Configure network card

If the pc is network server, check if the ip_forward is enabled with the command:

cat > /proc/sys/net/ipv4/ip_forward

(0) mean not enabled, to enable open the file /etc/sysctl.conf and enable the line:

net.ipv4.ip_forward = 1

Enable the nat and masquerade in the iptables with this iptable rules:

iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
iptables -A FORWARD -i ppp0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o ppp0 -j ACCEPT

Ubuntu has gui network manager name NetworkManager that gets the ip from dhcp of router, the configuration files are in the /etc/NetworkManager directory, for more details read the man type in terminal:

man NetworkManager

The command line network manager files are in the /etc/network, to get the address form dhcp server open the file /etc/Network/interfaces and write these lines, replace the eth0 with the network card name:

# The loopback network interface
auto lo
iface lo inet loopback
# confgiure the eth0 for dhcp
auto eth0
iface eth0 inet dhcp

To list the network interfaces card names run the command:

ls /sys/class/net

For the static ip address add these lines to the file /etc/network/interfaces:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.1.10
gateway 192.168.1.1
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255

For these new settings to take effect you need to restart networking services using the following command:

sudo /etc/init.d/networking restart

Connecting with router to the internet

If the pc is connected with a wireless or other router, the pc is connecting to the outside internet through the router gateway, in this case your pc nameserver should be the router ip address witch in must cases it is 168.192.1.1, but in each new network connection or reboot of pc the file /etc/resolv.conf is override, to add the above nameserver to the /etc/resolv.conf, install the resolvconf package, witch will update the resolv.conf file in each network connection or reboot.
Add the nameserver to the /etc/resolvconf/resolv.conf.d/head file:

nameserver 192.168.1.1

Setting Your Hostname

The hostname command allows you to directly query, or set, the hostname from the command line.
You can see your current hostname with:

sudo /bin/hostname

To set the hostname directly you can become root and run:

sudo /bin/hostname newname

When your system boots it will automatically read the hostname from the file /etc/hostname.

mount network drives

Mount the network drives with NFS, samba and sshd to mount in a dir tmp:

sshfs 192.168.1.102:/root tmp
fusermount -u tmp (umount the dir)
mount -t ntfs 192.168.1.102:/home/user tmp

Connect with ssh:

ssh 192.168.1.102

To copy the files to [email protected]:/store/base directory, open the file dir and run the command:

scp * [email protected]:/store/base/

Configure network card.

Connecting with router to the internet

Setting Your Hostname

mount network drives