Analysis of ifconfig output

Analysis of ifconfig output - Analysis of ifconfig output...

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Unformatted text preview: Analysis of ifconfig output Link encap:Ethernet -­‐ This denotes that the interface is an Ethernet related device. HWaddr -­‐ This is the hardware address or MAC address, which is unique to each manufactured Ethernet card. inet addr -­‐ indicates the machine IP address Bcast -­‐ denotes the broadcast address Mask -­‐ is the network mask which we passed using the netmask option (see above). UP -­‐ This flag indicates that the kernel modules related to the Ethernet interface has been loaded. BROADCAST -­‐ Denotes that the Ethernet device supports broadcasting -­‐ a necessary characteristic to obtain IP address via DHCP. RUNNING -­‐ The interface is ready to accept data. MULTICAST -­‐ This indicates that the Ethernet interface supports multicasting. Multicast allows a source to send a packet(s) to multiple machines as long as the machines are watching out for that packet. MTU -­‐ short form for Maximum Transmission Unit is the size of each packet received by the Ethernet card. The value of MTU for all Ethernet devices by default is set to 1500. Metric -­‐ This option can take a value of 0,1,2,3... with the lower the value the more leverage it has. The value of this property decides the priority of the device. Used if you have two Ethernet cards and you want to forcibly make your machine use one card over the other in sending the data. RX Packets, TX Packets -­‐ The next two lines show the total number of packets received and transmitted respectively. If you find errors or a dropped value greater than zero, then it could mean that the Ethernet device is failing or there is some congestion in your network. Collisions -­‐ The value of this field should ideally be 0. If it has a value greater than 0, it could mean that the packets are colliding while traversing your network -­‐ a sure sign of network congestion. Txqueuelen -­‐ This denotes the length of the transmit queue of the device. You usually set it to smaller values for slower devices with a high latency such as modem links and ISDN. RX Bytes, TX Bytes -­‐ These indicate the total amount of data that has passed through the Ethernet interface either way. As long as there is some network traffic being generated via the Ethernet device, both the RX and TX bytes will go on increasing. ...
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