IF-MIB - RFC 2863 - The Interfaces Group MIB
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Describes the network interfaces on the entity. For each interface the following information is given:

* ifType: The type of interface
* ifMtu: Size of the largest packet which can be sent/received on the interface
* ifSpeed: An estimate of the interface's current bandwidth
* ifPhysAddress: The interface's address at its protocol sub-layer. For 802.x interfaces, this is the MAC address
* The administrative and operational state of the interface
* The number of octets and packets sent and received on the interface