Configure ADSL

Introduction:

Here, we will configure ADSL by setting up the second NIC to communicate with the ADSL modem.

Aim:

Set up the server to be the external communications hub for the network.

Requirements:

None.

Procedure:

• Log in as root
• Configure the External NIC:
• -Applications-
• -System Tools-
• -Internet Configuration Wizard-
• -Ethernet Connection- [Forward]
• -D-Link System Inc RTL8139 Ethernet (eth0)- [Forward]
• Automatically obtain IP address settings with: [dhcp] [Forward]
• [Apply]
  
• -File-
• -Save-
• Information... [OK]
  
• (exit)
• Set up loopback (the GUI desktop needs this, amongst others):
• Open Terminal.
• # vi /etc/hosts
• Make sure these exist (put a 'tab' between the parts):

• 127.0.0.1     localhost.localdomain     localhost
  192.168.0.2   lisa.steveroach.org       lisa
  

Testing:

• Connect a normal CAT5 cable between the ADSL modem and the NIC.
• Reboot the Linux box.
• You should see the following during startup:
  

Bringing up interface eth0: [ OK ] Determining IP information for eth0... done [ OK ]

• Log in as root.
• Open Terminal.
• # ifconfig eth0
• This comes back with a few lines of information. The fourth line down (something like; 'UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1') should contain the flags 'UP' and 'RUNNING'.
• Now check out the line starting with 'inet'. Right now mine looks like; 'inet addr:10.1.1.2 Bcast:10.255.255.255 Mask:255.0.0.0'. What you want is the first IP address - in this case 10.1.1.2. Note that this can change between reboots or modem resets.
  
• # ping [that IP address you just got from ifconfig] (this is the ADSL modem assigned IP)
• # ping 10.1.1.1 (this is my ADSL modem fixed DNS IP)
• # ping www.blogspot.com (a domain that returns pings)
• In all cases, there should be a list of times for the ping round-trip. Type Ctrl-C to stop the listing.
• You can switch the cable back to your PC now, if you like - or stay connected as you are and do the next step; Get Latest Packages.