tap interface not coming up

问题:

I decided to add a tap interface and use it in my code , but I am able to get its state UP.

sudo ip -f link tuntap add tap10 mode tap sudo ip link set tap10 up 

After this when I do "ip link"

tap10: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 500 link/ether 26:cc:d2:b4:37:ea brd ff:ff:ff:ff:ff:ff 

state DOWN: How to get this state UP ? I am trying to send packets to it and nothing is received .

回答1:

It turns out that you need to have a proccess that uses your tap interface in order for it to be active.

This means that you need to write or use a program that connects to the interface file descriptor, then it will change its state to "RUNNING".

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