setup apt-get to use http proxty

Setting up apt-get to use a http-proxy

These are three methods of using apt-get with a http-proxy.

Temporary proxy session

This is a temporary method that you can manually use each time you want to use apt-get through a http-proxy. This method is useful if you only want to temporarily use a http-proxy.

Enter this line in the terminal prior to using apt-get (substitute your details for yourproxyaddress and proxyport).

export http_proxy=http://yourproxyaddress:proxyport

source - https://help.ubuntu.com/community/AptGet/Howto 

read syslog in ubuntu

tail /var/log/syslog

Ubuntu network config

Quote:

ifconfig -a

your new NIC shows up, albeit without an ip address. The trouble may well be, that on Ubuntu server, new NIC's, although automatically recognized, don't activate by default. Assuming that ifconfig shows your card, look at

Code:

/etc/network/interfaces

and see if your new card is there. If not, add something like:

Code:

auto eth1
iface eth1 inet dhcp

to use dhcp, or something like

Code:

auto eth1
iface eth1 inet static
address 192.168.1.50
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1

to use a static IP address.

When you have finished, run

Code:

/etc/init.d/networking restart

or just restart the server. That might well fix your problem. Good luck!

source - http://www.linuxquestions.org/questions/linux-server-73/does-a-new-nic-need-to-be-manually-configured-in-ubuntu-server-643580/

Configure IP address in Redhat 6

Configure on commad-line by edit configuration file (Permanently)

1. Open Terminal.
2. Open network configuration file. In this example, it’ll configure on interface eth0. Type
   

   vi /etc/sysconfig/network-scripts/ifcfg-eth0

   
3. The current configuration is DHCP.
   
4. Modify the file by press ‘i’ to enter insert mode. Change BOOTPROTO to static and add IP Address and Net mask as new lines if they’re not existed yet..
   

   BOOTPROTO=static
   IPADDR=192.168.125.10
   NETMASK=255.255.255.0

   Save the configuration file by press ESC + ‘:’ and type ‘wq’ to write and quit the editor.
   
5. You can added these configuration to the config file. Replace [number] with your actual value.
   

   GATEWAY=[number]
   TYPE=Ethernet
   NETWORK=[number]
   BROADCAST=[number]

6. Restart the network interface card. Type
   

   service network restart

   
7. Review the configuration. Type
   

   ifconfig

   . The IP Address has been changed permanently.
   

source - http://www.linglom.com/2008/04/20/how-to-change-ip-address-on-linux-redhat/