promisc Enable or disable the promiscuous mode of the interface.
arp Enable or disable the use of the ARP protocol on this interface. down This flag causes the driver for this interface to be shut down. It is implicitly specified if an address is assigned to the interface. up This flag causes the interface to be activated.
same net with address/netmask combination) all aliases are deleted, if you delete the first (primary). To delete an alias interface use ifconfig eth0:0 down.
You can use them to assign a second address. If your kernel supports alias inter‐ faces, you can specify them with eth0:0 for the first alias of eth0. This is usually a driver name followed by a unit number, for example eth0 for the first Ethernet interface. Option -a display all interfaces which are currently available, even if down -s display a short list (like netstat -i) -v be more verbose for some error conditions interface The name of the interface.
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