Saturday, July 3, 2010

Diagnosing Local Area Network

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Using netstat

Now if the card is active, we can check the status of our network with netstat command. This command shows routing tables, interface statistics, connections to outside networks and much more. Using a switch -nr we can see our routing tables. It uses three types of IP addresses, as shown below:


# netstat -nr

Kernel IP routing table

Destination Gateway Genmask Flags MSS Window irtt IFace

192.168.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo

0.0.0.0 192.168.0.114 0.0.0.0 UG 0 0 0 eth0



The details of the above output are described hereunder:



192.168.0.0 For this network no gateway is required as it is the current LAN.

127.0.0.0 This is also on same network; therefore it also does not require gateway address.

0.0.0.0 For all those IP addresses which are not specified in this routing table earlier, use the address


192.168.0.114 as the default gateway.

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