On Fri, 12 May 2017 05:02:37 +0000 "Kashyap, Saurav" <saurav.kash...@cavium.com> wrote:
> Hi, > > I am using upstream kernel 4.11.0 and base is RHEL 7.2. I am playing around > with TAP devices and created it using following commands > ======= > ip tuntap add tap10 mode tap > ip addr add 172.28.12.1/24 dev tap10 > ip link set tap10 up > ethtool -s tap10 msglvl 1 > ======= > > I enabled debug in driver and also added some prints in tun_net_xmit > function. I tried to ping using tap10 but I don’t see request reaching > driver. I also tried to create a bridge using brctl and link with physical > ethernet interface but it didn’t work. > > Second experiment I did was to create two tap device on same system and try > pinging one from another, that also didn’t worked. > I have following queries > 1) Is I am missing something? > 2) Is is possible to hook my own tx/rx to that tap device, so that data > packets actually goes on wire? > 3) Does DHCP works with tap devices? > > > Thanks, > ~Saurav > Don't you need an application reading/writing the tap device? The carrier state of tap device is up/down based on whether the corresponding tap device is open
