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Chapter 7Flag nameLOOPBACKPOINTTOPOINTRUNNINGNOARPPROMISCALLMULTIACTIVESIMPLEXSMARTLINK0 , LINK1 ,LINK2MULTICASTPPROMISCMONITORSTATICARPDEBUGDescriptionIndicates that this interface is a loopback interface.Indicates that this is a point-to-point (for example tunnel) interface.Indicates that the resources are allocated for this interface anddriver is running.Indicates that ARP is disabled on this interface(inet family specific).Indicates that the interface is in the promiscuous mode. In thismode, interface receives all packets, regardless of whether thepackets are destined for this host or not.Indicates that this interface receives all multicast traffic.Indicates that TX hardware queue is full.Indicates that the interface cannot hear its own transmissions.Indicates that this interface automatically manages its own routes.Per link layer defined attribute.Indicates that this interface supports multicast.Indicates that the user-requested promiscuous mode has beenenabled on this interface.Indicates that this interface is in monitor mode and does nottransmit anything on the wire. In this mode the interface dropspackets after being processed by bpf(4).Indicates that this interface only replies to requests from staticallydefined ARP entries and does not send any ARP request.Indicates that the debugging code is enabled and extra error logswill be displayed on the console.Besides the interface flags, there are also a few interface options (capabilities) that arespecific to the installed NIC hardware. A list of available NIC options can be foundin the following table:Option NameRXCSUMTXCSUMHWCSUMNETCONSVLAN_MTUVLAN_HWTAGGINGJUMBO_MTUDescriptionNIC can offload checksum on RXNIC can offload checksum on TXNIC can offload checksum on both TX and RXCan be used as network consoleVLAN-compatible MTU is supportedHardware VLAN tagging supportJumbo frames (9000 bytes MTU) are supported[ 103 ]