| 1 | % Netdot exercise |
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| 2 | % Network Management Topics |
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| 3 | |
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| 4 | # Introduction |
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| 5 | |
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| 6 | The Network Documentation Tool (Netdot) is an open source software designed to |
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| 7 | help network administrators collect, organize and maintain network |
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| 8 | documentation. Netdot is actively developed at the University of Oregon. |
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| 9 | |
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| 10 | ## Goals |
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| 11 | |
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| 12 | In these exercises we will install Netdot and demonstrate some of its most |
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| 13 | important features. |
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| 14 | |
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| 15 | ## Notes |
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| 16 | |
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| 17 | * Commands preceded with "$" imply that you should execute the command as |
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| 18 | a general user - not as root. |
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| 19 | * Commands preceded with "#" imply that you should be working as root. |
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| 20 | * Commands with more specific command lines (e.g. "RTR-GW>" or "mysql>") |
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| 21 | imply that you are executing commands on remote equipment, or within |
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| 22 | another program. |
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| 23 | |
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| 24 | # Installation |
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| 25 | |
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| 26 | _Netdot may already be installed in your PC. Ask the instructor._ |
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| 27 | |
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| 28 | Log in to your virtual machine as the sysadm user and make sure your machine |
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| 29 | is up-to-date with the rest of the class: |
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| 30 | |
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| 31 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 32 | $ sudo apt-get install snmp snmp-mibs-downloader snmpd cacti smokeping \ |
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| 33 | nagios3 joe postfix |
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| 34 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 35 | |
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| 36 | ## Download the Package |
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| 37 | |
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| 38 | First check if it's available in your classroom's NOC server: |
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| 39 | |
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| 40 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 41 | $ cd |
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| 42 | $ wget http://noc.ws.nsrc.org/downloads/netdot-1.0.4.tar.gz |
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| 43 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 44 | |
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| 45 | If not, try from the official site: |
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| 46 | |
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| 47 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 48 | $ wget http://netdot.uoregon.edu/pub/dists/netdot-1.0.4.tar.gz |
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| 49 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 50 | |
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| 51 | Unpack the tarball: |
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| 52 | |
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| 53 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 54 | $ tar xzvf netdot-1.0.4.tar.gz |
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| 55 | $ cd netdot-1.0.4 |
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| 56 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 57 | |
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| 58 | ## Install dependencies: |
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| 59 | |
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| 60 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 61 | $ sudo apt-get install build-essential |
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| 62 | $ sudo make apt-install |
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| 63 | |
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| 64 | Which RDBMS do you plan to use as backend: [mysql|Pg]? mysql |
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| 65 | |
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| 66 | We need to add a temporary repository of Netdot dependencies until all packages |
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| 67 | are in Debian/Ubuntu official repositories. |
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| 68 | Would you like to continue? [y/n] y |
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| 69 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 70 | |
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| 71 | This will download a lot of packages. Be patient. |
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| 72 | |
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| 73 | (If you had not installed mysql-server, you'll be asked for a DBA password. |
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| 74 | Ask the instructor for the Mysql root password). |
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| 75 | |
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| 76 | Say yes here: |
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| 77 | |
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| 78 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 79 | We will install the MIB files now. Continue? [y/n] y |
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| 80 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 81 | |
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| 82 | If you see this prompt, then answer yes: |
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| 83 | |
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| 84 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 85 | A new /etc/snmp/snmp.conf needs to be installed to point to the newly |
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| 86 | installed MIB files. The current file will be backed up. Continue? [y/n] y |
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| 87 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 88 | |
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| 89 | At the end of the installation you will see a list of Perl modules that |
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| 90 | have been installed (OK). If any did not install you will see "MISSING". |
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| 91 | |
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| 92 | If any of them are missing, type: |
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| 93 | |
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| 94 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 95 | $ sudo make installdeps |
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| 96 | |
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| 97 | Which RDBMS do you plan to use as backend: [mysql|Pg]? mysql |
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| 98 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 99 | |
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| 100 | You will now see three questions concerning CPAN setup to download the missing |
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| 101 | PERL dependency. Answer like this: |
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| 102 | |
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| 103 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 104 | Would you like to configure as much as possible automatically? [yes] yes |
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| 105 | |
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| 106 | What approach do you want? (Choose 'local::lib', 'sudo' or 'manual') |
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| 107 | [local::lib] <ENTER> |
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| 108 | |
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| 109 | Would you like me to automatically choose some CPAN mirror |
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| 110 | sites for you? (This means connecting to the Internet) [yes] |
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| 111 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 112 | |
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| 113 | If you still see missing dependencies do: |
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| 114 | |
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| 115 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 116 | $ sudo make installdeps |
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| 117 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 118 | |
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| 119 | Until you don't see any more missing dependencies. |
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| 120 | |
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| 121 | This will try to install the missing modules using the CPAN archive. At the |
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| 122 | end, all the modules should show "ok". |
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| 123 | |
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| 124 | ## Initialize the site configuration: |
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| 125 | |
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| 126 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 127 | $ cd ~/netdot-1.0.4/ |
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| 128 | $ cp etc/Default.conf etc/Site.conf |
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| 129 | $ editor etc/Site.conf |
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| 130 | |
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| 131 | Find and change the following values: |
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| 132 | |
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| 133 | NETDOTNAME => 'pcX.ws.nsrc.org', |
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| 134 | DB_DBA_PASSWORD => '(the password you used when installing mysql)', |
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| 135 | DEFAULT_SNMPCOMMUNITIES => ['NetManage', 'public'], |
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| 136 | NMS_DEVICE => 'pcX.ws.nsrc.org', |
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| 137 | DEFAULT_DNSDOMAIN => 'ws.nsrc.org', |
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| 138 | DEVICE_NAMING_METHOD_ORDER => [ 'sysname', 'snmp_target' ], |
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| 139 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 140 | |
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| 141 | Save and exit from the file. |
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| 142 | |
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| 143 | ## Install the application and initialize the database. |
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| 144 | |
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| 145 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 146 | $ sudo make installdb |
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| 147 | $ sudo make install APACHEUSER=www-data APACHEGROUP=www-data |
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| 148 | $ sudo ln -s /usr/local/netdot/etc/netdot_apache2_local.conf \ |
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| 149 | /etc/apache2/conf.d/ |
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| 150 | $ sudo service apache2 graceful |
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| 151 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 152 | |
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| 153 | Install the cron jobs for automated tasks |
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| 154 | |
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| 155 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 156 | $ sudo cp netdot.cron /etc/cron.d/netdot |
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| 157 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 158 | |
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| 159 | # Operation |
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| 160 | |
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| 161 | ## Log into the web interface |
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| 162 | |
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| 163 | In your browser, go to: |
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| 164 | |
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| 165 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 166 | http://pcX.ws.nsrc.org/netdot |
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| 167 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 168 | |
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| 169 | Log in with username: admin and password: admin |
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| 170 | |
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| 171 | ## Changing default passwords |
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| 172 | |
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| 173 | Netdot comes with three default user accounts. You should change the default |
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| 174 | passwords on those. |
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| 175 | |
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| 176 | Go to the "Contacts" tab, then search for "Admin". You should see the details |
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| 177 | for the Admin user. Click on [edit], and find the Password field. Type the |
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| 178 | password you used to log in to your PC, then click on the "Update" button. |
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| 179 | |
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| 180 | Repeat the same steps for the other default users: |
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| 181 | |
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| 182 | * operator |
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| 183 | * guest |
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| 184 | |
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| 185 | ## Discovering devices |
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| 186 | |
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| 187 | If you have not done so yet, configure SNMP on your PC and your router. |
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| 188 | |
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| 189 | _Ask the instructor to provide you with instructions for configuring SNMP |
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| 190 | on Cisco routers and Linux_ |
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| 191 | |
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| 192 | Now back to Netdot. Let's create a file with all the devices in the lab network |
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| 193 | that respond to SNMP: |
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| 194 | |
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| 195 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 196 | $ editor /home/sysadm/discoverme.txt |
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| 197 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 198 | |
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| 199 | Copy and paste the following list: |
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| 200 | |
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| 201 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 202 | gw.ws.nsrc.org NetManage |
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| 203 | s1.ws.nsrc.org NetManage |
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| 204 | sw.ws.nsrc.org NetManage |
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| 205 | rtr1.ws.nsrc.org NetManage |
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| 206 | rtr2.ws.nsrc.org NetManage |
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| 207 | rtr3.ws.nsrc.org NetManage |
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| 208 | rtr4.ws.nsrc.org NetManage |
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| 209 | rtr5.ws.nsrc.org NetManage |
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| 210 | rtr6.ws.nsrc.org NetManage |
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| 211 | rtr7.ws.nsrc.org NetManage |
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| 212 | rtr8.ws.nsrc.org NetManage |
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| 213 | rtr9.ws.nsrc.org NetManage |
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| 214 | pc1.ws.nsrc.org NetManage |
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| 215 | pc2.ws.nsrc.org NetManage |
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| 216 | pc3.ws.nsrc.org NetManage |
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| 217 | pc4.ws.nsrc.org NetManage |
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| 218 | pc5.ws.nsrc.org NetManage |
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| 219 | pc6.ws.nsrc.org NetManage |
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| 220 | pc7.ws.nsrc.org NetManage |
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| 221 | pc8.ws.nsrc.org NetManage |
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| 222 | pc9.ws.nsrc.org NetManage |
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| 223 | pc10.ws.nsrc.org NetManage |
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| 224 | pc11.ws.nsrc.org NetManage |
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| 225 | pc12.ws.nsrc.org NetManage |
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| 226 | pc13.ws.nsrc.org NetManage |
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| 227 | pc14.ws.nsrc.org NetManage |
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| 228 | pc15.ws.nsrc.org NetManage |
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| 229 | pc16.ws.nsrc.org NetManage |
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| 230 | pc17.ws.nsrc.org NetManage |
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| 231 | pc18.ws.nsrc.org NetManage |
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| 232 | pc19.ws.nsrc.org NetManage |
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| 233 | pc20.ws.nsrc.org NetManage |
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| 234 | pc21.ws.nsrc.org NetManage |
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| 235 | pc22.ws.nsrc.org NetManage |
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| 236 | pc23.ws.nsrc.org NetManage |
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| 237 | pc24.ws.nsrc.org NetManage |
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| 238 | pc25.ws.nsrc.org NetManage |
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| 239 | pc26.ws.nsrc.org NetManage |
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| 240 | pc27.ws.nsrc.org NetManage |
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| 241 | pc28.ws.nsrc.org NetManage |
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| 242 | pc29.ws.nsrc.org NetManage |
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| 243 | pc30.ws.nsrc.org NetManage |
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| 244 | pc31.ws.nsrc.org NetManage |
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| 245 | pc32.ws.nsrc.org NetManage |
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| 246 | pc33.ws.nsrc.org NetManage |
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| 247 | pc34.ws.nsrc.org NetManage |
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| 248 | pc35.ws.nsrc.org NetManage |
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| 249 | pc36.ws.nsrc.org NetManage |
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| 250 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 251 | |
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| 252 | Now, tell Netdot to discover those devices: |
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| 253 | |
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| 254 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 255 | $ cd /usr/local/netdot |
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| 256 | $ sudo bin/updatedevices.pl -E /home/sysadm/discoverme.txt -IAF |
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| 257 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 258 | |
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| 259 | When that is done, go to the web interface and navigate to |
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| 260 | |
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| 261 | Management -> Devices |
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| 262 | |
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| 263 | Leave the search box empty, and click on the "Find" button. |
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| 264 | |
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| 265 | You should see all the discovered devices in that list. Go to the link for your |
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| 266 | group's router (e.g. rtrX.ws.nsrc.org) |
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| 267 | |
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| 268 | * Navigate to all the tabs: Basic, Interfaces, Modules, IP Info, etc. |
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| 269 | Netdot allows you to augment the information gathered from the device |
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| 270 | with details entered manually. |
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| 271 | |
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| 272 | * In the ARP section, you should see one entry with a timestamp. |
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| 273 | Click on that entry. You should see a table associating IP addresses |
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| 274 | with MAC addresses. This is the ARP table discovered from rtr1. You should |
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| 275 | see your PC's IP address and MAC address. |
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| 276 | |
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| 277 | |
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| 278 | ## Finding a computer in your network |
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| 279 | |
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| 280 | * Obtain the MAC address from your laptop (or desktop). Copy it in the clipboard. |
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| 281 | * In the Netdot web interface, go to Management -> Devices |
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| 282 | * Paste your MAC address and hit ENTER |
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| 283 | |
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| 284 | Netdot will show you which devices were seeing that MAC address the last |
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| 285 | time that it discovered the network. |
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| 286 | |
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| 287 | ## Managing IP address space |
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| 288 | |
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| 289 | Go to Management -> Address Space |
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| 290 | |
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| 291 | You should see a list of private IP blocks (from RFC-1918). These come |
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| 292 | pre-installed in Netdot. |
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| 293 | |
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| 294 | Click on 10.0.0.0/8 |
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| 295 | |
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| 296 | You will see a list of discovered IP blocks, which are marked as "Subnets". |
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| 297 | These were found in routers. |
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| 298 | |
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| 299 | * Click on 10.10.1.0/24. |
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| 300 | * Click on [edit] |
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| 301 | * In the Description field, type "Group 1 PCs" |
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| 302 | * Click "Save" |
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| 303 | |
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| 304 | ### Create a container to include all the group subnets |
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| 305 | |
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| 306 | In the section called "Address Space Tasks" on top, click on the "[new]" |
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| 307 | button and enter the following: |
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| 308 | |
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| 309 | * IP/Prefix: 10.10.0.0/16 |
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| 310 | * Owner: click on [new]. |
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| 311 | * In the new "Entity" window, enter: |
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| 312 | * Name: NSRC Lab |
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| 313 | * Insert button, then [close] |
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| 314 | * Used by: (leave blank) |
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| 315 | * Status: Container |
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| 316 | * Description: NSRC lab student networks |
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| 317 | * Save |
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| 318 | |
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| 319 | You should now see the new Container page. It shows a graphical representation |
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| 320 | of the /16 block. All the existing subnets are shown in red. The green space |
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| 321 | represents unused or available address space. |
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| 322 | |
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| 323 | * On the top of the graph there is a section called "Zoom: set one row equal to" |
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| 324 | Select /24 from the drop-down menu. Each row now represents a /24 block |
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| 325 | * Click on [Tree View] to see a tree graph view of the IP hierarchy |
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| 326 | |
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| 327 | ## Polling devices |
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| 328 | |
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| 329 | Periodically you will want to connect again to your routers and switches to |
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| 330 | fetch their routing tables, forwarding tables etc. You can run the command which |
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| 331 | does this: |
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| 332 | |
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| 333 | ~~~ |
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| 334 | $ sudo /usr/local/netdot/bin/updatedevices.pl -DIFAT |
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| 335 | ~~~ |
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| 336 | |
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| 337 | * -D: poll all devices already in the database |
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| 338 | * -I: get device info (e.g. sysName) |
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| 339 | * -F: get switch forwarding tables |
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| 340 | * -A: get router ARP tables |
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| 341 | * -T: re-calculate the topology |
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| 342 | |
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| 343 | To avoid having to run this by hand, you can install a crontab which will |
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| 344 | do it automatically at set times of day. We installed the crontab file in |
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| 345 | /etc/cron.d previously. If you look in /etc/cron.d/netdot you will see that |
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| 346 | this command executes once each hour by default. |
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| 347 | |
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| 348 | |
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| 349 | # More information |
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| 350 | |
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| 351 | [Official Netdot Website](http://netdot.uoregon.edu) |
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| 352 | |
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| 353 | |
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| 354 | |
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| 355 | |
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