To temporarily configure an IP address, you can use the ifconfig command in the following manner. Just modify the IP address and subnet mask to match your network requirements.<\/p>\n
sudo ifconfig eth0 10.0.0.100 netmask 255.255.255.0<\/p>\n
To verify the IP address configuration of eth0, you can use the ifconfig command in the following manner.<\/p>\n
ifconfig eth0<\/p>\n
eth0 Link encap:Ethernet HWaddr 00:15:c5:4a:16:5a<\/p>\n
inet addr:10.0.0.100 Bcast:10.0.0.255 Mask:255.255.255.0<\/p>\n
inet6 addr: fe80::215:c5ff:fe4a:165a\/64 Scope:Link<\/p>\n
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1<\/p>\n
RX packets:466475604 errors:0 dropped:0 overruns:0 frame:0<\/p>\n
TX packets:403172654 errors:0 dropped:0 overruns:0 carrier:0<\/p>\n
collisions:0 txqueuelen:1000<\/p>\n
RX bytes:2574778386 (2.5 GB) TX bytes:1618367329 (1.6 GB)<\/p>\n
Interrupt:16<\/p>\n
To configure a default gateway, you can use the route command in the following manner. Modify the default gateway address to match your network requirements.<\/p>\n
sudo route add default gw 10.0.0.1 eth0<\/p>\n
To verify your default gateway configuration, you can use the route command in the following manner.<\/p>\n
route -n<\/p>\n
Kernel IP routing table<\/p>\n
Destination Gateway Genmask Flags Metric Ref Use Iface<\/p>\n
10.0.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0<\/p>\n
0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0 eth0<\/p>\n
If you require DNS for your temporary network configuration, you can add DNS server IP addresses in the file \/etc\/resolv.conf. The example below shows how to enter two DNS servers to \/etc\/resolv.conf, which should be changed to servers appropriate for your network. A more lengthy description of DNS client configuration is in a following section.<\/p>\n
nameserver 8.8.8.8<\/p>\n
nameserver 8.8.4.4<\/p>\n
If you no longer need this configuration and wish to purge all IP configuration from an interface, you can use the ip command with the flush option as shown below.<\/p>\n
ip addr flush eth0<\/p>\n
[Note]<\/p>\n
Flushing the IP configuration using the ip command does not clear the contents of \/etc\/resolv.conf. You must remove or modify those entries manually.<\/p>\n