOTP/DHCP 222 223 List of line service types 225 Line Service Description/UsesExample TypeSilent 226 227 P e n d i x F B O O T P 228 229 How Bootp worksBootp request and response 230 231 How to setup BootpBootptab file entry Bootptab file entry for a single unit 232 233 234 BootfileBootfile 235 Parameter Value Brief Meaning Fuller explanation 236 Bootp messages output to screenDisabling the Bootp reply 237 # ht=1\ # ha=0080ba000057\ # gw=192.101.35.254\ 238 Booting multiple unitsBootptab file entry for multiple units 239 240 Multiple Bootp serversExample of Bootp 241 Bootptab file 242 243 You need toServer JETset utility 244 Introduction to JETsetJETsethome 245 To access JETset 246 Using JETsetUsing JETset Netscape Navigator configuratio n 247 Internet Explorer configuratio n 248 249 JETset program summary 250 251 P e n d i x H Troubleshooting 252 General communication matters 253 Host problems 254 JETset problems 255 Login problems 256 You have lost or dont know your password as ‘admin’ user 257 Problems with terminals 258 Emergency recoveryProblems with framed Routing 259 Index 260 261 262 Copyright 2001. Black Box Corporation. All rights reserved