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Tiago Marques

Linux Command Directory: Index - 0 views

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    This directory of Linux commands is from Linux in a Nutshell, 3rd Edition. Click on any of the 379 commands below to get a description and list of available options.
Liam Russell

Linux Commands - A practical reference - 0 views

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    A linux command line cheat sheet
John Twohig

Private IP Addresses - 0 views

  • IP Helper-Address The ip helper-address command is a static command that is configured on a router interface to direct broadcasts to desired destinations within your internetwork. Configuring the ip helper-address command is simple and straightforward. You just have to be aware of which interface the broadcasts are being received on and where you want to forward these broadcasts to. For example, in Figure 7.21, the 2501A router Ethernet0 interface receives a Dynamic Host Configuration Protocol (DHCP) client request from HostA, which is a broadcast looking for a DHCP server. Figure 7.21: An ip helper-address single server example The 2501A router needs to be configured as follows: 2501A#config t 2501A(config)#interface ethernet0 2501A(config-if)#ip helper-address 172.16.30.2 The 2501A router now receives the DHCP client broadcast and forwards this broadcast to the DHCP server, which then provides a DHCP address to the client. If you have more than one DHCP server for redundancy purposes, as shown in Figure 7.22, you can configure a subnet broadcast address instead of a single server address. Figure 7.22: An ip helper-address multiple server example The 2501A router would be configured as follows: 2501A#config t 2501A(config)#interface ethernet0 2501A(config-if)#ip helper-address 172.16.30.255 The 2501 router now takes a DHCP client broadcast and sends this to any DHCP server on the 172.16.30.0 network. Remember that when you enable the ip helper-address command, you are forwarding more than just DHCP requests. Let’s discuss all the ports that are being forwarded
David Power

Linux and Open Source Software Blog by Vivek | nixCraft - 0 views

shared by David Power on 01 Mar 09 - Cached
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    Nice site with short but detailed descriptions on most Linux commands, covers most distros.
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    Detailed descriptions on most Linux commands.
Tim Horgan

Quick HOWTO : Ch18 : Configuring DNS - Linux Home Networking - 0 views

  • The only DNS configuration file for a DNS client is the /etc/resolv.conf file, which defines the IP address of the DNS server it should use.
    • Tim Horgan
       
      Edit file: /etc/resolv.conf
  • There are 13 root authoritative DNS servers
    • Tim Horgan
       
      BIND supplies these IP addresses at startup.
  • host www.linuxhomenetworking.com
  • ...12 more annotations...
  • host 65.115.71.34
  • nslookup www.linuxhomenetworking.com
  • nslookup 65.115.71.34
  • The Host Command
  • The nslookup Command
  • chkconfig named on
  • [root@bigboy tmp]# /etc/init.d/named start [root@bigboy tmp]# /etc/init.d/named stop [root@bigboy tmp]# /etc/init.d/named restart
    • Tim Horgan
       
      can also use: service named start service named stop service named restart
  • DNS clients (servers not running BIND) use the /etc/resolv.conf file to determine both the location of their DNS server and the domains to which they belong.
  • The /etc/resolv.conf File
  • /etc/resolv.conf
    • Tim Horgan
       
      nano /etc/resolv.conf
  • Configuring resolv.conf
  • Creating a named.conf Base Configuration
Tim Horgan

Working with VI - 0 views

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    Vi is a text editor found in most UNIX environments. What is normally installed is a program called vim, which stands for vi improved. You can start vi (or vim) by typing vi at the UNIX command prompt.
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